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KF5JRV > WX 15.12.16 13:26l 64 Lines 3365 Bytes #999 (0) @ USA
BID : 7019_KF5JRV
Read: GUEST
Subj: NWS USA WX Forecast 12/15
Path: IW8PGT<CX2SA<N9PMO<NS2B<KF5JRV
Sent: 161215/1215Z 7019@KF5JRV.#NWAR.AR.USA.NA BPQ6.0.13
Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
248 AM EST Thu Dec 15 2016
Valid 12Z Thu Dec 15 2016 - 12Z Sat Dec 17 2016
...Strong storm system to bring potential for heavy rain and winter
precipitation to much of the country over the next few days...
...Arctic air and strong winds will create dangerous wind chills for some
areas from the northern plains to New England...
A strong Pacific storm system will continue to spread moisture and
precipitation from the West Coast into the Intermountain West and Rockies
through Friday. A relatively warm maritime air mass has overspread much of
the western U.S., with snow confined to the higher elevations from the
Sierras east to the Great Basin and central Rockies today. Farther north,
colder arctic air remains entrenched, and widespread snow is expected
today from the northern Intermountain West to the northern High Plains. On
Friday, snow levels will begin to lower across the Great Basin and the
central Rockies as the main upper-level trough begins to move inland.
Heavy snow is possible across a wide area including portions of the
northern Intermountain West, northern Rockies, and northern High Plains
today, with heavy snow possible for the central Rockies on Friday.
Additionally, heavy rain will be possible along the West Coast, from
southern Oregon southward through much of California. Strong and gusty
winds are also possible, especially at higher elevations.
Late Thursday night into Friday, the system will begin to spread
precipitation east across the central U.S. Snow will be possible on Friday
over a large area from the Rockies to the Great Lakes, with heavy snow
possible for some areas. Farther south, warmer air aloft overspreading the
shallow arctic air mass will result in the potential for sleet or freezing
rain from portions of the central plains to the mid-Mississippi valley. By
Friday night and Saturday morning, the system will continue to progress
eastward, spreading snow into the Northeastern U.S., with freezing rain
possible across portions of the Mid-Atlantic and Southeast, generally east
of the Appalachians. The low pressure system will also begin to draw
moisture from the Gulf of Mexico northward by Saturday, with showers and
thunderstorms possible from the lower Mississippi valley to portions of
the Southeast.
The other notable weather story during the short range forecast period
will be the frigid temperatures and wind chills across much of the
northern tier. An arctic air mass will be in place today across much of
the central and eastern U.S. in the wake of a cold front. Afternoon high
temperatures today are forecast to be 20 to 30 degrees below average from
the northern plains and Midwest to the Ohio and Tennessee valleys,
Mid-Atlantic, and Northeast. These cold temperatures will persist into
Friday, with only slight warming set to occur. An additional round of
arctic air will begin to move into the northern plains on Friday and into
the central U.S. on Saturday, with high temperatures as cold as 40 degrees
below average for some areas. Meanwhile, the eastern third of the nation
will warm quickly on Saturday as southerly flow ahead of the incoming
storm system draws warmer air northward.
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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