523
FXUS01 KWBC 200725
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
324 AM EDT MON APR 20 2026
VALID 12Z MON APR 20 2026 - 12Z WED APR 22 2026
...PACIFIC SYSTEM WILL BRING INCREASING PRECIPITATION CHANCES TO
THE WEST COAST THE NEXT COUPLE OF DAYS WITH LOCALLY HEAVY LOWER
ELEVATION RAIN AND HEAVY SNOW FOR THE SIERRA...
...A LINGERING FRONTAL BOUNDARY WILL BRING DAILY THUNDERSTORM
CHANCES TO PORTIONS OF TEXAS WITH ISOLATED FLASH FLOODING
POSSIBLE...
...WIDESPREAD WELL ABOVE AVERAGE TEMPERATURES FOR THE INTERIOR
WEST INTO THE PLAINS WHILE MUCH OF THE EASTERN U.S. REMAINS COLDER
FOLLOWING A FRONTAL PASSAGE THIS WEEKEND...
A DEEP PACIFIC UPPER-LOW AND ASSOCIATED SURFACE FRONTAL SYSTEM
WILL BEGIN TO SLOWLY PROGRESS INLAND ALONG THE WEST COAST OVER
THEN NEXT COUPLE OF DAYS BRINGING INCREASINGLY WIDESPREAD
PRECIPITATION CHANCES. MODERATE TO LOCALLY HEAVY SHOWERS AND
THUNDERSTORMS WILL FIRST MOVE INTO PORTIONS OF NORTHERN/CENTRAL
CALIFORNIA TODAY (MONDAY) BEFORE EXPANDING IN COVERAGE INTO THE
PACIFIC NORTHWEST, GREAT BASIN, AND INTO SOUTHERN CALIFORNIA
TUESDAY. THE HIGHEST RAIN TOTALS ARE EXPECTED TO FOCUS ALONG THE
COASTAL RANGES OF NORTHERN/CENTRAL CALIFORNIA AND UPSLOPE REGIONS
OF THE SIERRA, WHERE SOME ISOLATED FLOODING COULD OCCUR
MONDAY-TUESDAY. IN ADDITION TO THE RAINFALL, VERY HEAVY SNOW IS
FORECAST IN THE SIERRA PEAKING ON TUESDAY, AND TOTALS COULD REACH
AS HIGH AS 1-2 FEET. OTHER HIGHER ELEVATION MOUNTAINS THROUGHOUT
NORTHERN CALIFORNIA AS WELL AS INTO THE GREAT BASIN AND NORTH INTO
THE CASCADES MAY ALSO SEE SOME SNOW, THOUGH AMOUNTS SHOULD REMAIN
MORE LIMITED. THE STORM SYSTEM WILL SHIFT INTO THE NORTHERN
ROCKIES WEDNESDAY BRINGING LOWER ELEVATION RAIN AND HIGH ELEVATION
MOUNTAIN SNOW.
ADDITIONAL SHOWERS AND THUNDERSTORMS ARE EXPECTED TO FOCUS ALONG A
QUASI-STATIONARY FRONTAL BOUNDARY LINGERING THROUGH SOUTH FLORIDA
TODAY AS WELL AS WEST INTO TEXAS THROUGH THE NEXT FEW DAYS. SOME
ISOLATED FLASH FLOODING WILL BE POSSIBLE FOR PORTIONS OF TEXAS
WHERE THE GREATEST CONCENTRATION OF STORMS FOCUS ALONG THE
BOUNDARY, FIRST THROUGH CENTRAL TEXAS TODAY AND THEN FURTHER EAST
TOWARDS THE UPPER TEXAS GULF COAST ON TUESDAY. PRECIPITATION
CHANCES ELSEWHERE AROUND THE COUNTRY WILL BE RATHER LIMITED EARLY
THIS WEEK. A LINGERING WINTRY MIX WILL TAPER OFF ACROSS PORTIONS
OF THE INTERIOR NORTHEAST TODAY, AND AN INCOMING FRONTAL SYSTEM
WILL BRING SOME SCATTERED SHOWER AND THUNDERSTORM CHANCES TO THE
GREAT LAKES/OHIO VALLEY VICINITY TUESDAY.
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 MID-WEEK.
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 MONDAY INTO THE
70S AND 80S BY WEDNESDAY. MEANWHILE, TO THE EAST, LINGERING COOLER
AIR WILL BE IN PLACE MONDAY 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.
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