28-Day Weather Outlook Archives - Page 3 of 69

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted December 1, 2024

By Sig Silber December 1, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sun Dec 01 2024
Valid 12Z Sun Dec 01 2024 – 12Z Tue Dec 03 2024

…Heavy lake-effect snow starts to wind down over the Upper Great Lakes
later on Sunday…

…Heavy lake-effect snow continues downwind from Lake Erie through
Tuesday…

…Light to moderate snow over parts of the Northern Plains and
Upper/Middle Mississippi Valley and Central Appalachians on Sunday; on
Monday, light to moderate snow over parts of the Southern Ohio Valley…

…Temperatures will be 10 to 15 degrees below average over parts of the
Northern Plains to the Ohio Valley and the eastern third of the country...

High pressure over Central Canada will settle southeastward to the Middle
Mississippi Valley by Tuesday. The high pressure will also usher cold air
over parts of the Northern Plains to the Ohio Valley and across the
eastern third of the country, bringing temperatures of 10 to 15 degrees
below average. Freeze Warning will be over the Central/Eastern Gulf Coast
States.

The upper-level troughing over the Upper Midwest/Upper Great Lakes into
the Northeast will weaken Monday into Tuesday. The cold air streaming over
the Great Lakes will produce heavy lake-effect snow over the Upper
Peninsula of Michigan through Monday morning. Lighter snowfall will
develop over most of the west coast of the Lower Peninsula of Michigan.
However, heavy lake-effect snow will develop over the parts of the
northern Lower Peninsula of Michigan near the Traverse City to Gaylord
regions and will start to taper off on Monday into Tuesday. Moreover,
heavy lake-effect snow will continue downwind from Lakes Erie through
Tuesday. The heavy lake-effect snow will continue downwind of Lakes
Ontario on Sunday and taper off on Monday into Tuesday.

Moreover, upper-level energy will produce light to moderate snow over
parts of the Northern Plains and Upper/Middle Mississippi Valley on
Sunday. Furthermore, a wave of low pressure will create light to moderate
snow over parts of the Central Appalachians on Sunday. On Monday, a second
wave of low pressure will create light snow over parts of the Southern
Ohio Valley into the Tennessee Valley. A third wave of low pressure over
West-Central Canada will initiate light snow over parts of the Upper
Midwest by Tuesday morning.

Meanwhile, weak return flow off the Gulf of Mexico will create light rain
over parts of the Western Gulf Coast on Sunday and scattered showers and
thunderstorms on Monday. Elsewhere, upper-level ridging over parts of the
West Coast will create stagnant air conditions over the valley locations
from interior California into the Pacific Northwest, leading to areas of
dense fog and poor air quality.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 30, 2024

By Sig Silber November 30, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sat Nov 30 2024
Valid 12Z Sat Nov 30 2024 – 12Z Mon Dec 02 2024

…Heavy lake-effect snow downwind from the Great Lakes through Monday…

…Light to moderate snow from the Middle Mississippi Valley to the
Central Appalachians on Saturday…

…Light to moderate snow over parts of the Northern Plains/Upper
Mississippi Valley and Central Appalachians on Sunday…

…Temperatures will be 15 to 20 degrees below average over parts of the
Northern Plains and temperatures will be about 10 degrees below average
over parts of the eastern third of the country…

High pressure extending from Central Canada to the Tennessee Valley will
usher cold air over parts of the Northern Plains, bringing temperatures of
10 to 20 degrees below average. The cold air prompted Cold Weather
Advisories to be over parts of North Dakota on Saturday morning. The
Central Canada high will move south into the Northern Plains by Monday. As
the high pressure expands eastward, cold air will move over most of the
eastern third of the country, with temperatures about 10 degrees below
average. Freeze Warning will also be over the Central Gulf Coast States to
the Southeast.

