Weather Forecast: Today, Tonight, Tomorrow, Next Day, Five Days, and Intermediate-Term Outlooks for the U.S. and a Five-Day Forecast for the World: posted February 23, 2023

First, the 48-Hour Forecast (It is a 48 to 72 Hour Forecast actually)

Daily weather maps. I try to keep the below three maps updated. The Day 1 map updates twice a day and the Day 2 and 3 maps update only once a day. I will be doing the updating during the period described in the title of the article but if you happen to read this article later, you can get updates by clicking HERE

TODAY (or late in the day the evening/overnight map will appear)

TOMORROW

 NEXT DAY

This animation shows how things may play out over the next 60 hours. To update click here.

ATMOSPHERIC RIVERS

This tells us what is approaching the West Coast. Click HERE to update If I have not gotten around to doing the update.   Here is some useful information about Atmospheric Rivers.

Continuation of the NWS Short Range Forecast (It is updated by NWS twice a day and these updates can be found here. We post at least one of those updates daily, sometimes both. The Highlights are shown in the lede paragraph of this article.

The prolonged winter storm that yielded significant impacts from the West
through the Midwest and into the Great Lakes region with heavy snow,
strong winds and ice over the last few days is gradually winding down.
However, the tail end of this storm will be crossing the Northeast
overnight bringing with it one more round of snow and some freezing rain.
As much as 4 to 8 inches of additional snow is expected across especially
northern New England going through Friday evening before the system
finally begins to exit offshore. Gusty winds may create areas of blowing
and drifting snow. In the wake of this winter storm frigid temperatures
currently over the upper Midwest will move east across the Great Lakes and
into the Northeast by the start of the weekend. The cold temperatures will
not be quite as extreme as they have been in recent days, but expect
temperatures to drop well below normal, with overnight lows locally
dropping below zero. Milder air should begin to arrive by later in the
weekend with temperatures eventually warming to near or above normal.

Meanwhile, very active winter weather will continue across areas of the
West through the end of the week and the start of the weekend as a very
cold and slow-moving storm system drops south down along the West Coast
and gradually pivots into the Southwest this weekend. For tonight and
Friday, California in particular will be the dominant focus for the
greatest winter storm impacts. Multiple rounds of heavy snowfall coupled
with strong winds will lead to blizzard conditions over some of the higher
terrain and mountain passes, including the central and southern Sierra
Nevada, and the high terrain of Transverse Range in southern California.
This may lead to downed trees and power lines which will contribute to
power outage concerns. This storm system will be unusually cold, and snow
levels will be very low. In fact, areas very close to the Pacific Coast
and also into the interior valleys that are not accustomed to seeing snow,
may see some accumulating snowfall. Snowfall should accumulate to as much
as 3 to 5 feet for the Sierra Nevada, with locally heavier totals for the
highest peaks. Lesser amounts of 1 to 2 feet are forecast elsewhere across
portions of the Great Basin and into the Four Corners region as the storm
begins to pivot into the Southwest by this weekend.

While heavy snow and strong winds will tend to dominate the headlines for
this winter storm, one other major concern will be the threat of heavy
rainfall and flooding for some of the immediate coastal ranges of southern
California below the snow level. Several inches of rain are expected
locally, and this will drive locally significant runoff concerns. In fact,
the Weather Prediction Center has depicted a Moderate Risk of excessive
rainfall for portions of the Transverse Range.

Elsewhere, the record-warm temperatures seen across much of the East will
be tempered by the passage of a cold front this evening through Friday,
but many areas of the Mid-South, Southeast, and Gulf Coast will continue
to see above normal temperatures heading through the weekend.

Below is the current five-day cumulative forecast of precipitation (Updates can be found HERE)

Now we look at Intermediate-Term “Outlook” maps for three time periods. Days 6 – 10, Days 8 – 14, and Weeks 3 and 4.  An outlook differs from a forecast based on how NOAA uses these terms in that an “outlook” presents information as deviation from normal and the likelihood of these deviations.

Below are the links to obtain updates and additional information. They are particularly useful if you happen to be reading this article significantly later than when it was published. I always try to provide readers with the source of the information in my articles.

Temperature month to date can be found at https://hprcc.unl.edu/products/maps/acis/MonthTDeptUS.png

Precipitation month to date can be found at  https://hprcc.unl.edu/products/maps/acis /MonthPNormUS.png

Worldwide Tropical Forecast (This is a NOAA Product)