605
FXUS01 KWBC 021833
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
132 PM EST SAT DEC 02 2023
VALID 00Z SUN DEC 03 2023 - 00Z TUE DEC 05 2023
...A MULTI-DAY ATMOSPHERIC RIVER EVENT WILL CONTINUE TO IMPACT THE
NORTHWEST WITH HEAVY RAIN AND SIGNIFICANT MOUNTAIN SNOWFALL THIS
WEEKEND...
...UNSETTLED WEATHER FORECAST ACROSS THE EASTERN THIRD OF THE
COUNTRY WITH HEAVY RAIN POTENTIAL ALONG THE GULF COAST AND
SOUTHEAST; WINTRY WEATHER IS EXPECTED FROM PARTS OF THE MIDWEST
AND GREAT LAKES TO NORTHERN NEW ENGLAND...
...GENERALLY MILDER THAN NORMAL TEMPERATURES EXPECTED FOR ACROSS
MOST OF THE LOWER 48...
THE ONGOING ATMOSPHERIC RIVER EVENT IN THE NORTHWEST IS EXPECTED
TO CONTINUE THROUGH THE REST OF THE WEEKEND AND INTO EARLY NEXT
WEEK. WAVES OF SHORTWAVE ENERGY AND ASSOCIATED SURFACE LOW
PRESSURE SYSTEMS WILL CONTINUE TO BRING A PLUME OF ANOMALOUS
PACIFIC MOISTURE INTO THE PACIFIC NORTHWEST AND NORTHERN ROCKIES
THIS WEEKEND. LOWER SNOW LEVELS WILL ALLOW FOR HEAVY SNOWFALL
ACROSS THE CASCADES THROUGH SUNDAY. THERE IS A HIGH CHANCE (>90%)
OF AT LEAST 24" OF TOTAL SNOWFALL FOR CASCADE PASSES, INCLUDING
I-90. SNOW LEVELS RISE ABOVE 4000 FEET TONIGHT WHICH WILL END THE
HEAVY SNOW THREAT OVER THE PASSES. TRAVEL WILL BE DIFFICULT AND
HAZARDOUS. INCREASING WIND WITH PERIODS OF OF HEAVY SNOW WILL
PRODUCE AREAS OF BLOWING SNOW OVER THE HIGHER TERRAIN OF THE
NORTHERN ROCKIES. THERE IS A HIGH CHANCE (>70%) OF 1-3 FEET OF
SNOW IN THE HIGHER TERRAIN THROUGH SUNDAY.
HEAVY RAIN AT THE LOWER ELEVATIONS OF THE PACIFIC NORTHWEST MAY
CAUSE FLASH FLOODING ISSUES. SEVERAL ISSUES OF RAINFALL ALONG THE
PACIFIC NORTHWEST COASTLINE AND INLAND AREAS WILL SUPPORT A SLIGHT
RISK (AT LEAST 15%) OF EXCESSIVE RAINFALL LEADING TO FLASH
FLOODING BY SUNDAY. THERE IS A MARGINAL RISK IN EFFECT FOR MUCH OF
WESTERN/COASTAL OREGON AND PARTS OF THE SOUTHERN CASCADES FOR
TONIGHT. SEVERAL INCHES OF RAIN IN THE LOWLANDS AND THE RISING
SNOW LEVELS TONIGHT INTO SUNDAY WILL LIKELY PRODUCE MINOR TO
MODERATE RIVER FLOODING LATE THIS WEEKEND INTO NEXT WEEK IN
WESTERN WA/OR. THE MOISTURE PLUME REDIRECTS NORTHWARD OVER
WASHINGTON STATE BY EARLY THIS COMING WEEK.
SHOWERS AND SCATTERED THUNDERSTORMS SPREAD FROM THE SOUTHEAST
THROUGH THE MID-ATLANTIC AND INTO THE NORTHEAST THROUGH SUNDAY. A
TRAILING LOW PRESSURE SYSTEM WILL GENERATE RAIN/SNOW SHOWERS
ACROSS THE UPPER GREAT LAKES/MIDWEST AND OHIO VALLEY. HEAVY SNOW
WILL DEVELOP OVER NORTHERN NEW ENGLAND SUNDAY AFTERNOON INTO
EVENING AND CONTINUE THROUGH MONDAY. THE HEAVIEST SNOW WILL OCCUR
OVER NORTHERN VERMONT/NEW HAMPSHIRE THROUGH INLAND MAINE.
WIDESPREAD RECORD WARM LOW TEMPERATURES WILL LIKELY BE REALIZED
OVER MUCH OF THE SOUTHEAST AND MID-ATLANTIC TONIGHT AS CLOUDS AND
RAINFALL WORK TO KEEP TEMPERATURES FROM FALLING MUCH FROM THEIR
DAYTIME HIGHS. MUCH OF THE REST OF THE COUNTRY WILL WARM UP
HEADING INTO THE WORK WEEK.
KEBEDE
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