In addition, upper-level troughing over the Upper Midwest/Upper Great
Lakes into the Northeast and cold air streaming over the Great Lakes will
produce heavy lake-effect snow over the Upper Peninsula of Michigan
through Monday. Lighter snowfall will develop over most of the west coast
of the Lower Peninsula of Michigan during the time period. However, heavy
lake-effect snow will develop over the parts of the northern Lower
Peninsula of Michigan near the Traverse City to Gaylord regions. Moreover,
heavy lake-effect snow will develop downwind of Lakes Erie and Ontario
through Monday.

Moreover, a quasi-stationary front extending from the Middle Mississippi
Valley to the Northern Rockies/Northern High Plains will remain through
Monday. Furthermore, a wave of low pressure will develop on the boundary
over parts of the Central Plains and move eastward to the Central
Appalachians by Sunday morning. The system will produce light to moderate
snow over parts of the Middle Mississippi Valley eastward to the Central
Appalachians on Saturday into Sunday morning. The light to moderate snow
will continue over the Central Appalachians on Sunday. Additionally, light
snow will develop over parts of the Northern Plains on Saturday. The light
snow will continue on Sunday and expand into parts of the Upper/Middle
Mississippi Valley.

Meanwhile, weak return flow off the Gulf of Mexico will create light rain
over parts of the Western Gulf Coast on Saturday into Monday morning.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 29, 2024

By Sig Silber November 29, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Fri Nov 29 2024
Valid 12Z Fri Nov 29 2024 – 12Z Sun Dec 01 2024

…Heavy lake-effect snow downwind from the Great Lakes through Sunday…

…Light snow over parts of the Central Appalachians on Friday and light
to moderate snow from the Middle Mississippi Valley to the Central
Appalachians on Saturday…

…Temperatures will be 15 to 25 degrees below average over parts of the
Northern Plains…

A slow-moving front across Florida will aid in creating showers and
thunderstorms over parts of the Central Gulf Coast to Florida on Friday.
After the boundary moves south of Florida, scattered light rain will
develop along the east coast of the Florida peninsula on Saturday. An area
of high pressure over Central Canada will usher cold air over parts of the
Northern Plains, bringing temperatures of 10 to 25 degrees below average.
The cold air has prompted Cold Weather Advisories over parts of North
Dakota on Friday morning.

In addition, upper-level troughing over the Great Lakes into the Northeast
and cold air streaming over the Great Lakes will produce heavy lake-effect
snow over the Upper Peninsula of Michigan through Sunday. Lighter snowfall
will develop over most of the west coast of the Lower Peninsula of
Michigan during the time period. However, heavy lake-effect snow will
develop over the parts of the northern Lower Peninsula of Michigan.
Moreover, heavy lake-effect snow will develop downwind of Lakes Erie and
Ontario through Sunday.

A quasi-stationary front extending from the Middle Mississippi Valley to
the Northern Rockies/Northern High Plains will be the focus for light snow
over parts of the Northern High Plains on Friday and over parts of the
Northern Plains on Saturday.

Furthermore, a wave of low pressure will develop on the boundary over
parts of the Central Plains and move eastward to the Central Appalachians
by Sunday. The system will produce light to moderate snow over parts of
the Middle Mississippi Valley eastward to the Central Appalachians on
Saturday into Sunday morning.

Meanwhile, weak return flow off the Gulf of Mexico will create light rain
over parts of the Western Gulf Coast on Saturday.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 28, 2024

By Sig Silber November 28, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
1105 PM EST Wed Nov 27 2024
Valid 12Z Thu Nov 28 2024 – 12Z Sat Nov 30 2024

…Thanksgiving Day storm to push into the Northeast today spreading
rainfall and New England snowfall in its vicinity…

…Increasingly below average temperatures spill out into the Great Plains
and Mississippi Valley through the end of the week…

…Lake Effect snows continue and will expand and intensify with time…

A dynamic mid-latitude cyclone tracks near the New England coast today.
Scattered showers and thunderstorms spread into the East Coast today. A
swath of moderate to heavy snowfall is likely to develop across portions
of the interior Northeast — winter storm watches and warnings are in
effect for portions of central New England related to the heavy snow
threat.

