144
FXUS01 KWBC 240611
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
210 AM EDT SUN MAY 24 2026
VALID 12Z SUN MAY 24 2026 - 12Z TUE MAY 26 2026
...WET, STORMY, AND UNSETTLED WEATHER CONTINUES FOR MUCH OF THE
EASTERN HALF OF THE U.S. THROUGH MEMORIAL DAY...
...WARM AND MAINLY DRY WEATHER ACROSS THE WEST GIVES WAY TO
INCREASING SHOWER CHANCES EARLY TO MID NEXT WEEK...
LOW PRESSURE SYSTEMS INTERACTING WITH ROBUST MOISTURE ALONG A
SLOW-MOVING AND WAVY FRONTAL BOUNDARY WILL CONTINUE TO RESULT IN
WET AND ACTIVE WEATHER ACROSS MUCH OF THE EASTERN HALF OF THE
COUNTRY THROUGH MEMORIAL DAY. MULTIPLE ROUNDS OF SHOWERS AND
THUNDERSTORMS ARE EXPECTED FROM THE LOWER MISSISSIPPI VALLEY,
MID-SOUTH, AND SOUTHEAST, TO THE OHIO VALLEY, MID-ATLANTIC, AND
NORTHEAST THE NEXT COUPLE OF DAYS. WHILE WIDESPREAD SEVERE WEATHER
IS UNLIKELY, A FEW CLUSTERS OF STORMS WITHIN THE WARM AND HUMID
AIR MASS ALONG AND SOUTH OF THE FRONT MAY BECOME LOCALLY STRONG TO
SEVERE. SHOULD THAT OCCUR, DAMAGING WINDS AND HAIL WOULD BE THE
MAIN THREATS. STORMS MAY ALSO PRODUCE HEAVY DOWNPOURS, ESPECIALLY
ACROSS PARTS OF THE OHIO VALLEY AND CENTRAL APPALACHIANS TODAY AND
FOR PORTIONS OF THE CENTRAL GULF COAST AND SOUTHEAST ON MEMORIAL
DAY. A SLIGHT RISK (LEVEL 2/4) OF EXCESSIVE RAINFALL HAS BEEN
ISSUED FOR BOTH REGIONS, HIGHLIGHTING THE POTENTIAL FOR SCATTERED
INSTANCES OF FLASH FLOODING WHERE SOILS ARE ALREADY SATURATED FROM
PRIOR RAINFALL. NORTH OF THE BOUNDARY, A STRONG AREA OF HIGH
PRESSURE POSITIONED OVER EASTERN CANADA CONTINUES TO WEDGE UP
AGAINST THE EASTERN SLOPES OF THE APPALACHIANS, KEEPING THE
MID-ATLANTIC AND NORTHEAST CLOUDY, DAMP, AND UNSEASONABLY COOL.
WARMER AIR DOES TRY TO ADVANCE NORTHWARD LATER SUNDAY INTO
MEMORIAL DAY AS THE CANADIAN HIGH PRESSURE RETREATS EASTWARD, BUT
IT MAY TAKE TIME TO SCOUR OUT ALL OF THE COOL AND MOIST AIR
TRAPPED IN THE LOWEST LEVELS OF THE ATMOSPHERE. THE SURGE OF
WARMER AIR WILL ALSO LIKELY BRING ADDITIONAL RISKS OF SHOWERS AND
THUNDERSTORMS THOUGH WITH INCREASING DRY TIME IN BETWEEN WETTER
PERIODS.
IN CONTRAST TO THE WET AND STORMY WEATHER ACROSS THE EAST, THE
WESTERN U.S. WILL STAY UNSEASONABLY WARM AND MAINLY DRY THROUGH
SUNDAY AS BROAD UPPER-LEVEL RIDGING REMAINS IN PLACE. HIGH
TEMPERATURES WILL CONTINUE TO RUN SEVERAL DEGREES ABOVE NORMAL,
PEAKING IN THE 70S AND 80S FOR MOST. THE HOTTEST TEMPERATURES WILL
STAY CONFINED TO THE DESERT VALLEYS OF CALIFORNIA, NEVADA, AND
ARIZONA WHERE HIGHS WILL SOAR WELL INTO THE 90S AND 100S THROUGH
EARLY NEXT WEEK. A FEW SPOTTY SHOWERS MAY POP UP OVER THE HIGHER
TERRAIN OF THE ROCKIES AND SIERRA ON SUNDAY AFTERNOON, BUT THESE
WOULDN'T BE HEAVY ENOUGH OR LAST LONG ENOUGH TO SPOIL HOLIDAY
PLANS. MOST PLACES ACROSS THE WEST STAY DRY ON MEMORIAL DAY TOO,
THOUGH A FEW MORE SCATTERED MOUNTAIN AND HIGH VALLEY SHOWERS AND
STORMS ARE LIKELY TO FLARE UP ACROSS THE CENTRAL AND SOUTHERN
ROCKIES DURING THE AFTERNOON AS MOISTURE INCREASES. THE PACIFIC
NORTHWEST AND NORTHERN INTERMOUNTAIN WEST THEN START TO BECOME
MORE ACTIVE LATER MONDAY INTO TUESDAY WITH THE ARRIVAL OF A
PACIFIC LOW PRESSURE SYSTEM THAT IS LIKELY TO BRING FAIRLY
WIDESPREAD RAIN SHOWERS INLAND. COLDER AIR ASSOCIATED WITH THIS
LOW MAY EVEN ALLOW RAIN SHOWERS TO MIX WITH OR CHANGE TO A LITTLE
SNOW IN THE HIGHEST ELEVATIONS OF THE CASCADES MONDAY NIGHT INTO
TUESDAY. AT THE VERY LEAST, THE COLDER AIR WILL BRING THE EXTENDED
STRETCH OF UNSEASONABLE WARMTH ACROSS THE WEST TO AN END, WITH
NEAR TO BELOW NORMAL TEMPERATURES STICKING AROUND THROUGH MIDWEEK.
MILLER
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