weather

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

…Heavy snow likely for portions of the Lower Great Lakes and interior
Northeast…

…A wet weekend ahead for the East and West Coasts…

…Significant Winter Storm likely across the Northern Plains and into the
Upper Midwest late this weekend into early next week…

A developing low pressure system will produce snow showers across parts of
the Midwest and Upper Great Lakes today. This same system will shift into
the Ohio Valley this evening and dump a swath of heavy snow from downwind
areas of Lake Ontario into much of central/northern New England. Snowfall
totals of 6-12 inches are expected by Sunday morning for those areas.

A second system will track across the Gulf Coast and dump showers and
thunderstorms over the Southeast and into the Mid-Atlantic today/tonight.
Heavy rainfall within scattered to isolated thunderstorms will spread
across the Carolina coast and up the Mid-Atlantic to Northeast urban
corridor where 1-3 inches of rainfall are possible with isolated higher
amounts. A Slight Risk of Excessive Rainfall leading to Flash Flooding
(level 2/4) is in effect from southern Maryland and the DC Metro area up
the coast through Philly, NYC and into Boston’s metro on Saturday.

A third system in the Gulf of Mexico will propagate toward the Straits of
Florida where it will stall out later today. Anomalous moisture from the
subtropical Pacific will join with moisture from the Gulf of Mexico to
produce heavy to Excessive Rainfall as well as strong to severe
thunderstorms over extreme southern portions of Florida this afternoon and
evening. Thus, Slight Risks of Excessive Rainfall (level 2/4) and Severe
Thunderstorms (level 2/5) are in effect for this area.

Elsewhere, a deep low pressure system will bring unsettled weather to the
West this weekend. Heavy rain is likely to focus over coastal areas of
northern California into southern Oregon, while heavy snow develops over
the northern/central Sierra and Shasta Siskiyous. Anywhere between 2-4
feet of snow are likely for those areas with isolated higher amounts
possible. This system will weaken as it moves inland and spreads snow
showers across the Rockies on Saturday. By Sunday, this system will begin
to redevelop over the Front Range into a significant Winter Storm.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Thu Mar 21 2024
Valid 12Z Thu Mar 21 2024 – 12Z Sat Mar 23 2024

…Gusty winds and snow showers linger across Maine today as the next
winter storm approaches northern New England by Saturday…

…Swath of light to moderate snow spreads from the northern Plains to the
Great Lakes by Friday; strong winter storm expected this weekend…

…Thunderstorms and heavy rain return to the Gulf Coast today before
unsettled weather shifts to the Southeast and Mid-Atlantic…

Winter is set to make a strong return over the next several days across
the Northern Tier as multiple rounds of potentially heavy snow impact
parts of the Nation. A potent storm system rapidly strengthening over
eastern Maine is already producing locally heavy snow throughout The Pine
Tree State. Additional periods of snow can be expected through this
evening, as well as gusty winds associated with the developing tight
pressure gradient. The March (weather) madness is forecast to continue by
late Friday into Saturday as the next winter storm approaches the Interior
Northeast and New England. Snowfall probabilities for at least 8 inches of
snow are high (greater than 70%) throughout northern Vermont, New
Hampshire, and much of interior Maine. Additionally, there exists modest
probabilities (50-70%) for over a foot of snow in these regions. Residents
and visitors are advised to remain weather aware and plan ahead if
traveling between Friday night and Saturday in this part of the country
due to the possibility of treacherous travel.

