364
FXUS01 KWBC 280648
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
147 AM EST SAT DEC 28 2024
VALID 12Z SAT DEC 28 2024 - 12Z MON DEC 30 2024
...ATMOSPHERIC RIVER TO PRODUCE HEAVY RAIN/SNOW ACROSS MUCH OF THE
NORTHWEST...
...SEVERE THUNDERSTORM OUTBREAK AND EXCESSIVE RAINFALL POTENTIAL
FROM THE SOUTHERN PLAINS TO SOUTHEAST TODAY...
...MILD AND MUCH ABOVE AVERAGE TEMPERATURES WILL PERSIST ACROSS
MOST OF THE COUNTRY...
THE REVOLVING DOOR OF MID-LATITUDE CYCLONES PROPAGATING THROUGH
THE PACIFIC NORTHWEST IS LIKELY TO CONTINUE THROUGH THE REST OF
THE WEEKEND. A DEEP LOW PRESSURE SYSTEM CARRYING ANOMALOUS
MOISTURE WILL GENERATE HEAVY TO POTENTIALLY EXCESSIVE RAINFALL
OVER PARTS OF THE PACIFIC NORTHWEST COAST. PARTS OF NORTHERN
CALIFORNIA AND SOUTHERN OREGON ARE OF PARTICULAR CONCERN FOR FLASH
FLOODING AS MOST OF THE HEAVY RAINFALL IS LIKELY TO FOCUS OVER
THOSE AREAS THROUGH TONIGHT. THINGS BEGIN TO DRY UP ACROSS THE
NORTHWEST COAST ON SUNDAY. MEANWHILE, HEAVY SNOW IS ALSO LIKELY
OVER PARTS OF THE CASCADES AND NORTHERN/CENTRAL ROCKIES, WHERE
ANYWHERE BETWEEN 1-3 FEET OF SNOW MAY ACCUMULATE BY MONDAY
MORNING, WHEN SNOW INTENSITY WILL BEGIN TO WEAKEN CONSIDERABLY.
ANOTHER AREA OF CONCERN IS THE LOWER MISSISSIPPI VALLEY AND
SOUTHEAST, WHERE A DEVELOPING LOW PRESSURE SYSTEM IS LIKELY TO
GENERATE A SEVERE THUNDERSTORM OUTBREAK TODAY, AS WELL AS HEAVY
RAINFALL THROUGH THE REST OF THE WEEKEND. TODAY, ACCORDING TO THE
STORM PREDICTION CENTER, AN OUTBREAK OF SEVERE STORMS WITH
TORNADOES, WIND DAMAGE, AND LARGE HAIL IS EXPECTED FROM PARTS OF
THE SOUTHERN PLAINS, INTO THE LOWER MISSISSIPPI VALLEY AND CENTRAL
GULF COAST STATES. SEVERAL LONG TRACK TORNADOES ARE EXPECTED.
THUS, A MODERATE RISK (LEVEL 4/5) OF SEVERE THUNDERSTORMS WAS
HOISTED. ADDITIONALLY, A SLIGHT RISK (AT LEAST 15%) OF EXCESSIVE
RAINFALL IS IN EFFECT FOR A SIMILAR AREA TO THE SPC SLIGHT, BUT
EXTENDING FARTHER INTO THE TENNESSEE VALLEY. HEAVY RAINFALL AND
SCATTERED TO SEVERE THUNDERSTORMS SHIFT INTO THE EAST COAST ON
SUNDAY.
TEMPERATURES WILL REMAIN WELL ABOVE AVERAGE FOR MUCH OF THE LOWER
48 THIS WEEKEND. WIDESPREAD HIGH MINIMUM TEMPERATURES MAY BE TIED
OR BROKEN ACROSS MUCH OF THE OHIO VALLEY AND INTERIOR NORTHEAST
TONIGHT FOLLOWED BY THE MID-ATLANTIC/NORTHEAST COAST SUNDAY NIGHT.
TROUGHING AND COOLER CONDITIONS ARE PROJECTED TO RETURN TO THE
WEST EARLY NEXT WEEK.
KEBEDE
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