767
FXUS01 KWBC 120324
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1023 PM EST THU DEC 11 2025
VALID 12Z FRI DEC 12 2025 - 12Z 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
THROUGH SATURDAY...
...STRIPE OF ACCUMULATING SNOW TO SPREAD FROM NORTHERN PLAINS TO
MIDDLE MISSISSIPPI VALLEY TODAY, THEN FROM MIDWEST TO CENTRAL
APPALACHIANS ON SATURDAY...
..LAKE EFFECT SNOW RE-INVIGORATES ON SATURDAY AND SUNDAY
WHILE, DRIER WEATHER BEGINS ACROSS THE PACIFIC NORTHWEST 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-TO-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 TODAY 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
TODAY 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.
A LARGE AREA OF MODERATE TO HEAVY SNOWS WILL SPREAD FROM THE
NORTHERN PLAINS, SOUTHEASTWARD INTO THE MIDDLE MISSISSIPPI VALLEY
ON FRIDAY, ASSOCIATED WITH THE AFOREMENTIONED ARCTIC AIR OUTBREAK.
THIS SNOW, DRIVEN BY A MID-LEVEL DISTURBANCE WILL CONTINUE EAST
INTO THE MID-WEST AND CENTRAL APPALACHIANS ON SATURDAY.
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 WEDNESDAY AND THURSDAY, WILL DIMINISH TODAY.
HOWEVER, LAKE EFFECT SNOWS WILL LIKELY BE RE-INVIGORATED LATE
SATURDAY INTO SUNDAY AS NORTHWESTERLY WINDS ALONG WITH THE
UPSTREAM ARCTIC AIRMASS PUSH BACK ACROSS THE GREAT LAKES.
KEBEDE/ORAVEC
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