Snow is also anticipated to produce impacts from the northern Rockies and
northern Plains to the Great Lakes, with two systems impacting the region.
The first system is currently spreading light to moderate snow from
northeast Montana to the Dakotas and is expected to expand into the Upper
Midwest and Great Lakes by Friday. Outside of the higher terrain of
northwest Montana, the heaviest amounts are expected to stretch from
southeast North Dakota and northeast South Dakota towards southern
Wisconsin and central Michigan. More specifically, probabilities for at
least 4 inches of snow are highest throughout parts of Wisconsin and
Michigan. However, snowfall accumulation could be limited to grassy
surfaces due to the increasing March sun angle and snow falling during the
daylight hours. In case this round of snow wasn’t enough, a separate
system is forecast right on the heels of the first and expected to begin
spreading snowfall throughout the Northern Plains on Saturday. This storm
will be a part of a larger upper level trough entering the West Coast on
Friday and spreading precipitation inland. Heavy snow is likely throughout
the Sierra and high elevations of the Intermountain West, central and
northern Rockies. Additional heavy snow and winter weather impacts will
continue into early next week across much of the northern Plains.

More spring-like weather is forecast throughout the Gulf Coast today as
showers and thunderstorms develop along a forming frontal boundary over
the Texas coastline as well as underneath an upper low over the southern
Plains. A few storms could turn severe across parts of Texas and southwest
Louisiana. The Storm Prediction Center has issued a Slight Risk (level
2/5) of severe thunderstorms across southeast Texas in order to highlight
the potential for large hail, strong wind gusts, and isolated tornadoes.
Additionally, heavy rain could lead to isolated flooding concerns for
parts of the southern Plains and western Gulf Coast today. This system and
associated storminess are forecast to slide east on Friday towards the
Southeast and southern Florida. The greatest impacts are expected across
South Florida, where a few storms could become severe and heavy rain could
lead to urban flooding impacts. A Slight Risk (level 2/4) of Excessive
Rainfall has been issued for the Gold Coast. By Saturday, moisture surging
northward along a frontal boundary is expected to provide focus for heavy
rain along the Mid-Atlantic and Northeast coastline, with the potential
for flash flooding where heavier rainfall occurs.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Wed Mar 20 2024
Valid 12Z Wed Mar 20 2024 – 12Z Fri Mar 22 2024

…Snow showers and gusty winds forecast throughout the Northeast over the
next few days…

…Light to moderate snow spreads from the northern Plains to the Great
Lakes by Friday…

…Shower and thunderstorm chances return to the Southern Plains and Gulf
Coast…

A rapidly deepening low pressure system maturing over eastern Maine early
Thursday is anticipated to produce periods of snow across the Interior
Northeast and New England, while also reinforcing lake effect snow showers
in its wake. High probabilities (80-90%) for at least 4 inches of snow
exist across much of northern and central Maine, with lower probabilities
extending into northern Vermont, New Hampshire, and Upstate New York.
Gusty westerly winds up to 50 mph are also possible across parts of
Vermont and Maine on Thursday as the potent storm system creates a tight
pressure gradient over the Northeast. Additionally, the cold and dry
airmass in place combined with gusty winds will create fire weather danger
throughout the Mid-Atlantic. Red Flag Warnings have been issued across
much of Virginia.

A separate winter storm is anticipated to produce a swath of snow between
the northern Plains and Great Lakes by the end of the week, with snow
beginning today across the northern High Plains. A wave of low pressure
developing over a lingering stationary front will help trigger the
developing precipitation shield and shift snowfall eastward by Thursday
night. High probabilities for at least 4 inches of snow exist across
northwest Montana, with medium to high probabilities (40-80%) extending
from north-central Montana to central Minnesota, including southern South
Dakota. Greater chances for moderate to heavy snow shifts to the Upper
Midwest and Great Lakes by Friday, where there is the potential for up to
10-12 inches of snow. Residents should remain weather aware and up to date
with the latest forecast as uncertainty remains regarding the exact
location of heavy snowbands.

