819
FXUS01 KWBC 230804
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 AM EDT SUN APR 23 2023
VALID 12Z SUN APR 23 2023 - 12Z TUE APR 25 2023
...SHOWERS AND STORMS WITH LOCALLY HEAVY RAIN LINGER IN NEW
ENGLAND SUNDAY-MONDAY...
...AREAS OF HEAVY RAIN AND SEVERE THUNDERSTORMS CONTINUE TODAY
ACROSS SOUTHERN TEXAS...
...FROST/FREEZE EXPECTED ACROSS THE CENTRAL PLAINS INTO THE
MIDWEST THIS MORNING AND MONDAY MORNING...
...MOUNTAIN SNOW AND COASTAL/VALLEY SHOWERS REACHING THE PACIFIC
NORTHWEST WILL CONTINUE TO SPREAD INTO THE NORTHERN AND CENTRAL
ROCKIES THE NEXT COUPLE OF DAYS...
A FRONTAL SYSTEM WILL PUSH OFF THE EAST COAST OVER THE NEXT COUPLE
OF DAYS. HOWEVER, A LOW PRESSURE WAVE FORMING ALONG THE FRONT
WILL BECOME SLOW-MOVING NEAR THE COAST OF NEW ENGLAND. THIS
SYSTEM WILL KEEP SHOWERS AND SOME THUNDERSTORMS WITH LOCALLY HEAVY
RAINFALL POSSIBLE IN THE VICINITY OF NEW ENGLAND THROUGH TUESDAY
MORNING. TEMPERATURES WILL BE MUCH COOLER FOR THE EAST COAST
BEHIND THE FRONT AFTER A COUPLE WEEKS OF ANOMALOUS WARMTH. HIGHS
WILL RANGE FROM THE 40S AND 50S IN NEW ENGLAND, 50S AND 60S IN THE
MID-ATLANTIC, 70S IN THE SOUTHEAST, AND 70S AND 80S IN FLORIDA.
IN CONTRAST, MUCH OF THE PLAINS EASTWARD TO THE EAST COAST WILL
REMAIN RATHER CHILLY FOR THIS TIME OF THE YEAR THANKS TO A COLD
CANADIAN HIGH PRESSURE SYSTEM. HIGHS WILL GENERALLY BE IN THE 30S
AND 40S TODAY. SOME LOW 50S WILL BE POSSIBLE MONDAY. LOWS ACROSS
THE NORTHERN PLAINS WILL DIP INTO THE TEENS FOR SOME LOCATIONS
WHICH, WHEN COMBINED WITH BLUSTERY WINDS, WILL LEAD TO SOME FRIGID
WIND CHILLS. WIDESPREAD FROST/FREEZE RELATED WARNINGS AND
ADVISORIES ARE IN EFFECT AS BELOW FREEZING LOW TEMPERATURES MAY
DAMAGE NEW SPRING VEGETATION, AND A FEW RECORD LOWS MAY BE BROKEN.
SOME MODERATION IN TEMPERATURES IS EXPECTED TO SET IN ON TUESDAY.
MEANWHILE, SHOWERS AND SOME MORE INTENSE THUNDERSTORMS ARE
POSSIBLY ACROSS SOUTHERN TEXAS TODAY AS A COUPLE OF FRONTAL
BOUNDARIES CONVERGE AND INTERACT WITH A JET STREAM ALOFT. THE
TENDENCY FOR STORMS TO CONTINUE TO DEVELOP AND BACK-BUILD ALONG
THE BOUNDARY WILL INCREASE THE THREAT OF SUSTAINED HEAVY RAIN OVER
THE SAME AREAS WHICH COULD RESULT IN SOME SCATTERED INSTANCES OF
FLASH FLOODING. IN ADDITION, SOME OF THE THUNDERSTORMS ARE
EXPECTED TO BECOME STRONG TO SEVERE, AND MAY PRODUCE A FEW
INSTANCES OF LARGE HAIL AND DAMAGING WINDS.
A FRONTAL SYSTEM REACHING INTO THE PACIFIC NORTHWEST THIS MORNING
WILL BRING MORE LOWER ELEVATION COASTAL/VALLEY RAIN AND SOME SNOW
SHOWERS TO HIGHER ELEVATIONS OF THE CASCADES. THE SYSTEM WILL PUSH
EASTWARD THROUGH THE GREAT BASIN AND INTO THE ROCKIES THROUGH THE
NEXT COUPLE OF DAYS. UPSLOPE FLOW EAST OF THE ROCKIES ALONG WITH A
FAST-MOVING SHORTWAVE ALOFT MOVING SOUTHEASTWARD OVER THE REGION
WILL ALL LEAD TO STEADILY INCREASING PRECIPITATION CHANCES THROUGH
THE FORECAST PERIOD. AS WE TRANSITION FURTHER INTO SPRING, SNOW
CHANCES WILL BE ISOLATED TO HIGHER ELEVATIONS IN THE MOUNTAINS
WITH SOME MODERATE ACCUMULATIONS POSSIBLE. LOWER ELEVATIONS WILL
SEE RAIN ALONG WITH THE CHANCE FOR SOME THUNDERSTORMS. HIGH
TEMPERATURES TODAY AND MONDAY WILL GENERALLY BE THE 50S TO LOW 60S
ALONG THE TRACK OF THE STORM SYSTEM THROUGH THE PACIFIC NORTHWEST
INTO THE NORTHERN GREAT BASIN AND THE ROCKIES. A RIDGE BUILDING IN
OFF THE PACIFIC COAST WILL KEEP TEMPERATURES WARMER TO THE SOUTH,
WITH HIGHS IN THE 70S AND 80S FOR MOST OF CALIFORNIA AND THE
SOUTHERN GREAT BASIN AND 90S FOR THE DESERT SOUTHWEST.
KONG/PUTNAM
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