Elsewhere, Lake Effect snow showers across the Upper Great Lakes may yield
anywhere from 4-8 inches over the northern coastline of the Upper
Peninsula of Michigan as well as northern parts of the Lower Peninsula
today. A disturbance aloft will allow for the development of a new cold
front late today which moves east and south ahead of a strong and cold
surface high. In the wake of this front, as temperatures cool further,
lake effect snows should expand and intensify as they interact with record
warm Great Lakes temperatures for late November. Several additional inches
of snow are forecast on Friday bringing 2 day snowfall totals over a foot
with isolated higher amounts possible across downwind areas of the Great
Lakes by Saturday morning. Florida will remain mild to warm.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 27, 2024

By Sig Silber November 27, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Wed Nov 27 2024
Valid 12Z Wed Nov 27 2024 – 12Z Fri Nov 29 2024

…Pre Thanksgiving to Thanksgiving Day storm to push from the Mid
Mississippi/Ohio Valley today into the Northeast on Thursday…

…Dry conditions on tap for the West Coast after several days of wet
weather…

…Much above average temperatures from the Southern Plains into the Gulf
Coast today, while much below average temperatures spill out into the
Great Plains and Mississippi Valley through the end of the week…

A low pressure system responsible for heavy snowfall over the Colorado
Rockies (ending this morning) will intensify into a dynamic mid-latitude
cyclone, tracking through the Midwest and into the Northeast Coast through
Thanksgiving day. Scattered showers and thunderstorms will develop across
the Mid/Lower Mississippi Valley and Ohio/Tennessee Valleys this afternoon
before spreading into the East Coast tonight and progressively shifting
eastward through Thanksgiving day. A swath of light to moderate snowfall
is likely to develop across portions of the interior Northeast, with the
Northern Appalachians forecast to receive 4-8 inches of snow by Friday
morning.

Elsewhere, snow showers across the Upper Great Lakes may yield anywhere
from 4-8 inches over the northern coastline of the Upper Peninsula of
Michigan as well as northern parts of the Lower Peninsula. A dry spell
ensues across the West as an upper ridge slowly settles over the region.
Shortwave energy will phase with a northern stream trough and amplify
across the eastern half of the country in the coming days. This
development will allow for a cool continental airmass to spill out across
the Great Plains and Mississippi Valley through Thanksgiving day before a
reinforcing arctic airmass plunges temperatures even more through this
holiday weekend. Prior to that, today will be the last day of much above
average temperatures throughout the South. Much of Texas will experience
high temperatures between 15-25 degrees above average.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 26, 2024

By Sig Silber November 26, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Tue Nov 26 2024
Valid 12Z Tue Nov 26 2024 – 12Z Thu Nov 28 2024

…Heavy snow over parts of the Sierra Nevada Mountains, Great Lakes and
Central Rockies…

…Below average temperatures in the Plains…

A moderate level atmospheric river event will accompany a surface low
pressure system as it moves into the West today. This AR will spread
anomalous moisture over southern/central California, the Great Basin and
Central Rockies. Heavy coastal and mountain rain may lead to instances of
flash flooding, particularly over the windward foothills of the southern
Sierra Nevada below 8000 feet, where excessive rainfall may cause
land/rock/mudslides. Heavy snow accumulating between 1-3 feet are possible
over the higher elevations of the southern Sierra, as well as much of the
Intermountain West and Central Rockies today. Snow diminishes over the
Sierra on Wednesday while snow showers persist over the Colorado Rockies.
Snow showers continue across the Great Lakes this week with parts of the
Upper Peninsula of Michigan and downwind areas of Lake Ontario picking up
between 4-8 inches of snow by Thursday morning.