Elsewhere, unsettled weather is set to return to the southern Plains, Gulf
Coast, and parts of the West Coast. An upper low lingering over the
Southwest is expected to finally eject into the southern Plains tonight
and spark showers and thunderstorm over portions of Oklahoma and Texas. By
Thursday, rain could become heavy enough along the western Gulf Coast and
southeast Texas to produce isolated flooding concerns. This system is
forecast to progress eastward into the Gulf of Mexico on Friday, spreading
showers and thunderstorms along the entire Gulf Coast, as well as
eventually Florida and the Southeast by late Friday. However, both the
severe and flooding threat associated with this system remain marginal.
For the West Coast, light to moderate rain is expected to move inland
across northern California and the coastal Midwest on Friday. As the axis
of precipitation along a frontal boundary intersects the Sierra on Friday
night, heavy snow is possible throughout the mountainous terrain.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sun Mar 17 2024
Valid 12Z Sun Mar 17 2024 – 12Z Tue Mar 19 2024

…Locally heavy snow continues across the Southern Rockies today, while
lake effect snow impacts the Great Lakes region through early this week…

…Strong cold front ushers in frost/freeze potential throughout the
Southeast by Tuesday…

…Scattered showers and thunderstorms forecast across the Gulf Coast
States this St. Patrick’s Day…

Even as the Spring Equinox approaches this Tuesday, winter weather
continues to impact parts of the Nation with localized heavy snow. The
same closed upper low that has lingered over the Southwest over the last
few days is expected to continue producing areas of heavy mountain snow
throughout the Southern Rockies and Four Corners region today before the
system weakens and precipitation becomes widely scattered. The heaviest
remaining snow is expected over the mountainous terrain of New Mexico,
which could lead to treacherous travel at times. Meanwhile, a potent low
pressure system crossing from southern Ontario to southern Quebec, Canada
today will aid in lake effect snow downwind of the Great Lakes through
early this week. The cold airmass advecting from the northwest across the
relatively warm lakes will allow for numerous snow showers and localized
areas of moderate to heavy snow. Specifically, the U.P. of Michigan and
Tug Hill Plateau of western New York could see several inches of
accumulation snow. Snowfall chances also extend to upslope portions of the
central Appalachians on Monday and Tuesday.

As a cold front pushes south and clears the Southeast by Monday, much
colder temperatures and high pressure will build in its wake. Low
temperatures are forecast to dip into the 20s and 30s from the Midwest to
the Tennessee Valley on Monday, prior to this cold sinking into the
Mid-South and Southeast on Tuesday. Vegetation in these regions are
susceptible to frost/freeze damage given the relatively mild late winter
temperatures, thus any unprotected sensitive plants could be damaged or
killed. Meanwhile, warm temperatures will remain locked in place over the
Pacific Northwest, where highs into the low 70s are forecast and
anticipated to spread into the northern High Plains by Monday.

One more day of shower and thunderstorm activity is expected today along
the Gulf Coast as a lingering frontal boundary focuses rainfall chances.
Heavy rain could lead to flooding concerns from southeast Texas to
southern Louisiana due to saturated soils from recent rainfall. A Slight
Risk (level 2 of 4) of Excessive Rainfall is in effect. A few isolated
severe thunderstorms could also impact the immediate Gulf Coast region as
well this St. Patrick’s Day.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Sat Mar 16 2024
Valid 12Z Sat Mar 16 2024 – 12Z Mon Mar 18 2024

…Heavy mountain snow impacts the Four Corners and Southern Rockies this
weekend…

…Severe thunderstorms and heavy rain possible across southern Texas and
along the Gulf Coast…

…Mild weather continues across the Pacific Northwest and East Coast…

The lingering closed upper low located over the Desert Southwest is
forecast to remain mostly stationary this weekend and produce the
continued threat of heavy mountain snow from the Four Corners region to
the Southern Rockies. In particular, the high terrain of central/southern
Utah as well as the San Juan and Sangre de Cristo Mountains of Colorado
and New Mexico can expect treacherous conditions due to heavy snow.
Additional snowfall accumulations over a foot are expected for parts of
the Southern Rockies through Monday, with Winter Storm Warnings and Winter
Weather Advisories remaining in effect.

