804
FXUS01 KWBC 180810
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SAT NOV 18 2023
VALID 12Z SAT NOV 18 2023 - 12Z MON NOV 20 2023
...UNSETTLED WEATHER EXPANDS ACROSS THE WESTERN U.S. WITH STRONG
WINDS, HIGH-ELEVATION SNOWS AND COASTAL RAINS...
...ANOTHER SYSTEM FORMING OVER THE CENTRAL HIGH PLAINS WILL BRING
AN EXPANDING AREA OF SHOWERS AND THUNDERSTORMS ACROSS THE CENTRAL
U.S....
..GREAT PLAINS WARMS UP AS THE WEST COOLS DOWN
MORE UNSETTLED WEATHER IS EXPECTED TO REACH THE WEST COAST THROUGH
THE NEXT COUPLE OF DAYS AS A SOUTHERN STREAM CYCLONE MERGES AND
PHASES WITH A VIGOROUS NORTHERN STREAM TROUGH. NORTHERN
CALIFORNIA IS ALREADY RECEIVING FREQUENT ROUNDS OF MODERATE RAIN
AHEAD OF THE SOUTHERN STREAM CYCLONE, WITH SNOW BEGINNING TO REACH
INTO THE SIERRA NEVADA. BY TONIGHT, THE NORTHERN STREAM TROUGH IS
FORECAST TO MERGE WITH THE SOUTHERN STREAM CYCLONE NEAR THE WEST
COAST. THIS INTERACTION WILL SEND AN EXPANDING AREA OF
HIGH-ELEVATION SNOW AND VALLEY RAIN RAPIDLY INLAND THROUGH THE
INTERMOUNTAIN WEST AND THE GREAT BASIN ON SUNDAY, TOGETHER WITH A
SURGE OF COLD AIR WITH STRONG WINDS THROUGH MUCH OF THE WESTERN
U.S.
MEANWHILE, A NEW LOW PRESSURE SYSTEM IS FORECAST TO FORM OVER THE
CENTRAL HIGH PLAINS TONIGHT. THIS SYSTEM WILL BE ENERGIZED AS THE
UPPER TROUGH MOVES THROUGH WESTERN U.S. ON SUNDAY, AND THEN BECOME
THE MAIN LOW PRESSURE SYSTEM BY MONDAY MORNING WHEN THE UPPER
TROUGH GETS READY TO EXIT THE ROCKIES. AN AREA OF SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED TO DEVELOP OVER THE CENTRAL PLAINS
ON SUNDAY WHICH WILL LIKELY EXPAND TOWARD THE NORTH AND EAST
QUICKLY SUNDAY NIGHT INTO MONDAY MORNING AS THE SYSTEM FURTHER
CONSOLIDATES.
ALONG THE EAST COAST, A CYCLONE IS FORECAST TO RAPIDLY INTENSIFY
OFFSHORE AND WILL LIKELY MISS NEW ENGLAND AS IT PASSES EAST OF
MAINE TONIGHT. SOME SHOWERS ARE EXPECTED TO MOVE ACROSS THE
NORTHEAST AND DOWN INTO THE APPALACHIANS TODAY AHEAD OF THE FRONT.
COLDER AIR WILL SPREAD INTO NEW ENGLAND BY TONIGHT, WITH PERIODS
OF LIGHT SNOW EXPECTED TO DEVELOP OVER THE INTERIOR SECTIONS ON
SUNDAY.
MUCH OF THE COUNTRY WILL BE MILDER THAN NORMAL BEFORE THE SURGE OF
COLD AIR BEHIND THE UPPER TROUGH REACHES INTO THE WESTERN U.S. ON
SUNDAY. THE EAST WILL ALSO BE VERY MILD BEFORE COOLER THAN NORMAL
TEMPERATURES OVERSPREAD THE REGION BEHIND A COLD FRONT.
MEANWHILE, TEMPERATURES CLIMB OVER THE GREAT PLAINS BENEATH AN
AREA OF HIGH PRESSURE AND OUT AHEAD OF THE APPROACHING MID TO
UPPER-LEVEL TROUGH.
KONG
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