289
FXUS01 KWBC 211959
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
258 PM EST TUE JAN 21 2025
VALID 00Z WED JAN 22 2025 - 00Z FRI JAN 24 2025
...DANGEROUSLY COLD TEMPERATURES AND WIND CHILL VALUES WILL LINGER
FOR MUCH OF THE SOUTH AND EASTERN U.S....
...DANGEROUSLY COLD TEMPERATURES AND WIND CHILL VALUES WILL LINGER
FOR MUCH OF THE SOUTH AND EASTERN U.S....
...RARE WINTER STORM TO BRING HEAVY SNOW, SLEET, AND FREEZING RAIN
TO THE GULF COAST AND SOUTHEAST, WITH WIDESPREAD TRAVEL IMPACTS
EXPECTED...
...MODERATE TO HEAVY LAKE-EFFECT SNOW DOWNWIND FROM THE GREAT
LAKES...
...THERE IS AN EXTREME RISK OF FIRE WEATHER OVER PARTS OF SOUTHERN
CALIFORNIA...
BITTERLY COLD HIGH PRESSURE EXTENDING FROM THE OHIO VALLEY TO THE
SOUTHERN PLAINS BRINGS TEMPERATURES 25 TO 30 DEGREES BELOW AVERAGE
FROM PARTS OF THE MID-ATLANTIC TO THE CENTRAL GULF COAST. THE
ARCTIC AIR MASS WILL CREATE WIDESPREAD SUB-FREEZING OVERNIGHT LOWS
ALONG THE GULF COAST AND THROUGHOUT THE SOUTHEAST. THE COLD
WEATHER WILL EXACERBATE POWER OUTAGES.
THE ARCTIC AIR ENCOMPASSING THE EASTERN TWO-THIRDS OF THE UNITED
STATES WILL PERSIST WITH ONLY A SLOW RETURN TO NORMAL TEMPERATURES
LATER IN THE WEEK. MULTIPLE RECORD LOW TEMPERATURES ARE POSSIBLE
THROUGH MID-WEEK, ESPECIALLY ACROSS THE GULF COAST AND PORTIONS OF
THE SOUTHEAST. THE RECORD LOW TEMPERATURES WILL ALSO INCLUDE
RECORD COLD AFTERNOON HIGH TEMPERATURES. IN ADDITION, 30 TO 50
DEGREES BELOW ZERO WIND CHILLS DEVELOP ACROSS PORTIONS OF THE
DAKOTAS AND THE UPPER MIDWEST. THE 30 TO 50 DEGREES BELOW ZERO
WIND CHILLS POSE AN EXTREME RISK OF HYPOTHERMIA AND FROSTBITE TO
EXPOSED SKIN. THE SUB-ZERO WIND CHILLS WILL CONTINUE FROM THE
CENTRAL PLAINS EASTWARD ACROSS THE OHIO VALLEY, INCLUDING THE
NORTHERN MID-ATLANTIC, AND NORTHEAST THROUGH WEDNESDAY NIGHT.
MOREOVER, ALONG WITH THE COLD AIR, A SIGNIFICANT WINTER STORM
CONTINUES TO UNFOLD WITH RAPIDLY DETERIORATING TRAVEL CONDITIONS
ACROSS PORTIONS OF THE GULF COAST. IMPACTFUL WINTER WEATHER,
INCLUDING HEAVY SNOW, SLEET, AND FREEZING RAIN, WILL CONTINUE TO
SPREAD EASTWARD FROM PARTS OF THE FLORIDA PANHANDLE THROUGH THE
EASTERN CAROLINAS. ON TUESDAY EVENING, THE SNOWFALL WILL BE
TAPERING OFF FROM EASTERN TEXAS THROUGH THE WESTERN FLORIDA
PANHANDLE. MAJOR HIGHWAY AND AIR TRAFFIC DISRUPTIONS, INCLUDING
POSSIBLE ROAD CLOSURES AND FLIGHT CANCELLATIONS, MAY CONTINUE FOR
SEVERAL DAYS EVEN AFTER THE SNOWFALL ENDS. SIGNIFICANT IMPACTS ON
TRAVEL ARE EXPECTED, WITH LOCALIZED POWER OUTAGES AND TREE DAMAGE
LIKELY IN AREAS WITH THE HEAVIEST ICING. FROM TUESDAY EVENING INTO
WEDNESDAY, 0.10 INCHES OF FREEZING RAIN WILL DEVELOP ACROSS
NORTHEASTERN FLORIDA AND SOUTHEASTERN GEORGIA.
MEANWHILE, ON WEDNESDAY, A CLIPPER SYSTEM WILL MOVE ACROSS THE
UPPER GREAT LAKES INTO EASTERN CANADA BY THURSDAY. THE COLD AIR
AND UPPER-LEVEL ENERGY WILL PRODUCE LAKE-EFFECT SNOW DOWNWIND FROM
THE GREAT LAKES. AS THE FRONT PASSES, LAKE-EFFECT SNOW WILL BECOME
MORE MODERATE TO HEAVY LAKE-ENHANCED SNOW THROUGH THURSDAY.
FURTHERMORE, INTENSE HIGH PRESSURE OVER PARTS OF THE NORTHERN
INTERMOUNTAIN REGION AND GREAT BASIN WILL SET UP SANTA ANA WINDS
OVER SOUTHERN CALIFORNIA. THEREFORE, THE SPC HAS ISSUED AN EXTREME
RISK OF FIRE WEATHER OVER PARTS OF SOUTHERN CALIFORNIA. WINDS OF
20 TO 40 MPH, WITH STRONGER WINDS IN THE TERRAIN, LOW RELATIVE
HUMIDITY, AND DRY FUELS HAVE CONTRIBUTED TO THE DANGEROUS
CONDITIONS.
ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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