Meanwhile, a stalling cold front extending from the Southeast to southern
Texas will lead to at least a few more days of storminess for the Lone
Star State and remaining Gulf Coast region. The greatest severe weather
threat exists today across south-central Texas and the Middle Texas Coast,
where the Storm Prediction Center has highlighted a Slight Risk (level 2
of 5) for severe thunderstorms. Large hail, damaging winds, and isolated
tornadoes are possible within the strongest storms. Intense rainfall rates
falling over saturated ground may also lead to flash flooding and standing
water in urban areas throughout similar portions of Texas and stretching
into far southwest Louisiana. By Sunday, shower and thunderstorm activity
is expected to stretch along most of the Gulf Coast, with isolated to
scattered chances for severe weather and flash flooding. Given recent
rainfall, parts of southwest Louisiana and southeast Texas have been
designated as having a Slight Risk (level 2 of 4) for Excessive Rainfall.

The other notable system to impact the CONUS through early next week is
forecast to clip the Great Lakes and northern New England, producing
mostly light rain and snow showers as well as gusty winds and cooler
temperatures. Locally heavy snow is possible downwind of the Great Lakes
on Sunday and Monday. Before the chilly and below average airmass
progresses into the eastern third of the Nation on Monday, mild afternoon
temperatures into the 60s and 70s can be expected this weekend in the
East. More importantly, the cold airmass on the way will contain a morning
frost/freeze threat on Monday throughout the Midwest and Ohio Valley as
lows dip into the 20s and 30s.

Upper riding anchored over the Northwest will continue the warm and dry
pattern throughout the Pacific Northwest and northern Great Basin,
expanding into the northern High Plains on Monday. Highs into the 60s and
70s are forecast, which could break a few daily high temperature records.

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
Fri Mar 15 2024
Valid 12Z Fri Mar 15 2024 – 12Z Sun Mar 17 2024

…Heavy mountain snow continues throughout the Four Corners region into
this weekend…

…Severe thunderstorm and excessive rainfall chances shift south into the
Southeast and Gulf Coast States…

…Mild weather continues across the Pacific Northwest and East Coast…

A meandering closed upper low spinning over the Desert Southwest will
continue to funnel moisture northward into the Four Corners region and
create additional chances for heavy mountain snow through the weekend.
Snow chances will diminish today across the central/southern High Plains
as upslope flow weakens, but mountainous terrain of the central and
southern Rockies can expect an additional 1 to 2 feet of snow through
Sunday. The higher elevations of southern Utah and Arizona can also expect
snowfall accumulations over a foot, which will create hazardous driving
conditions. Winter Storm Warnings and Winter Weather Advisories remain in
effect for these regions.

Farther east, waves of low pressure and an associated cold front are
forecast to slide south and east today while stretching from the
Mid-Atlantic to the Southern Plains. Heavy rain and scattered
thunderstorms will accompany this system, with the greatest chances for
severe weather and/or flash flooding located across parts of the Mid-South
and south-central Texas. For these areas, thunderstorms could be strong
enough to contain damaging wind gusts and isolated tornadoes. Meanwhile,
the primary risk across south-central Texas is expected to be associated
with large hail and scattered flash flooding. By this weekend, the
aforementioned frontal boundary is forecast to stall along the Gulf Coast
and southern Texas, resulting in additional chances for heavy rain that
could lead to scattered flooding concerns from south-central Texas to
southern Mississippi.

The other notable weather system to impact the Lower 48 will be a potent
low pressure system passing to the north of the Great Lakes on Saturday
and nearing Maine on Sunday. The greatest impacts are anticipated to be
associated with gusty winds across the Great Lakes and decreasing
temperatures throughout the Upper Midwest by Sunday. Additionally, periods
of lake effect snow could be locally heavy across the U.P. of Michigan
downwind of Lake Superior. Otherwise, strong southerly flow on the eastern
side of this system will keep much of the East Coast mild with high
temperatures mainly in the 60s and 70s. The other warm spots over the next
few days include the Pacific Northwest and Southeast, where a few daily
record highs are possible. Parts of western Washington and Oregon may see
highs into the mid-70s, while mid-to-upper 80s are found throughout the
Sunshine State.