783
FXUS01 KWBC 220818
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
415 AM EDT SAT APR 22 2023
VALID 12Z SAT APR 22 2023 - 12Z MON APR 24 2023
...A COLD FRONT WILL BRING A ROUND OF SHOWERS AND THUNDERSTORMS
THROUGH THE EASTERN U.S. WITH SEVERE THUNDERSTORMS POSSIBLE LATER
TODAY ALONG THE EAST COAST...
...AREAS OF HEAVY RAIN AND SEVERE THUNDERSTORMS POSSIBLE NEXT
COUPLE OF DAYS ACROSS SOUTHERN TEXAS...
...MOUNTAIN SNOW AND COASTAL/VALLEY SHOWERS FOR THE
NORTHERN/CENTRAL ROCKIES AND PACIFIC NORTHWEST; SNOW WILL CONTINUE
TO SLOWLY TAPER OFF TODAY OVER THE UPPER MIDWEST WITH LINGERING
COLD ACROSS THE PLAINS AND OHIO VALLEY...
A COLD FRONT IS FORECAST TO MOVE FROM WEST TO EAST ACROSS THE
EASTERN U.S. AT A FASTER PACE TODAY. SHOWERS AND THUNDERSTORMS
AHEAD OF THE FRONT ARE EXPECTED TO SWEEP THROUGH THE EASTERN U.S.
THE GREATEST CHANCE FOR THE THUNDERSTORMS TO BECOME SEVERE WILL BE
ALONG THE EAST COAST LATER TODAY. A SUDDEN ONSET OF HEAVY RAIN
CAN BE EXPECTED AS THE THUNDERSTORMS ARRIVE. HOWEVER, THE
RELATIVELY FAST MOVEMENT OF THE FRONT WILL LIKELY LIMIT THE THREAT
OF FLASH FLOODING AT A GIVEN LOCATION. COLD AIR BEHIND THE FRONT
WILL USHER INTO THE EASTERN U.S. BY TONIGHT, ENDING THE RECENT
WARM SPELL ACROSS THE ENTIRE REGION. BY SUNDAY, A LOW PRESSURE
WAVE FORMING ON THE FRONT WILL SLOW DOWN THE EASTWARD PROGRESSION
OF THE FRONT. THIS WILL KEEP NEW ENGLAND WITH A MARGINAL RISK OF
FLASH FLOODING ON SUNDAY BEFORE THE LOW SLOWLY PULL OFF THE COAST
ON MONDAY.
THE AFOREMENTIONED COLD FRONT SWEEPING THROUGH THE EASTERN U.S
THIS WEEKEND WILL ALSO BE INTRODUCING AN EXCEPTIONALLY COLD
AIR-MASS, IN THE FORM OF CANADIAN HIGH PRESSURE, THROUGH THE
NATION'S HEARTLAND THIS AFTERNOON. TEMPERATURES ARE FORECAST TO
DROP BELOW FREEZING IN PARTS OF THE CENTRAL PLAINS THIS MORNING,
RESULTING IN THE ISSUANCE OF FREEZE WARNINGS AND WATCHES FROM
EASTERN KANSAS AND NEBRASKA TO PORTIONS OF THE MIDDLE MISSISSIPPI
RIVER VALLEY. THIS PUSH OF ANOMALOUSLY COOLER TEMPERATURES WILL
MAKE THEIR WAY THROUGH THE OHIO AND TENNESSEE VALLEYS TONIGHT,
THEN AS FAR EAST AS THE MID-ATLANTIC AND SOUTHEAST BY THIS
EVENING. NEW ENGLAND WILL REMAIN UNDER THE INFLUENCE OF ONSHORE
FLOW, KEEPING COOLER THAN NORMAL TEMPERATURES LOCKED IN OVER MUCH
OF THE REGION THROUGHOUT THE DURATION OF THE WEEKEND. SUNDAY HAS
THE BEST ODDS OF THE TWO DAYS THIS WEEKEND TO PRODUCE RECORD COLD
DAILY MAXIMUM AND MINIMUM TEMPERATURES. RECORD COLD MINIMUM
TEMPERATURES ARE FORECAST IN PARTS OF THE CENTRAL PLAINS, WITH
RECORD COLD DAILY MAXIMUM TEMPS POSSIBLE IN THE SOUTHERN PLAINS.
MEANWHILE, THE TRAILING PORTION OF THE FRONT WILL BECOME NEARLY
STATIONARY ACROSS NORTHERN MEXICO. A WAVE OF LOW PRESSURE FORMING
OVER THE SOUTHERN HIGH PLAINS WILL INTERACT WITH AN UPPER-LEVEL
JET TO BRING AREAS OF HEAVY RAIN WITH POSSIBLY SEVERE
THUNDERSTORMS OVER NEXT COUPLE OF DAYS ACROSS SOUTHERN TEXAS.
ELSEWHERE, THE PACIFIC NORTHWEST AND BOTH THE NORTHERN AND CENTRAL
ROCKIES WILL CONTEND WITH OCCASIONAL COASTAL/VALLEY SHOWERS AND
MOUNTAIN SNOW THIS WEEKEND. THE FIRST ROUND OF PRECIPITATION
ASSOCIATED WITH AN UPPER LEVEL DISTURBANCE INTERACTING WITH A
FRONTAL BOUNDARY WILL SLOWLY WANE BY TONIGHT. THE NEXT IMPULSE
FROM THE PACIFIC WILL ARRIVE TONIGHT INTO SUNDAY IN THE PACIFIC
NORTHWEST. THIS SYSTEM IS FORECAST TO PUSH INLAND WITH A RE-NEWED
ROUND OF MOUNTAIN SNOW AND VALLEY RAIN ALONG THE CASCADES AND INTO
THE INTERMOUNTAIN WEST BY MONDAY MORNING.
KONG/MULLINAX
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