Troughing across the northern tier states will continue to promote below
average temperatures over the next several days. High temperatures in the
teens and 20s will represent a 15-25 degree departure from normal for much
of the far Northern Plains today and Wednesday. A pair of mid-level
disturbances are expected to phase over the Central U.S. and facilitate an
arctic outbreak across the region Wednesday night into Thanksgiving
Thursday.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 25, 2024

By Sig Silber November 25, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Mon Nov 25 2024
Valid 12Z Mon Nov 25 2024 – 12Z Wed Nov 27 2024

…Heavy snow over parts of the Sierra Nevada Mountains, Upper Great Lakes
and Central Rockies…

…Below average temperatures in the Northern Plains; above average temps
in the Southern Plains/Lower Mississippi Valley today...

An upper-level trough will swoop into the West Coast from the northeast
Pacific early this week. This trough will direct a very anomalous
subtropical moisture plume along its base at central and southern
California today and Tuesday. A surface low pressure system will help
focus the anomalous moisture over coastal areas as well as the Sierra
Nevada. Parts of the southern Sierra below about 8000 feet may experience
instances of Flash Flooding today. Rock/mud slides and general debris flow
are some of the possible impacts from excessive rainfall in mountainous
areas. Heavy snow is probable at the higher elevations of the southern
Sierra, where 3-4 feet are forecast to accumulate with isolated higher
amounts possible by Wednesday morning. The anomalous moisture feed is also
expected to penetrate into the interior of the West. Parts of the Great
Basin will experience snow showers while heavy snow blankets the
Intermountain West and Colorado Rockies with 1-2′ (isolated 3′) likely
over the next couple of days.

Elsewhere, a pair of low pressure systems moving through the Upper
Midwest/Great Lakes will generate several inches of snow over the Upper
Peninsula of Michigan, while snow showers occur across the greater Upper
Midwest and Lower Great Lakes. Temperatures will remain above average for
one last day from the Southern Plains into the Midwest before a strong
cold front pushes through on Tuesday. Some record high temperatures (in
the mid to upper 80s) might be set over south Texas today. Highs topping
out in the teens and 20s will represent a negative 20-30 degree departure
from normal for parts of the Northern Plains today. Mild conditions
continue over much of the East Coast through Tuesday.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 24, 2024

By Sig Silber November 24, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sun Nov 24 2024
Valid 12Z Sun Nov 24 2024 – 12Z Tue Nov 26 2024

…Heavy Snowfall for parts of the Sierra Nevada…

…Above average temperatures spread from the central U.S. into the East
while cold airmass descends into the Great Plains…

A weak low pressure system will continue directing a plume of moisture at
the West Coast over the next few days. This will likely result in coastal
and low elevation rain, while moderate to heavy snow proliferates across
the coastal ranges of Washington, Oregon and California. The heaviest
snowfall is likely to occur over portions of the Sierra Nevada, with the
southern Sierra poised to accumulate 2-3 feet with isolated higher
amounts. Snow showers will also impact the Colorado Rockies over the next
few days. Heavy rain and snow chances increase on Tuesday as another
atmospheric river event arrives across parts of central California.

Relatively zonal flow across the southern tier of the country will support
another day of above average temperatures for the Central/Southern U.S.
today. An upper trough will pickup steam over the northern tier and send a
strong cold front diving south through the Great Plains over the next 48
hours. Highs in the teens will represent 20-30 degree departures from
normal over the Northern High Plains through Monday. Temperatures will
drop precipitously, from highs in 60s and 70s today to 40s and 50s on
Monday over parts of the Southern Plains as the cold front propagates
through. The associated warm front will spread mild air across the Eastern
U.S. on Monday before the cold front arrives and drops temperatures for
the rest of the week.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 23, 2024

By Sig Silber November 23, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sat Nov 23 2024
Valid 12Z Sat Nov 23 2024 – 12Z Mon Nov 25 2024

