310
FXUS01 KWBC 210806
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SUN JAN 21 2024
VALID 12Z SUN JAN 21 2024 - 12Z TUE JAN 23 2024
...HEAVY PRECIPITATION MOVING ACROSS CALIFORNIA TODAY AND AGAIN ON
MONDAY...
...HEAVY RAIN EXPECTED TO DEVELOP OVER SOUTHERN TEXAS LATER TODAY,
SHIFTING EAST INTO EASTERN TEXAS AND LOUISIANA ON MONDAY...
...FREEZING RAIN AND SLEET TO IMPACT OKLAHOMA AND KANSAS THIS
EVENING, SPREADING INTO THE MIDWEST ON MONDAY, FOLLOWING BY WET
SNOW ACROSS THE UPPER MIDWEST AND INTO THE GREAT LAKES BY TUESDAY
MORNING...
SUNDAY MORNING WILL BEGIN WITH A DEEP FREEZE ENGULFING MUCH OF THE
EASTERN TWO-THIRDS OF THE COUNTRY UNDER THE DOMINANCE OF A LARGE
DOME OF ARCTIC AIR PRESSURE. SUB-FREEZING TEMPERATURES WILL REACH
AS FAR SOUTH AS CENTRAL TEXAS AND NORTHERN FLORIDA WHILE SUB-ZERO
TEMPERATURES WILL BE FOUND ACROSS THE UPPER MIDWEST. THE
EXPANSIVE AREA OF HIGH PRESSURE WILL THEN SLIDE EASTWARD TO REACH
THE EAST COAST ON MONDAY. WITH NO ADDITIONAL REPLENISHMENT OF
ARCTIC AIR FROM CANADA, A STEADY WARM-UP IS IN STORE FOR THE
MID-SECTION OF THE COUNTRY. DEEP RETURN FLOW BEHIND THE HIGH
PRESSURE SYSTEM WILL BEGIN TO SET UP A CHANNEL OF MOISTURE FROM
THE GULF OF MEXICO INTO THE SOUTHERN PLAINS LATER TODAY INTO
MONDAY. THE CHANCE OF HEAVY RAIN IS EXPECTED TO INCREASE QUICKLY
ACROSS SOUTHERN TEXAS THIS EVENING AND CONTINUE INTO MONDAY.
MEANWHILE, THE PRESENCE OF ARCTIC AIR FARTHER NORTH WILL SUPPORT
MIXED PRECIPITATION, SLEET AND ICE AS THE MOISTURE REACHES INTO
OKLAHOMA AND KANSAS TONIGHT. THE MOISTURE WILL CONTINUE TO SURGE
NORTHEASTWARD INTO THE MIDWEST ON MONDAY, OVERRUNNING THE ARCTIC
AIR AND RESULTING IN FREEZING RAIN/SLEET. BY MONDAY NIGHT INTO
EARLY TUESDAY, AN UPPER-LEVEL TROUGH EXITING THE SOUTHERN ROCKIES
WILL INTERACT WITH A FRONT TO BRING AN EXPANDING AREA OF SNOW INTO
THE UPPER MIDWEST INTO LOWER MICHIGAN TOWARD THE LOWER GREAT
LAKES. MEANWHILE, LAKE-EFFECT SNOW THIS MORNING DOWNWIND FROM THE
GREAT LAKES WILL GRADUALLY TAPER OFF LATER TODAY, AS WILL THE
UPSLOPE SNOW OVER PORTIONS OF THE CENTRAL APPALACHIANS.
ALONG THE WEST COAST, MULTIPLE FRONTAL SYSTEMS ARRIVING FROM THE
PACIFIC WILL BRING MORE ACTIVE WEATHER ONSHORE THROUGH THE NEXT
COUPLE OF DAYS. HEAVY RAIN WILL LIKELY CONTINUE ACROSS NORTHERN
CALIFORNIA TODAY, FOLLOWED BY A BRIEF LULL THIS EVENING BEFORE THE
NEXT SURGE OF HEAVY RAIN EXPECTED TO ARRIVE ON MONDAY. MEANWHILE,
HEAVY WET SNOW IS EXPECTED ALONG THE SIERRA NEVADA DURING SIMILAR
TIME FRAME. IN ADDITION, THE INFLUX OF WARMER AIR
OVERRUNNING THE TRAPPED COLD AIR NEAR THE GROUND WILL CONTINUE TO
BRING THE POTENTIAL OF ICE/FREEZING RAIN FOR THE COLUMBIA GORGE
FOR THE NEXT COUPLE OF DAYS. MIXED PRECIPITATION WILL BEGIN TO
PENETRATE FURTHER INLAND ACROSS THE FOUR CORNERS BY MONDAY NIGHT
INTO TUESDAY MORNING WITH THE PASSAGE OF AN UPPER-LEVEL TROUGH AS
PRECIPITATION TAPERS OFF IN CALIFORNIA. UNSETTLED WEATHER WILL
ALSO CONTINUE ALONG THE COAST OF THE PACIFIC NORTHWEST.
KONG
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