087
FXUS01 KWBC 130801
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SAT DEC 13 2025
VALID 12Z SAT DEC 13 2025 - 12Z MON DEC 15 2025
...RECORD WARMTH FOR MUCH OF THE WEST THIS WEEKEND, WHILE ARCTIC
AIR EXPANDS OVER EASTERN HALF OF THE COUNTRY...
...SWATH OF SNOW TO SPREAD FROM NORTHERN PLAINS TO MIDWEST TODAY,
THEN CENTRAL APPALACHIANS TO MID-ATLANTIC/NORTHEAST COAST
TONIGHT...
..LAKE EFFECT SNOW RETURNS THIS WEEKEND
...NEXT ROUND OF PRECIPITATION ARRIVES OVER PACIFIC NORTHWEST ON
SUNDAY...
BROAD UPPER-LEVEL RIDGING WILL CONTINUE RECORD WARM CONDITIONS
ACROSS MUCH OF THE WEST THIS WEEKEND. HIGH TEMPERATURES WILL BE
15-25 DEGREES ABOVE AVERAGE TODAY AND SUNDAY, WHILE CALIFORNIA'S
CENTRAL VALLEY EXPERIENCES HIGH TEMPERATURES IN THE 40S DUE TO
CLOUDS, WHICH WILL BE 10-20 DEGREES BELOW AVERAGE. SURFACE HIGH
PRESSURE WILL BUILD OVER THE CENTRAL AND EASTERN U.S. THIS
WEEKEND. AN ARCTIC AIRMASS WILL DESCEND OVER THE LOWER 48 VIA
NORTHERN/CENTRAL PLAINS AND UPPER/MIDDLE MISSISSIPPI VALLEYS TODAY
THEN EXPAND INTO THE MIDWEST, SOUTHERN PLAINS, LOWER MISSISSIPPI
VALLEY AND EAST COAST ON SUNDAY. SOME LOW MAXIMUM TEMPERATURE
RECORDS MAY BE BROKEN OVER THE UPPER MIDWEST/MICHIGAN TODAY WITH
HIGHS IN THE SINGLE DIGITS TO SUB-ZEROS. EXTREME COLD WARNINGS ARE
IN EFFECT FOR PORTIONS OF NORTHWESTERN MINNESOTA INTO NORTHEASTERN
NORTH DAKOTA THIS MORNING. LOW MAX TEMPERATURES MAY ALSO BE BROKEN
OVER THE MIDWEST ON SUNDAY, WHEN HIGHS IN THE TEENS WILL BE 20-30
DEGREES BELOW AVERAGE.
MID-LEVEL ENERGY MOVING THROUGH THE SOUTHERN PERIPHERY OF AN UPPER
LOW SPINNING ACROSS THE GREAT LAKES WILL GENERATE A FAST-HITTING
SWATH OF LIGHT TO MODERATE SNOWFALL FROM THE NORTHERN PLAINS TO
THE OHIO VALLEY TODAY. SNOW THEN MOVES INTO THE CENTRAL
APPALACHIANS AND MID-ATLANTIC/NORTHEAST COAST TONIGHT THROUGH
EARLY SUNDAY MORNING. WINTER STORM WARNINGS AND WINTER WEATHER
ADVISORIES ARE IN EFFECT FROM THE NORTHERN PLAINS TO MID-ATLANTIC
COAST.
A LOW PRESSURE SYSTEM WILL GENERATE SNOW SHOWERS ACROSS THE GREAT
LAKES TODAY FOLLOWED BY FRIGID NORTHWESTERLY FLOW ON THE BACKSIDE
OF THE COLD FRONT PRODUCING ADDITIONAL LAKE EFFECT SNOW THROUGH
THE REST OF THE WEEKEND. A RELATIVELY BRIEF PERIOD OF RESPITE FOR
THE PACIFIC NORTHWEST, FOLLOWING THE PERIOD OF HIGHLY IMPACTFUL
RAINFALL EARLIER IN THE WEEK, WILL COME TO AN END ON SUNDAY, WHEN
A DEEP LOW PRESSURE SYSTEM WILL BRING ANOTHER ROUND OF MOISTURE TO
THE REGION SUNDAY MORNING AND THEN A MORE SUBSTANTIAL PLUME LATE
SUNDAY NIGHT INTO MONDAY.
KEBEDE
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