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KF5JRV > WX 05.03.17 14:26l 65 Lines 3202 Bytes #999 (0) @ USA
BID : 11705_KF5JRV
Read: GUEST
Subj: NWS USA WX Forecast 3/5
Path: IW8PGT<CX2SA<N6RME<I0OJJ<N9PMO<NS2B<KF5JRV
Sent: 170305/1305Z 11705@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
257 AM EST Sun Mar 05 2017
Valid 12Z Sun Mar 05 2017 - 12Z Tue Mar 07 2017
...Heavy snow possible over the Cascades, Sierras, and the Intermountain
West...
...Well above normal temperatures for the Central and Northern Plains...
...Heavy rains expected to wane across Southeastern Texas today...
A cold front that moved across the Pacific Northwest and portions of the
Intermountain West yesterday will progress southeast across southern
California and toward the Rockies today. Continued onshore flow behind the
front will lead to a prolonged period of moderate to heavy snow,
especially in the higher elevations. Rain and thunderstorms can also be
expected along much of the Pacific Coast, aided by yet another area of low
pressure grazing the Pacific Northwest throughout the day. Winter Storm
Warnings are currently in effect for much of northern California and the
Sierra Nevada Mountain range through Monday, where accumulations of 3 to 4
feet are possible above 5,000 feet. Winter Weather Advisories are also in
effect for portions of the Intermountain West and Pacific Northwest for
continued heavy snow today.
While the cold front is pushing across the Intermountain West, west to
southwesterly flow sweeping off the Continental Divide will lead to a
continued warming and drying trend across much of the Central and Northern
Plains. Temperatures will soar to as much as 20 to 30 degrees above normal
once more today, continuing the springlike thermal seesaw. Meanwhile,
strong high pressure will protect the eastern U.S. in the form of a cold
air wedge east of the Appalachians. This will lead to below normal
temperatures into Monday for this area, before warmer air slowly erodes
the wedge.
On the southwestern edge of this high pressure, strong return flow is
present, resulting in a deep layer of warm and moist air across southern
Texas and the Lower Mississippi Valley. A disturbance aloft is
interacting with this moist and unstable airmass, sparking showers and
thunderstorms across southern and eastern Texas. These will spread
eastward into the Lower Mississippi Valley today, and then northward up
the Mississippi Valley and into the Upper Great Lakes during the day
Monday. Heavy rain will continue to be a concern along the Gulf Of Mexico
in Texas through this morning, waning by the afternoon.
Looking ahead to Monday and Tuesday...a merger of two low pressure systems
will take place across the Northern Plains on Monday. The new system will
gain strength quickly as it pushes across the Upper Mississippi Valley and
into Canada Monday night into Tuesday. From this system will extend a
strong cold front, expected to sweep across the Mississippi River Valley
and Southern Plains Tuesday. A deep pull of Gulf moisture will take place
ahead of this system (an extension of the warm surge already taking place
across Texas and the Lower Mississippi Valley today), leading to
widespread showers and thunderstorms across much of the Eastern U.S.
Monday night through Tuesday.
Wix
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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