551
FXUS01 KWBC 311959
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
258 PM EST WED JAN 31 2024
VALID 00Z THU FEB 01 2024 - 00Z SAT FEB 03 2024
...FLASH FLOODING POSSIBLE ACROSS PARTS OF NORTHERN/CENTRAL
CALIFORNIA TODAY, THEN CENTRAL/SOUTHERN CALIFORNIA ON THURSDAY...
...HEAVY SNOW SPREADS INTO THE SIERRA NEVADA, GREAT BASIN,
INTERMOUNTAIN WEST AND ROCKIES...
...ABOVE AVERAGE TEMPERATURES CONTINUE ACROSS MIDDLE THIRD OF THE
COUNTRY...
MOISTURE WILL FOCUS ALONG A STRONG SURFACE FRONT ENTERING THE WEST
COAST TONIGHT. HEAVY TO EXCESSIVE RAINFALL IS EXPECTED TO IMPACT
THE SOUTHERN OREGON COAST DOWN THROUGH CENTRAL CALIFORNIA TONIGHT
INTO EARLY THURSDAY MORNING. A SLIGHT RISK (LEVEL 2/4) OF
EXCESSIVE RAINFALL LEADING TO FLASH FLOODING IS IN EFFECT FOR MUCH
OF THE AFOREMENTIONED AREAS THIS EVENING. THE FLASH FLOODING
THREAT SHIFTS SOUTHWARD INTO SOUTHERN CALIFORNIA, PORTIONS OF THE
CENTRAL VALLEY AND THE FOOTHILLS OF THE SIERRA NEVADA ON THURSDAY
AS THE AXIS OF HEAVY RAIN AND THUNDERSTORMS SAGS SOUTH INTO A
HIGHLY SENSITIVE AND/OR URBANIZED CORRIDOR. A SLIGHT RISK (LEVEL
2/4) OF EXCESSIVE RAINFALL IS IN EFFECT FOR MUCH OF THE SOUTHERN
CALIFORNIA COAST FROM LOS ANGELES COUNTY DOWN THROUGH THE SAN
DIEGO METRO.
HEAVY SNOW WILL EXPAND FROM THE SHASTA SISKIYOUS TO THE SIERRA
NEVADA TONIGHT BEFORE SPILLING OUT OVER THE GREAT BASIN ON
THURSDAY AND EVENTUALLY PORTIONS OF THE INTERMOUNTAIN WEST AND
ROCKIES ON FRIDAY. THE HEAVIEST SNOWFALL WILL OCCUR OVER THE
SHASTA SISKIYOUS AND SIERRA WHERE 1-3' FEET (ISOLATED 4') ARE
EXPECTED. GENERALLY 1-2 FEET ARE EXPECTED OVER THE HIGHER
ELEVATIONS OF THE WESTERN MOUNTAINS WITH ISOLATED 2'+ AMOUNTS
POSSIBLE. LOW ELEVATION RAIN IS ALSO EXPECTED AS THERE WILL BE
WARM AIR ASSOCIATED WITH THIS LOW PRESSURE SYSTEM. CLOUDY
CONDITIONS WILL KEEP TEMPERATURES COOLER THAN AVERAGE FOR MUCH OF
THE WEST COAST AND SOUTHWEST OVER THE NEXT COUPLE OF DAYS.
A STRONG OMEGA BLOCK HIGH WILL SUPPORT ABOVE AVERAGE HEIGHTS AND
TEMPERATURES ACROSS THE CENTRAL PLAINS AND MISSISSIPPI VALLEY OVER
THE NEXT FEW DAYS. LOW TEMPERATURES IN THE 30S AND 40S MAY BREAK
EXISTING RECORDS TONIGHT OVER PARTS OF THE CENTRAL/SOUTHERN PLAINS
AND UPPER/MIDDLE MISSISSIPPI VALLEY. HIGH AND LOW TEMPERATURE
ANOMALIES WILL BE +20-40 DEGREES ABOVE AVERAGE. ELSEWHERE, SNOW
SHOWERS ARE POSSIBLE DOWNWIND OF THE LOWER GREAT LAKES AND
INTERIOR NORTHEAST OVER THE NEXT COUPLE OF DAYS DUE TO A LOW
PRESSURE SYSTEM COMING OUT OF CANADA. 2-4" OF SNOWFALL MAY
ACCUMULATE OVER NORTHERN MAINE BY FRIDAY.
KEBEDE
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