930
FXUS01 KWBC 180729
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
229 AM EST SAT JAN 18 2025
VALID 12Z SAT JAN 18 2025 - 12Z MON JAN 20 2025
...WINTER STORM TO BRING MODERATE TO HEAVY SNOW TO THE
MID-ATLANTIC AND NORTHEAST SUNDAY...
...SNOW SHOWERS WITH MODERATE ACCUMULATIONS CONTINUE SATURDAY
THROUGH THE CENTRAL ROCKIES AND ADJACENT CENTRAL/SOUTHERN HIGH
PLAINS...
...ARCTIC FRONT BRINGS DANGEROUS COLD TO MUCH OF THE NATION THIS
WEEKEND...
MOISTURE LIFTING NORTHWARD AHEAD OF A STORM SYSTEM/COLD FRONT
PUSHING THROUGH THE EASTERN U.S. WILL BRING WINTRY PRECIPITATION
TO THE NORTH AND RAIN AND THUNDERSTORMS TO THE SOUTHEAST SATURDAY.
A LIGHT TO MODERATE WINTRY MIX IS EXPECTED TO MOVE FROM THE GREAT
LAKES INTO THE APPALACHIANS AND INTERIOR NORTHEAST, WITH MOSTLY
LIGHT RAIN SHOWERS ELSEWHERE IN THE OHIO VALLEY/SOUTHEAST AND
ALONG THE EAST COAST. AN ENHANCED FLOW OF GULF MOISTURE OVER
NORTHERN FLORIDA WILL BRING SOME MORE INTENSE SHOWERS AND
THUNDERSTORMS SATURDAY NIGHT WITH LOCALLY HEAVY RAINFALL AND THE
RISK FOR SOME ISOLATED FLASH FLOODING. A CHANGEOVER TO SNOW IS
EXPECTED SATURDAY NIGHT FOR THE OHIO/TENNESSEE VALLEYS FOLLOWING
COLD FRONTAL PASSAGE, THOUGH ACCUMULATIONS SHOULD GENERALLY REMAIN
LIGHT. THEN, AN UPPER-LEVEL SHORTWAVE TRAVERSING THE SOUTHERN U.S.
WILL HELP TO ENCOURAGE THE DEVELOPMENT/DEEPENING OF AN AREA OF LOW
PRESSURE AS IT MOVES OFF THE COAST OF THE MID-ATLANTIC. THIS WILL
LEAD TO AN ENHANCED SWATH OF SNOW TO THE NORTHWEST OF THE LOW
TRACK BEGINNING EARLY SUNDAY MORNING ACROSS THE APPALACHIANS AND
CONTINUING INTO THE DAY SUNDAY FROM THE NORTHERN MID-ATLANTIC TO
NEW ENGLAND. THE SWATH OF HEAVIEST SNOW (5-8"+) WILL LIKELY STAY
JUST TO THE NORTH AND WEST OF THE I-95 CORRIDOR. HOWEVER, 3-6" OF
SNOW WITH LOCALLY HIGHER AMOUNTS IS EXPECTED FROM NORTHERN
MARYLAND THROUGH BOSTON. LAKE-EFFECT SNOW WILL ALSO CONTINUE THIS
WEEKEND FOR FAVORABLE LOCATIONS DOWNWIND OF THE GREAT LAKES WITH
STRONG NORTHWESTERLY FLOW IN PLACE FOLLOWING THE FRONTAL PASSAGE.
ELSEWHERE, SNOW SHOWERS WILL CONTINUE FRIDAY FOR PORTIONS OF THE
ROCKIES AND ADJACENT CENTRAL/SOUTHERN HIGH PLAINS IN POST-FRONTAL
UPSLOPE FLOW. MODERATE TOTALS OF 3-6" ARE POSSIBLE IN VICINITY OF
THE RATON MESA. OTHERWISE, THE REST OF THE CENTRAL/WESTERN U.S.
WILL BE MOSTLY DRY THIS WEEKEND.
BESIDES THE IMPACTFUL WINTER WEATHER, DANGEROUSLY COLD
TEMPERATURES SPREADING ACROSS MUCH OF THE LOWER 48 THIS WEEKEND
AND INTO NEXT WEEK WILL BE THE OTHER BIG WEATHER STORY. ARCTIC AIR
WILL PLUNGE SOUTHWARD SATURDAY OVER THE ROCKIES, PLAINS, AND
MIDWEST FOLLOWING THE COLD FRONTAL PASSAGE, AND WILL REACH THE
EAST COAST SUNDAY NIGHT AS THE FRONT MOVES OFF INTO THE ATLANTIC.
FORECAST HIGHS BY SUNDAY RANGE FROM BELOW ZERO TO THE SINGLE
DIGITS IN THE NORTHERN PLAINS/UPPER MIDWEST, THE TEENS AND 20S
ACROSS THE CENTRAL PLAINS AND MIDWEST, THE 20S AND 30S FOR THE
SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY, AND THE 40S ALONG
THE WESTERN AND CENTRAL GULF COAST. THESE TEMPERATURES WILL SPREAD
TO THE EAST COAST FOR HIGHS MONDAY, JUST BEYOND THE FORECAST
PERIOD. DANGEROUSLY COLD WIND CHILLS OF 30-55 DEGREES BELOW ZERO
ARE EXPECTED ACROSS THE ROCKIES, NORTHERN PLAINS, AND UPPER
MIDWEST SUNDAY AND CONTINUING INTO NEXT WEEK. THIS WILL POSE A
LIFE-THREATENING RISK OF HYPOTHERMIA AND FROSTBITE TO EXPOSED
SKIN. WIND CHILLS BELOW ZERO WILL REACH AS FAR SOUTH AS OKLAHOMA
AND THE TENNESSEE VALLEYS. TEMPERATURES WILL REMAIN NEAR AVERAGE
WEST OF THE ROCKIES, WITH 30S AND 40S FOR THE INTERIOR
WEST/PACIFIC NORTHWEST, THE 50S AND 60S IN CALIFORNIA, AND THE 60S
AND 70S IN THE DESERT SOUTHWEST.
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