136
FXUS01 KWBC 090826
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST MON DEC 09 2024
VALID 12Z MON DEC 09 2024 - 12Z WED DEC 11 2024
...HEAVY RAIN THREAT ACROSS THE CENTRAL TO EASTERN GULF COAST
REGION TODAY WILL EXPAND AND MOVE UP THE EAST COAST LATE TUESDAY
INTO WEDNESDAY MORNING...
...PERIODS OF MIXED RAIN AND SNOW LINGER ACROSS INTERIOR NEW
ENGLAND THROUGH TONIGHT...
...SNOW/BLIZZARD CONDITIONS ACROSS THE NORTHERN HIGH PLAINS WILL
GRADUALLY TAPER OFF LATER TODAY...
...STRONG SANTA ANA WINDS PROMPTING CRITICAL FIRE DANGER ACROSS
SOUTHERN CALIFORNIA...
...WELL ABOVE AVERAGE TEMPERATURES WILL OVERSPREAD THE CENTRAL AND
EASTERN U.S. AS COLD AIR SURGES INTO THE WESTERN AND THEN CENTRAL
U.S....
INCREASINGLY ACTIVE WEATHER WILL PROGRESS TOWARD THE EASTERN U.S.
THROUGH THE NEXT COUPLE OF DAYS AS A WEATHER PATTERN REVERSAL
CONTINUES TO UNFOLD ACROSS THE MAINLAND U.S. ONE OF THE
INGREDIENTS OF THIS PATTERN CHANGE IS MANIFESTED BY AN EXPANDING
AREA OF MODERATE TO HEAVY RAIN MOVING THROUGH THE OHIO AND
TENNESSEE VALLEYS THIS MORNING WITH EMBEDDED THUNDERSTORMS ACROSS
THE DEEP SOUTH. THE ASSOCIATED JET STREAM ALOFT WILL SEND THE
RAIN RAPIDLY NORTHEASTWARD ACROSS THE MID-ATLANTIC STATES TODAY,
REACHING INTO SOUTHERN NEW ENGLAND TONIGHT. TEMPERATURES WILL BE
COLD ENOUGH TO SUPPORT SNOW ACROSS NORTHERN NEW ENGLAND MONDAY
NIGHT INTO TUESDAY MORNING BEFORE TAPERING OFF FOR THE TIME-BEING
TUESDAY AFTERNOON. MEANWHILE, AN EXTENSIVE SURGE OF COLD AIR INTO
THE MID-SECTION OF THE COUNTRY WILL REINVIGORATE THE JET STREAM
ACROSS THE DEEP SOUTH ON TUESDAY, LEADING TO AN EXPANDING AREA OF
MODERATE TO LOCALLY HEAVY RAIN FROM THE GULF COAST INTO THE DEEP
SOUTH AND INTERIOR SOUTHEAST. TUESDAY NIGHT INTO WEDNESDAY
MORNING WILL LIKELY SEE THE RAIN QUICKLY EXPANDING UP THE
APPALACHIANS AND INTO THE INTERIOR SECTION OF THE MID-ATLANTIC,
AND THEN UP INTO NEW ENGLAND WITH SOME ICE POSSIBLE AT THE ONSET.
MEANWHILE, ORGANIZED LINES OF THUNDERSTORMS COULD FORM AHEAD OF A
POTENT COLD FRONT ACROSS THE INTERIOR SOUTHEAST EARLY ON WEDNESDAY
ALONG WITH SHARPLY COLDER TEMPERATURES AND BLUSTERY NORTHWESTERLY
WINDS BEHIND THE FRONT.
ACROSS THE NORTHERN HIGH PLAINS, COLDER AIR AND GALE FORCE WINDS
BEHIND A LOW PRESSURE SYSTEM HAVE PROMPTED WINTER WEATHER
ADVISORIES/WARNINGS, BLIZZARD WARNINGS, AS WELL AS WIND
ADVISORIES/HIGH WIND WARNINGS THIS MORNING. 4-7" OF SNOW IS
EXPECTED ACROSS THE NORTHERN HIGH PLAINS. MEANWHILE, STRONG
ONSHORE FLOW OFF LAKE SUPERIOR WILL FURTHER ENHANCE LOCAL SNOW
TOTALS ACROSS THE ARROWHEAD OF MN RANGE WHERE 9-12"+ TOTALS ARE
EXPECTED.
ON TUESDAY, A MORE INTENSE SURGE OF COLD AIR WILL BE FUNNELED
SOUTHWARD FROM ALASKA AND WESTERN CANADA INTO THE PLAINS
ASSOCIATED WITH AN INTENSIFYING ARCTIC HIGH PRESSURE SYSTEM. A
'BLUE NORTHER' COLD FRONT WILL BE DRIVING WELL THROUGH THE
SOUTHERN PLAINS INTO NORTHERN MEXICO BY TUESDAY NIGHT, DROPPING
TEMPERATURES INTO THE 30S INTO SOUTHERN TEXAS BY WEDNESDAY
MORNING. MEANWHILE, A REINFORCING COLD FRONT WILL DROP
TEMPERATURES BELOW ZERO DEGREES OVER THE NORTHERN PLAINS BY THEN.
HIGH TEMPERATURES WILL BE ABOUT 5-10 DEGREES BELOW NORMAL ACROSS
MUCH OF THE ROCKIES, SOUTHWEST AND EVENTUALLY INTO THE PLAINS.
ACROSS THE WESTERN U.S., A COLD SURGE DIRECTED THROUGH THE GREAT
BASIN INTO THE LOWER COLORADO RIVER VALLEY TODAY WILL BRING VERY
STRONG SANTA ANA WINDS INTO SOUTHERN CALIFORNIA BY LATER TODAY.
GIVEN DRY/LOW HUMIDITY CONDITIONS ALREADY IN PLACE, RED FLAG
WARNINGS HAVE BEEN ISSUED FOR THE EASTERN TRANSVERSE AND ALL OF
THE PENINSULAR RANGES; AS WELL AS A CRITICAL FIRE (LEVEL 2 OF 3)
FROM THE STORM PREDICTION CENTER. WINDS OF 35 TO 45 MPH IN THE
VALLEYS AND GUSTS OF 50 TO 65 MPH IN THE MOUNTAINS WILL HELP FAN
ANY FIRES THAT DO DEVELOP QUICKLY AND MAY REDUCE VISIBILITY WITH
BLOWING SMOKE AND DUST ADDING TO TRAVEL CONCERNS IN THE REGION.
KONG/GALLINA
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