483
FXUS01 KWBC 171948
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
248 PM EST FRI NOV 17 2023
VALID 00Z SAT NOV 18 2023 - 00Z MON NOV 20 2023
..UNSETTLED WEATHER EXPANDS ACROSS THE WEST
..GREAT PLAINS WARMS UP WHILE THE WEST COOLS DOWN
A SOUTHERN STREAM TROUGH WILL PHASE WITH ITS NORTHERN STREAM
COUNTERPART AS IT ENTERS THE WEST FROM THE PACIFIC THIS WEEKEND.
THIS AMPLIFYING MID-LEVEL TROUGH WILL SUPPORT WIDESPREAD RAIN
SHOWERS AND HIGH ELEVATION SNOW ACROSS MUCH OF THE WEST. SCATTERED
SHOWERS AND THUNDERSTORMS WILL EXPAND ACROSS THE STATE OF
CALIFORNIA TONIGHT WHILE HEAVY SNOW DEVELOPS OVER THE SIERRA
NEVADA. THE FOCUS FOR RAIN AND SNOW EXPANDS INTO THE PACIFIC
NORTHWEST ON SATURDAY AS A DEEP LOW PRESSURE SYSTEM EMERGES OVER
THE REGION. THERE IS UP TO A 40% CHANCE OF 8" OF SNOW FALLING OVER
PARTS OF THE SIERRA THAT DAY. THE CASCADES WILL RECEIVE MUCH OF
ITS SNOW BETWEEN SATURDAY AND SUNDAY WITH ESTIMATES AT AROUND
6-12" FOR THE MOUNTAIN RANGE BY MONDAY MORNING. MUCH OF THE
MOISTURE ASSOCIATED WITH THIS SYSTEM WILL SPREAD INTO THE
INTERMOUNTAIN WEST AND ROCKIES ON SUNDAY WHERE ADDITIONAL SNOW
WILL OCCUR.
PARTS OF THE NORTHEAST COAST WILL EXPERIENCE NEAR-TO-RECORD
BREAKING WARM LOW TEMPERATURES TONIGHT, AS CLOUDY CONDITIONS
PREVENT SURFACES FROM RADIATING WARM DAYTIME TEMPERATURES OUT. THE
SOUTHWEST WILL ALSO EXPERIENCE WARM LOW TEMPERATURES TONIGHT,
BEFORE A COOL AIRMASS MOVES IN ON SATURDAY. TEMPERATURES CLIMB
OVER THE GREAT PLAINS BENEATH AN AREA OF HIGH PRESSURE AND OUT
AHEAD OF AN APPROACHING MID-LEVEL TROUGH. SCATTERED SHOWERS AND
THUNDERSTORMS WILL PROLIFERATE ACROSS THE SOUTHERN/CENTRAL PLAINS
AND MIDDLE/LOWER MISSISSIPPI VALLEY ON SUNDAY, WHILE THE WESTERN
TROUGH DIGS INTO THE ROCKIES.
KEBEDE
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