567
FXUS01 KWBC 200805
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
300 AM EST SAT JAN 20 2024
VALID 12Z SAT JAN 20 2024 - 12Z MON JAN 22 2024
...HEAVY RAIN EXPECTED TO IMPACT NORTHERN TO CENTRAL CALIFORNIA
TODAY AND EARLY MONDAY, WITH HEAVY WET SNOW ALONG THE SIERRA
NEVADA...
..MORE FREEZING RAIN IS FORECAST FOR THE COLUMBIA RIVER BASIN
...ARCTIC AIR WILL DOMINATE THE EASTERN TWO-THIRDS OF THE COUNTRY
WITH LAKE-EFFECT AND UPSLOPE SNOWS REMAINING ACTIVE TODAY...
AS THE LATEST ROUND OF SNOW RAPIDLY DEPARTS THE NORTHEASTERN U.S.,
A LARGE DOME OF ARCTIC HIGH PRESSURE SYSTEM WILL DOMINATE THE
EASTERN TWO-THIRDS OF THE COUNTRY THROUGH THE WEEKEND. WHILE THIS
ARCTIC OUTBREAK WILL NOT BE AS COLD AS THE PREVIOUS ONE, SUB-ZERO
TEMPERATURES WILL REACH AS FAR SOUTH AS MISSOURI AND KANSAS THIS
MORNING. FARTHER SOUTH, BELOW FREEZING TEMPERATURES WILL
OVERSPREAD MUCH OF THE GULF COAST REGION EXCEPT SOUTHERN TEXAS AND
THE SOUTHERN HALF OF THE FLORIDA PENINSULA. WIND CHILL
TEMPERATURES AS LOW AS -20 TO -30 WILL BE COMMON ACROSS THE
NORTHERN PLAINS THIS MORNING. THE FRIGID AIR PASSING OVER THE
RELATIVELY WARM WATERS OF THE GREAT LAKES WILL CONTINUE TO TRIGGER
MORE LAKE-EFFECT SNOW DOWNWIND FROM THE GREAT LAKES TODAY.
ADDITIONAL UPSLOPE SNOW IS ALSO EXPECTED TODAY FROM WEST VIRGINIA
TO SOUTHWESTERN PENNSYLVANIA.
THE CENTER OF THE ARCTIC HIGH PRESSURE SYSTEM IS FORECAST TO SLIDE
EASTWARD AND REACH THE MID-ATLANTIC REGION BY MONDAY MORNING.
WITH NO ADDITIONAL REPLENISHMENT OF ARCTIC AIR FROM CANADA, A
STEADY WARM-UP IS FORECAST FOR THE MID-SECTION OF THE COUNTRY ON
SUNDAY. DEEP RETURN FLOW BEHIND THE HIGH PRESSURE SYSTEM WILL
BEGIN TO SET UP A CHANNEL OF MOISTURE FROM THE GULF OF MEXICO INTO
THE SOUTHERN PLAINS LATE SUNDAY INTO MONDAY. THE CHANCE OF HEAVY
RAIN IS EXPECTED TO INCREASE QUICKLY ACROSS SOUTHERN TEXAS SUNDAY
NIGHT INTO MONDAY MORNING. MEANWHILE, A POTENTIAL OF MIXED
PRECIPITATION AND ICE IS EXPECTED TO SURFACE FARTHER NORTH TOWARD
OKLAHOMA BY MONDAY MORNING.
ALONG THE WEST COAST, MULTIPLE FRONTAL SYSTEMS ARRIVING FROM THE
PACIFIC WILL BRING ACTIVE WEATHER ONSHORE THROUGH THE WEEKEND AND
INTO MONDAY. HEAVY RAIN WILL LIKELY IMPACT NORTHERN CALIFORNIA
ESPECIALLY TODAY, AS WELL AS BY SUNDAY NIGHT INTO MONDAY, WITH
HEAVY WET SNOW EXPECTED TO LINGER ALONG THE SIERRA NEVADA. IN
ADDITION, THE INFLUX OF WARMER AIR ALOFT OVER THE TRAPPED COLD AIR
NEAR THE GROUND WILL SUPPORT MORE ICE/FREEZING RAIN FOR THE
COLUMBIA RIVER BASIN AND ESPECIALLY THE COLUMBIA GORGE FOR THE
NEXT FEW DAYS. MIXED PRECIPITATION WILL BEGIN TO PENETRATE
FURTHER INLAND, REACHING INTO THE FOUR CORNERS BY MONDAY MORNING
AHEAD OF AN UPPER-LEVEL TROUGH. UNSETTLED WEATHER WILL ALSO
CONTINUE ALONG THE COAST OF THE PACIFIC NORTHWEST.
KONG
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