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KF5JRV > WX 22.04.21 14:15l 87 Lines 4069 Bytes #999 (0) @ USBBS
BID : 13985_KF5JRV
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Subj: NWS USA WX Forecast - Apr 22
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Sent: 210422/1052Z 13985@KF5JRV.#NWAR.AR.USA.NA BPQ6.0.20
Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
420 AM EDT Thu Apr 22 2021
Valid 12Z Thu Apr 22 2021 - 12Z Sat Apr 24 2021
...Snow lingers over northern Maine into Friday as another shot of cold
air and snow moves into the northern Rockies and High Plains...
...Record cold temperatures today across the central to eastern U.S. will
moderate on Friday...
...A complex low pressure system will begin to bring a threat of heavy
rain and severe thunderstorms across the Deep South on Friday...
...Fire weather threat increasing across the Desert Southwest to the
southern High Plains...
The intensifying low pressure system that recently brought wet snow across
the Ohio Valley to the interior Northeast is beginning to move into
southeastern Canada. However, its forward motion is being slowed down by a
blocky weather pattern across much of Canada. The system will continue to
intensify over the Canadian Maritimes today as it rotates snow back toward
northern Maine where a foot of accumulation is still possible near the
Canadian border. The circulation of the low will also expand in size as
it pulls more cold air across the Great Lakes and down into the East
Coast. In fact, some lake-enhanced snow is expected today downwind of the
Great Lakes. Winds will remain strong and gusty across much of the
Northeast into the Mid-Atlantic today and they will be slow to subside on
Friday.
A large dome of unseasonably cold air will expand eastward into much of
the eastern U.S. under a large area of high pressure centered over the
Mid-Mississippi Valley. Freeze Warnings and Frost Advisories remain in
effect across multiple states from the central Plains eastward to the
Appalachians and northern Mid-Atlantic where numerous daily record low
temperatures are forecast to be tied or broken. By Friday, the cold
airmass will moderate as it drifts east, although low temperatures will
still be around 10 degrees below normal in the Central U.S., with lows
hovering in the mid-30's to 40's.
In the western U.S., a low pressure system will bring lingering light snow
across the central Rockies for the next few days as another dome of cold
air from western Canada is poised to surge into the northern Rockies/High
Plains. Temperatures will once again tumble, along with a quick burst of
snow, as the associated cold front passes through much of Montana by this
evening. The higher elevations will once again receive the heaviest
snowfall amounts, with 6 to 12 inches possible. The snow should then move
further south into Wyoming by Friday morning where 3 to 4 inches, with up
to 6 in the mountains, is forecast.
Meanwhile, little improvement of fire weather conditions is in store for
the Desert Southwest where Critical fire weather risk is in place over the
region. The main area of concern will be from far eastern Arizona through
New Mexico and into the Texas Panhandle. A deepening low pressure system
will couple with dry conditions to promote Critical risk of fire weather
across the region into Saturday. Moreover, portions of northern Plains
and interior Northwest should be on the alert for elevated to critical
fire weather risk today.
Attention will turn to the southern Plains Friday morning as a complex
frontal low pressure system develops over the area. Widespread showers
and thunderstorms are likely as a warm front lifts north. The unstable
airmass will promote the development of heavy rain and severe
thunderstorms which will likely expand eastward across the Deep South late
Friday into early Saturday. Accordingly, a Slight risk of excessive
rainfall and severe weather have been issued by the Weather Prediction
Center and Storm Prediction Center, respectively.
Last but not least, precipitation associated with a deepening upper low is
forecast to reach the Pacific Northwest and northern California Friday
night.
Kong/Asherman
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
73, Scott KF5JRV
Pmail: KF5JRV @ KF5JRV.#NWAR.AR.USA.NA
Email: KF5JRV@GMAIL.com
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