804
FXUS01 KWBC 111921
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
220 PM EST THU DEC 11 2025
VALID 00Z FRI DEC 12 2025 - 00Z SUN DEC 14 2025
...DRIER WEATHER FOR THE PACIFIC NORTHWEST BUT FLOODING EFFECTS TO
CONTINUE...
...RECORD WARMTH ACROSS PORTIONS OF THE WEST, WHILE ARCTIC AIR
SURGES SOUTH INTO THE NORTHERN PLAINS AND UPPER MISSISSIPPI VALLEY
FRIDAY AND SATURDAY...
...A NARROW BAND OF MODERATE TO HEAVY SNOWS LIKELY FROM THE
MID-WEST, UPPER OHIO VALLEY INTO THE CENTRAL APPALACHIANS TONIGHT,
FOLLOWED BY A SECOND STRIPE OF ACCUMULATING SNOWS FRIDAY FROM THE
NORTHERN PLAINS SOUTHEASTWARD INTO THE MIDDLE MISSISSIPPI VALLEY...
...ONGOING LAKE EFFECT SNOWS DIMINISH THURSDAY NIGHT BUT ARE
RE-INVIGORATED LATE SATURDAY INTO SUNDAY...
PRECIPITATION CONTINUES TO DIMINISH THURSDAY ACROSS THE PACIFIC
NORTHWEST AS THE ATMOSPHERIC RIVER THAT HAS PRODUCED 5 TO 10+
INCHES OF RAIN HAS COME TO AN END. WHILE DRIER WEATHER LOOKS TO
BE IN STORE FOR THIS AREA OF THE COUNTRY THROUGH THE UPCOMING
WEEKEND, THE MAJOR TO CATASTROPHIC FLOODING EFFECTS ARE LIKELY TO
CONTINUE FOR SEVERAL DAYS ACROSS PORTIONS OF WESTERN WASHINGTON
STATE AND NORTHWESTERN OREGON.
THE CESSATION OF THE PACIFIC NORTHWEST HEAVY RAINS ARE IN RESPONSE
TO THE CONTINUED AMPLIFICATION OF THE LARGE SCALE FLOW ACROSS
NORTH AMERICA, CHARACTERIZED BY A BUILDING MID TOP UPPER LEVEL
RIDGE ACROSS THE WEST AND A BROAD DEEP UPPER LOW OVER THE MIDDLE
TO EASTERN PORTIONS OF THE U.S. THIS AMPLIFIED PATTERN WILL
PRODUCE BIG TEMPERATURE CONTRASTS FROM WEST TO EAST ACROSS THE
LOWER 48 GOING INTO THIS WEEKEND. MUCH ABOVE AVERAGE TEMPERATURES
ARE FORECAST FROM THE WEST COAST, THROUGH THE SOUTHWEST, GREAT
BASIN, ROCKIES AND INTO THE SOUTHERN PLAINS. THE EXCEPTION
CONTINUES TO BE IN THE CENTRAL CALIFORNIA VALLEY WHERE LOW CLOUDS
AND FOG ARE EXPECTED TO REMAIN STUCK, KEEPING TEMPERATURES MUCH
COOLER THAN SURROUNDING CLOUD FREE AREAS. BOTH RECORD HIGH
AFTERNOON TEMPERATURES AND RECORD HIGH MORNING LOW TEMPERATURES
ARE POSSIBLE IN LOCATIONS FROM THE SOUTHWEST, PORTIONS OF SOUTHERN
AND NORTHERN CALIFORNIA AND THE GREAT BASIN FRIDAY AND SATURDAY.
IN CONTRAST MUCH COLDER TEMPERATURES ARE IN STORE ACROSS THE NORTH
CENTRAL TO NORTHEASTERN TIER OF THE NATION OVER THE NEXT FEW DAYS.
THE COLDEST TEMPERATURES WILL BE ACROSS THE NORTHERN PLAINS,
UPPER MISSISSIPPI VALLEY, MID-WEST REGION WHERE ARCTIC AIR WILL BE
PUSHING SOUTHEAST FOR THE END OF THE WEEK INTO THIS WEEKEND.
AFTERNOON HIGH TEMPERATURES WILL BE 20 TO 30 DEGREES BELOW AVERAGE
ON FRIDAY AND SATURDAY OVER THE NORTHERN PLAINS, SPREADING INTO
THE UPPER MISSISSIPPI VALLEY ON SATURDAY. A FEW RECORD LOW
AFTERNOON HIGHS POSSIBLE SATURDAY OVER THE NORTHERN PLAINS/UPPER
MISSISSIPPI VALLEY REGION, WITH MORE WIDESPREAD RECORD LOW
AFTERNOON TEMPERATURES POSSIBLE SUNDAY ACROSS THE OHIO AND
TENNESSEE VALLEY REGIONS.
PRECEDING THE SOUTHEAST PUSH OF THE ARCTIC AIR, A NARROW BAND OF
MODERATE TO HEAVY SNOW IS POSSIBLE FROM THE MID-WEST INTO THE
UPPER OHIO VALLEY AND CENTRAL APPALACHIANS THURSDAY AFTERNOON INTO
THURSDAY NIGHT IN ASSOCIATION WITH A FAST MOVING AREA OF LOW
PRESSURE MOVING WEST TO EAST FROM THE CENTRAL PLAINS INTO THE OHIO
VALLEY AND CENTRAL TO SOUTHERN APPALACHIANS. THIS WILL BE
FOLLOWED BY A LARGER AREA OF MODERATE TO HEAVY SNOWS FRIDAY FROM
THE NORTHERN PLAINS, SOUTHEASTWARD INTO THE MIDDLE MISSISSIPPI
VALLEY ASSOCIATED WITH THE AFOREMENTIONED ARCTIC AIR OUTBREAK.
IN THE LEE OF THE GREAT LAKES, THE ONGOING ACTIVE LAKE EFFECT
SNOWS SHOWERS, ASSOCIATED WITH THE INITIAL AREA OF COLD AIR TO
SWEEP OVER THE LAKES YESTERDAY AND TODAY, WILL BEGIN TO DIMINISH
THIS EVENING. HOWEVER, LAKE EFFECT SNOWS WILL LIKELY BE
RE-INVIGORATED LATE SATURDAY INTO SUNDAY AS THE UPSTREAM ARCTIC
AIRMASS PUSHES BACK ACROSS THE GREAT LAKES.
ORAVEC
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