…Very strong Atmospheric River to produce heavy snow across the Sierra
Nevada before winding down over north/central California today…

…Above average temperatures expand across the Central U.S. this
weekend…

Moisture associated with a highly impactful and dangerous atmospheric
river event will diminish as it sags south and east through central
California today. Heavy snow is likely over much of the Sierra Nevada this
morning where anywhere between 1-2 feet are expected to accumulate when
all said and done. Upslope portions of the Sierra below 7000 feet may
experience isolated instances of flash flooding this morning before snow
levels drop on the backside of the cold front pushing through the West
this afternoon. Snow showers spread into Northern/Central Rockies this
afternoon and the Intermountain West on Sunday. Snowfall totals of 6-12
inches are probable for the aforementioned areas by the end of the weekend.

Surface high pressure extending from central Canada down to the Gulf Coast
will support below average temperatures for those regions through tonight.
Parts of the Southeast will experience low temperatures in the mid to
upper 30s which may lead to some frost/freezes. A deepening upper trough
over the north-central U.S.and Ridge over Mexico will promote above
average temperatures across the Great Plains today and Sunday before
expanding into the East by Monday. Elsewhere, mixed precipitation can be
expected to continue across portions of upstate New York and New England
today.

To get your local forecast plus active alerts and warnings click HERE and enter your city, state or zip code.

Learn about wave patterns HERE.

Then, looking at the world and of course, the U.S. shows here also. Today we are looking at precipitation.

Please click on “Read More” below to access the full Daily Report issued today.

Weather Outlook for the U.S. for Today Through at Least 22 Days and a Six-Day Forecast for the World: posted November 22, 2024

By Sig Silber November 22, 2024weatherNo Comments

This article focuses on what we are paying attention to in the next 48 to 72 hours. The article also includes weather maps for longer-term U.S. outlooks (up to four weeks) and a six-day World weather outlook which can be very useful for travelers.

First the NWS Short Range Forecast. The afternoon NWS text update can be found here after about 4 p.m. New York time but it is unlikely to have changed very much from the morning update. The images in this article automatically update.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Fri Nov 22 2024
Valid 12Z Fri Nov 22 2024 – 12Z Sun Nov 24 2024

…Atmospheric river will produce one last round of heavy rain/mountain
snow and strong wind gusts across the Pacific Northwest today…

…Moderate to heavy snow for portions of the Central Appalachians today...

…Above average temperatures expand across the Central U.S. this
weekend…

Anomalous moisture supported by a deep low pressure system will continue
impacting the Pacific Northwest today. Life threatening flooding is likely
across portions of northern California, where additional amounts of 3-5″
are expected, mainly over coastal areas. As much as 4-10″ of rain are
possible for the northern Sierra Nevada. Dangerous flooding, rock slides
and debris flows remain likely today. A Moderate Risk of Flash Flooding is
in effect for upslope portions of the northern Sierra below 5000′. The
flooding risk will decrease from north to south by later today and into
tonight. Heavy mountain snow is expected over the Washington Cascades and
Northern Rockies through Saturday. Multiple feet of snow are likely to
accumulate over portions of the northern Sierra (above 7000′) by Saturday
evening. Strong winds will continue across coastal areas of northwest
California into western Washington, and over south-central Oregon. These
winds may blow down trees and power lines, and additional power outages
are possible.

A deep upper low will pivot over the Northeast and reinforce a cooler
airmass along with a relatively shallow bit of moisture into the region
today. Some rain and snow showers are expected across much of the
Northeast/northern Mid-Atlantic as a result. Heavier snow will likely
remain confined to the higher terrain of the Central Appalachians, where
between 6-12 inches are expected with locally higher amounts possible.
Snow chances diminish as the day progresses and temperatures rise. Upper
ridging over the Intermountain West and Rockies will shift eastward into
the Central U.S. this weekend where above average temperatures are likely
to follow.