268
FXUS01 KWBC 190812
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SUN NOV 19 2023
VALID 12Z SUN NOV 19 2023 - 12Z TUE NOV 21 2023
...UNSETTLED WEATHER EXPANDS ACROSS THE WESTERN U.S. WITH STRONG
WINDS, HIGH-ELEVATION SNOWS, AND COASTAL/LOWER-ELEVATION RAINS...
...LOW PRESSURE SYSTEM DEVELOPING OVER THE CENTRAL HIGH PLAINS
WILL BRING AN EXPANDING AREA OF SHOWERS AND THUNDERSTORMS ACROSS
THE CENTRAL U.S. TOWARDS THE EASTERN U.S....
...ABOVE AVERAGE TEMPERATURES FOR THE SOUTH AND THE NORTHERN
PLAINS WHILE COLDER AIR SURGES ACROSS THE WESTERN U.S....
A VIGOROUS UPPER-LEVEL TROUGH CURRENTLY HURLING ONSHORE INTO THE
WEST COAST WILL SEND A WAVE OF INCLEMENT WEATHER RAPIDLY FROM WEST
TO EAST ACROSS THE COUNTRY THROUGH THE NEXT COUPLE OF DAYS. THE
PACIFIC NORTHWEST IS FIRST IN LINE TO FEEL THE IMPACTS FROM THIS
WEATHER SYSTEM INCLUDING COASTAL/LOWER ELEVATION RAINS, HIGH
ELEVATION SNOW, AND THE ONSET OF STRONG GUSTY WINDS TODAY. THESE
WEATHER CONDITIONS ARE EXPECTED TO PENETRATE QUITE RAPIDLY INLAND
TODAY BEHIND A DYNAMIC COLD FRONT, OVERSPREADING MUCH OF THE
INTERMOUNTAIN WEST AND GREAT BASIN WITH SHARPLY FALLING
TEMPERATURES BY TONIGHT. WIND-RELATED ADVISORIES HAVE BEEN POSTED
FOR PORTIONS OF THESE AREAS.
IN THE MEANTIME, A LOW PRESSURE SYSTEM CURRENTLY DEVELOPING OVER
THE CENTRAL HIGH PLAINS WILL BE ENERGIZED AS THE VIGOROUS UPPER
TROUGH SWEEPS THROUGH THE WESTERN U.S. TODAY. SHOWERS AND
THUNDERSTORMS CURRENTLY DEVELOPING OVER THE CENTRAL PLAINS AHEAD
OF THE LOW PRESSURE SYSTEM WILL LIKELY EXPAND TOWARD THE EAST AND
NORTHEAST FOR THE NEXT FEW DAYS AS THE SYSTEM EXPANDS AND
INTENSIFIES. THIS SYSTEM WILL ALSO HELP THE MOUNTAIN SNOWS AND
LOWER-ELEVATION RAINS TO LINGER A BIT LONGER OVER THE CENTRAL
ROCKIES AND HIGH PLAINS THROUGH MONDAY AND INTO MONDAY NIGHT. ON
THE WARM SIDE OF THE SYSTEM, THUNDERSTORMS COULD BECOME SEVERE
PARTICULARLY BY LATER ON MONDAY ACROSS THE DEEP SOUTH AS A WARM
FRONT LIFTS NORTHEASTWARD ACROSS THE REGION WITH AN INFLUX OF WARM
AND MOIST AIR FROM THE GULF OF MEXICO. BY TUESDAY MORNING, THE
CENTER OF THE LOW PRESSURE SYSTEM IS FORECAST TO REACH INTO THE
OHIO VALLEY WITH WIDESPREAD RAINFALL FROM THE LOWER GREAT LAKES
DOWN INTO THE OHIO VALLEY, SOUTHERN APPALACHIANS AND INTO THE
INTERIOR SOUTHEAST. THUNDERSTORMS COULD AGAIN REACH SEVERE LEVELS
ACROSS THE MID-SOUTH AND POSSIBLY DOWN TOWARD THE CENTRAL GULF
COAST AS THE DYNAMIC COLD FRONT SWEEPS ACROSS THE REGION FROM WEST
TO EAST.
FARTHER NORTH, COLDER AIR FROM CANADA COULD BRING SOME LIGHT
WINTRY MIX INTO THE UPPER MIDWEST EARLY ON TUESDAY. THE SAME CAN
BE SAID FOR INTERIOR NEW ENGLAND TODAY INTO TONIGHT WITH THE
PASSAGE OF AN ARCTIC FRONT. THE REMAINDER OF THE EAST COAST WILL
BE MOSTLY DRY THROUGH TUESDAY MORNING BEFORE THE LEADING EDGE OF
THE MOISTURE FROM THE OHIO VALLEY STORM ARRIVES. TEMPERATURES WILL
BE GENERALLY SEASONABLE FOR THE EAST COAST, COOL AND BIT BELOW
AVERAGE FOR NEW ENGLAND, BUT WILL REMAIN MILD OVER THE NORTHERN
PLAINS. IN CONTRAST, TEMPERATURES WILL BE BELOW AVERAGE ACROSS
MUCH OF THE WEST WITH THE PASSAGE OF THE UPPER TROUGH. HIGHS ALONG
THE COAST WILL BE CLOSER TO SEASONABLE WITH MOSTLY 50S AND 60S,
AND 70S FOR SOUTHERN CALIFORNIA.
KONG
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