823
FXUS01 KWBC 201929
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
321 PM EDT MON APR 20 2026
VALID 00Z TUE APR 21 2026 - 00Z THU APR 23 2026
...PACIFIC SYSTEM WILL BRING PRECIPITATION TO THE WEST COAST THE
NEXT COUPLE OF DAYS, WITH HEAVY SNOW EXPECTED FOR THE SIERRA
NEVADA...
...A LINGERING FRONTAL BOUNDARY WILL BRING SHOWERS AND
THUNDERSTORMS TO PORTIONS OF TEXAS, WITH ISOLATED FLASH FLOODING
POSSIBLE...
...SHOWERS AND THUNDERSTORMS FORECAST TO RECOMMENCE IN THE
NORTHERN AND CENTRAL PLAINS LATE ON WEDNESDAY NIGHT/THURSDAY
MORNING...
A DEEP PACIFIC UPPER-LEVEL TROUGH AND ASSOCIATED SURFACE FRONTAL
SYSTEM WILL CONTINUE PROGRESSING INLAND ALONG THE WEST COAST OVER
THE NEXT COUPLE OF DAYS, BRINGING INCREASINGLY WIDESPREAD
PRECIPITATION AS IT CONTINUES EASTWARD. MODERATE TO LOCALLY HEAVY
SHOWERS AND THUNDERSTORMS WILL MOVE INTO PORTIONS OF
NORTHERN/CENTRAL CALIFORNIA THIS AFTERNOON/EVENING BEFORE
EXPANDING IN COVERAGE INTO THE PACIFIC NORTHWEST, GREAT BASIN, AND
INTO SOUTHERN CALIFORNIA TUESDAY. THE HIGHEST RAIN TOTALS ARE
EXPECTED TO CONVERGE ALONG THE COASTAL RANGES OF NORTHERN/CENTRAL
CALIFORNIA AND UPSLOPE REGIONS OF THE SIERRA NEVADA, WHERE SOME
ISOLATED FLOODING COULD OCCUR. ADDITIONALLY, VERY HEAVY SNOW IS
FORECAST IN THE SIERRA NEVADA REGION, WHERE TOTALS COULD REACH AS
HIGH AS 12-18 INCHES ON TUESDAY AND WEDNESDAY. THE HIGHEST PEAKS
OF THE MOUNTAINOUS AREAS COULD EVEN SEE UP TO 2 FEET OF SNOW.
OTHER HIGHER ELEVATION MOUNTAINS THROUGHOUT NORTHERN CALIFORNIA AS
WELL AS INTO THE GREAT BASIN AND NORTH INTO THE CASCADES COULD
ALSO SEE SNOW, THOUGH WITH MORE LIMITED ACCUMULATIONS. THE SYSTEM
WILL SHIFT INTO THE NORTHERN ROCKIES ON WEDNESDAY, BRINGING LOWER
ELEVATION RAIN AND HIGH ELEVATION MOUNTAIN SNOW, BEFORE CONTINUING
EASTWARD THROUGH THE CONUS.
SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE IN SOUTHERN
FLORIDA AND PARTS OF SOUTH TEXAS, AS A QUASI-STATIONARY FRONTAL
BOUNDARY REMAINS IN PLACE OVER THE NEXT SEVERAL DAYS. ISOLATED
FLASH FLOODING WILL BE POSSIBLE FOR PORTIONS OF TEXAS, WITH THE
GREATEST CONCENTRATION OF STORMS EXPECTED ALONG THE BOUNDARY,
FIRST THROUGH CENTRAL TEXAS TODAY AND THEN FURTHER EAST TOWARDS
THE UPPER TEXAS GULF COAST ON TUESDAY. AS SUCH, A MARGINAL RISK
(LEVEL 1/4) OF EXCESSIVE RAINFALL IS EXPECTED FOR THIS AREA OF
TEXAS OVER THE NEXT THREE DAYS, PER THE LATEST WPC EXCESSIVE
RAINFALL OUTLOOK. ELSEWHERE, LINGERING WINTRY MIX WILL TAPER OFF
ACROSS PORTIONS OF THE INTERIOR NORTHEAST TODAY, AND AN INCOMING
FRONTAL SYSTEM WILL BRING SCATTERED SHOWERS AND THUNDERSTORMS TO
THE GREAT LAKES/OHIO VALLEY VICINITY TUESDAY.
