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KF5JRV > WX 13.12.16 14:24l 57 Lines 2939 Bytes #999 (0) @ USA
BID : 6907_KF5JRV
Read: GUEST
Subj: NWS USA WX Forecast 12/13
Path: IW8PGT<CX2SA<N9PMO<NS2B<KF5JRV
Sent: 161213/1215Z 6907@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
255 AM EST Tue Dec 13 2016
Valid 12Z Tue Dec 13 2016 - 12Z Thu Dec 15 2016
...Arctic air mass poised to overspread much of the north central and
northeastern U.S...
...Pacific storm system to bring a prolonged period of potentially heavy
rain and snow to the western U.S...
A frontal system will move from the Mississippi valley to the Appalachians
today, bringing areas of snow to the Great Lakes, Ohio valley, and
portions of the Mid-Atlantic and Northeast. Farther south, another
lingering frontal system will keep showers and a few thunderstorms
possible across the southeastern U.S. through early Wednesday morning.
Across the northern plains, a cold air mass already in place today will be
reinforced by the arrival of a fast-moving arctic frontal boundary on
Wednesday. High temperatures today and Wednesday are expected to be 20 to
30 degrees below average from the northern plains to the Upper Midwest. On
Thursday, the front will quickly move into the eastern U.S., high
temperatures expected to be 15 to 30 degrees below average across the Ohio
valley as well as portions of the Mid-Atlantic and Northeast. The passage
of the front will also bring renewed lake-effect snow activity downwind of
the Great Lakes by Wednesday and Thursday.
The West will start off relatively quiet in terms of weather today. A few
scattered snow showers are possible along a lingering frontal boundary
from the Pacific Northwest to the northern Rockies. By this afternoon,
however, a Pacific low pressure system accompanied by an expansive plume
of moisture will begin to approach the coast, spreading rain and mountain
snow into northern California. Precipitation will continue to expand
across the West Tuesday night into Wednesday, spreading into much of the
Great Basin, Pacific Northwest, and northern Intermountain West, where
colder air already in place will allow precipitation to fall as snow.
Warmer air will gradually push into the region as the low pressure system
approaches, raising snow levels Wednesday night and Thursday. The rapid
progression of the warm front northward could also result in areas of
sleet or freezing rain at lower elevations where cold air could remain
trapped. The potential exists for significant snow accumulations across
portions of the Great Basin, northern Intermountain West, and Pacific
Northwest, along with some ice accumulations in valleys. Additionally,
flooding rains are possible across much of central and northern
California. The threat for heavy precipitation is expected to persist into
Thursday as multiple waves of low pressure move along the frontal boundary
into the West Coast. Please refer to products issued by your local NWS
forecast office for further details specific to your area.
Ryan
Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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