511
FXUS01 KWBC 200730
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
229 AM EST TUE FEB 20 2024
VALID 12Z TUE FEB 20 2024 - 12Z THU FEB 22 2024
...HEAVY RAIN AND HEAVY MOUNTAIN SNOW IN CALIFORNIA ARE EXPECTED
TO BECOME LESS INTENSE...
...A MODERATE RISK OF EXCESSIVE RAINFALL REMAINS IN EFFECT ALONG
PORTIONS OF COASTAL SOUTHERN CALIFORNIA TODAY...
...WARMING TREND EXPECTED TO EXPAND FROM THE GREAT PLAINS INTO THE
MIDWEST THROUGH MIDWEEK...
HEAVY RAIN, SNOW, HIGH WINDS AND THUNDERSTORM IMPACTS WILL
GRADUALLY DIMINISH ACROSS CALIFORNIA TODAY, AS THE UPPER TROUGH
SUPPORTING THEM PUSHES FARTHER INLAND. A QUASI-STATIONARY FRONT
WILL BE THE FOCUS FOR ADDITIONAL HEAVY RAINFALL OVER SOUTHERN
CALIFORNIA TODAY. A MODERATE RISK OF EXCESSIVE RAINFALL LEADING TO
FLASH FLOODING (LEVEL 3/4) IS IN EFFECT FOR PORTIONS OF LOS
ANGELES AND ORANGE COUNTIES WHERE BETWEEN 1-3 INCHES OF RAIN ARE
POSSIBLE. HIGHER TOTALS ARE EXPECTED ALONG THE IMMEDIATE COAST AND
FAVORED TERRAIN OF THE TRANSVERSE RANGES. A BROADER SLIGHT RISK
AREA (LEVEL 2/4) IS IN EFFECT FROM HUMBOLDT COUNTY DOWN TO SAN
DIEGO, AS WELL AS THE SACRAMENTO VALLEY AND ADJACENT UPSLOPE AREAS
OF THE SIERRA. ADDITIONAL ACCUMULATIONS OF 6-12 INCHES OF SNOW ARE
EXPECTED FOR THE SIERRA, WHILE 1-2 FEET ARE LIKELY OVER THE SHASTA
SISKIYOUS TODAY. PERSISTENT TROUGHING AND UPSLOPING WILL SUPPORT
MODERATE TO HEAVY SNOW OVER THE INTERMOUNTAIN WEST WHERE GENERALLY
BETWEEN 6-12 INCHES OF SNOW CAN BE EXPECTED. THIS SNOWFALL IS
LIKELY TO CONTINUE INTO WEDNESDAY AND EXPAND IN COVERAGE INTO THE
CENTRAL ROCKIES.
ELSEWHERE, THE ONGOING WARMING TREND IS EXPECTED TO CONTINUE
ACROSS THE GREAT PLAINS AND MISSISSIPPI VALLEY THROUGH WEDNESDAY
BEFORE MODERATING A BIT AND RESURGING ONCE AGAIN HEADING INTO THE
WEEKEND. HIGH TEMPERATURES WILL BE 15-25 DEGREES ABOVE AVERAGE
TODAY AND WEDNESDAY OVER THE GREAT PLAINS AND MISSISSIPPI VALLEY
WHILE MILD AIR SHIFT SLOWLY INTO THE MIDWEST AND EAST COAST. THE
FLORIDA PENINSULA WILL REMAIN BELOW AVERAGE TEMPERATURE-WISE DUE
TO A DEEPENING UPPER TROUGH IN THE WESTERN ATLANTIC. A DEVELOPING
LOW PRESSURE SYSTEM WILL BRING SHOWERS AND THUNDERSTORMS TO THE
MIDWEST ON THURSDAY.
KEBEDE
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