LATER THIS WEEK, THE AFOREMENTIONED DEEP UPPER-LEVEL TROUGH WILL
TRAVERSE ITS WAY THROUGH THE WEST, AND ARRIVE INTO THE WESTERN
PLAINS BY MIDWEEK. CONCURRENTLY, A DRYLINE IS EXPECTED TO DEVELOP
FROM SOUTHWEST TEXAS UP THROUGH MUCH OF EASTERN COLORADO. AN
INFLUX OF MOISTURE FROM THE GULF, AND A STRONG SOUTHERLY LOW-LEVEL
JET WILL AID IN PRODUCING THUNDERSTORMS ALONG THE COLD FRONT IN
THE NORTHERN PLAINS ON WEDNESDAY EVENING. THIS WILL ALSO SET THE
STAGE FOR A POTENTIALLY ACTIVE END TO THE WEEK IN THE MEDIUM RANGE
FOR THE PLAINS.
A STRONG UPPER-LEVEL RIDGE WILL BRING A PERIOD OF
WELL-ABOVE-AVERAGE TEMPERATURES FROM THE INTERIOR WEST INTO THE
NORTHERN/CENTRAL PLAINS AND THEN MIDWEST THROUGH MIDWEEK. FORECAST
HIGHS WILL BE INTO THE 70S AND LOW 80S, WITH SOME MID- TO
UPPER-80S POSSIBLE FOR LOCATIONS IN THE NORTHERN/CENTRAL PLAINS
TUESDAY-WEDNESDAY. THE INCOMING PACIFIC SYSTEM WILL GRADUALLY
BRING IN COOLER WEATHER FROM THE WEST, FIRST TO THE WEST COAST BY
TUESDAY AS HIGHS FALL INTO THE 50S AND 60S, AND THEN INTO THE
GREAT BASIN WEDNESDAY AS HIGHS FALL MAINLY INTO THE 50S. THE
DESERT SOUTHWEST WILL TREND DOWNWARDS FROM THE 90S TODAY INTO THE
70S AND 80S BY WEDNESDAY. MEANWHILE, TO THE EAST, LINGERING COOLER
AIR WILL CONTINUE TODAY FOLLOWING A FRONTAL PASSAGE. THE COLDEST
TEMPERATURES WILL BE ACROSS THE MIDWEST AND NORTHEAST WITH HIGHS
MAINLY IN THE 40S AND 50S. MORNING LOWS DROPPING TO THE LOW 30S
TUESDAY MORNING HAVE PROMPTED FREEZE WARNINGS ACROSS PORTIONS OF
THE OHIO VALLEY INTO THE MID-ATLANTIC. MUCH OF TEXAS WILL ALSO BE
BELOW AVERAGE WITH CLOUD COVER AND RAINY CONDITIONS IN PLACE AS
THE FRONT LINGERS IN THE REGION, WITH HIGHS MAINLY IN THE 60S ON
MONDAY. AVERAGE TO ABOVE-AVERAGE CONDITIONS WILL RETURN TO MOST
TUESDAY-WEDNESDAY AS THE AIRMASS MODIFIES FOLLOWING THE FRONTAL
PASSAGE, WITH 60S AND 70S FOR MORE NORTHERN LOCATIONS AND 80S
ALONG THE SOUTHERN TIER. ADDITIONALLY, AN ELEVATED RISK OF FIRE
WEATHER IS EXPECTED FOR PARTS OF THE SOUTHERN MID-ATLANTIC,
SOUTHEAST, AND PARTS OF THE CENTRAL PLAINS TODAY, AND FLORIDA AND
PARTS OF THE LOWER MISSISSIPPI VALLEY ON TUESDAY.
BLANCO-ALCALA/PUTNAM
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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