985
FXUS01 KWBC 240812
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
410 AM EDT MON APR 24 2023
VALID 12Z MON APR 24 2023 - 12Z WED APR 26 2023
...MOUNTAIN SNOW AND COASTAL/VALLEY SHOWERS OVER THE PACIFIC
NORTHWEST WILL CONTINUE TO SPREAD INTO THE NORTHERN AND CENTRAL
ROCKIES...
...HEAVY WET SNOW CAN BE EXPECTED OVER CENTRAL COLORADO BY LATE
TUESDAY/EARLY WEDNESDAY...
...MARCH-LIKE COLD TEMPERATURES WITH ADDITIONAL MORNING
FROSTS/FREEZES ACROSS MUCH OF THE EASTERN TWO-THIRDS OF THE
COUNTRY..
...DAMP AND DREARY CONDITIONS TO LINGER IN NEW ENGLAND WITH
HIGH-ELEVATION WET SNOW AT TIMES...
...MORE SHOWERS AND STORMS TO DEVELOP TUESDAY AND WEDNESDAY IN THE
SOUTH-CENTRAL U.S....
AS A LINGERING LOW PRESSURE SYSTEM BRINGS ADDITIONAL ROUNDS OF
SHOWERS, HIGH-ELEVATION WET SNOW, AND SOME THUNDERSTORMS ACROSS
NEW ENGLAND FOR THE NEXT COUPLE OF DAYS, MOISTURE AHEAD OF THE
NEXT WEATHER MAKER HAS ALREADY MOVED INTO THE PACIFIC NORTHWEST
WITH A SOLID ROUND OF MOUNTAIN SNOW AND LOWER ELEVATION MODERATE
TO LOCALLY HEAVY RAIN. IN CONTRAST TO THE SLOW-MOVING LOW OVER
THE NORTHEAST, THE SYSTEM MOVING INTO THE PACIFIC NORTHWEST WILL
MOVE RELATIVELY QUICKLY AND STEADILY INLAND, BRINGING WIDESPREAD
MOUNTAIN SNOW AND VALLEY RAIN ACROSS THE NORTHERN ROCKIES TODAY,
REACHING INTO THE CENTRAL ROCKIES BY TUESDAY. IT APPEARS THAT
HEAVY WET SNOW CAN BE EXPECTED FROM LATE TUESDAY INTO EARLY
WEDNESDAY MORNING OVER THE COLORADO ROCKIES, THE FOOTHILLS, AND
POSSIBLY SPREADING EAST INTO THE FRONT RANGE, AS A COLD FRONT
RACES ACROSS THE INTERMOUNTAIN WEST AND A LOW PRESSURE SYSTEM
DEVELOPS OVER THE CENTRAL HIGH PLAINS ON TUESDAY. THIS SYSTEM
WILL ALSO BE RESPONSIBLE FOR TRIGGERING AND EXPANDING THE NEXT
ROUND OF SHOWERS AND THUNDERSTORMS ACROSS THE CENTRAL TO SOUTHERN
PLAINS BEGINNING ON TUESDAY, WITH THE THREAT OF FLASH FLOODING
INCREASING LATER ON TUESDAY. SOME OF THE THUNDERSTORMS ARE
EXPECTED TO TURN SEVERE, ESPECIALLY FARTHER SOUTH IN THE WARM
SECTOR ACROSS EASTERN TEXAS.
MEANWHILE, A LARGE DOME OF CANADIAN HIGH PRESSURE HAS TAKEN HOLD
OF THE NATION'S HEARTLAND AND WILL SPREAD EAST INTO THE MID-SOUTH
AND MID-ATLANTIC DURING THE FIRST HALF OF THE WEEK. ACCOMPANYING
THIS LARGE HIGH PRESSURE SYSTEM IS AN EVEN MORE EXTENSIVE AREA OF
BELOW NORMAL TEMPERATURES. TODAY'S DAILY LOW TEMPERATURES FROM THE
MIDDLE MISSISSIPPI VALLEY ON EAST INTO THE OHIO/TENNESSEE VALLEYS
AND NORTHERN MID-ATLANTIC WILL PLUNGE NEAR OR BELOW FREEZING,
PROMPTING THE ISSUANCE OF FREEZE WARNINGS AND FROST ADVISORIES IN
SOME OF THESE AREAS. A HANDFUL OF DAILY RECORD LOW MINIMUM AND
MAXIMUM TEMPERATURES ARE POSSIBLE AS WELL. TEMPERATURES EAST OF
THE ROCKIES AND INTO THE MID-ATLANTIC ARE LIKELY TO AVERAGE 10-15
DEGREES BELOW NORMAL THROUGH MID-WEEK, MAKING IT FEEL MORE LIKE
MARCH OUTSIDE RATHER THAN LATE APRIL. THE UNUSUALLY CHILLY
TEMPERATURES WILL BE COLD ENOUGH TO WHERE SOME PRECIPITATION IN
THE UPPER GREAT LAKES WILL FALL IN THE FORM SNOW AT TIMES ON
MONDAY, BUT LITTLE IN THE WAY OF ACCUMULATION IS EXPECTED. FARTHER
WEST, AN UPPER LEVEL RIDGE STRENGTHENING OFF THE COAST TOMORROW
AND INTO MID-WEEK WILL FOSTER WARMER THAN NORMAL TEMPERATURES IN
CALIFORNIA AND THE DESERT SOUTHWEST. BY TUESDAY, PORTIONS OF
CALIFORNIA'S GREAT VALLEY WILL RISE WELL INTO THE 80S WITH DESERT
AREAS OF SOUTHERN CALIFORNIA AND ARIZONA ECLIPSING THE 90 DEGREE
MARK.
ONE OF THE REASONS FOR THE COOLER THAN NORMAL TEMPERATURES REGIME
IN THE EASTERN AND CENTRAL U.S. IS A LARGE, SPIRALING UPPER LOW
OVER THE GREAT LAKES AND ONTARIO BEING BLOCKED BY A RIDGE OF HIGH
PRESSURE OVER QUEBEC AND THE DAVIS STRAIT. THIS RIDGE IS FORCING A
STORM SYSTEM OFF THE NORTHEAST COAST TO BECOME STATIONARY, MAKING
FOR A DREARY AND UNSETTLED WEATHER TO CONTINUE FOR MUCH OF NEW
ENGLAND INTO MIDWEEK.
KONG/MULLINAX
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