221
FXUS01 KWBC 170806
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 AM EDT TUE OCT 17 2023
VALID 12Z TUE OCT 17 2023 - 12Z THU OCT 19 2023
...AN ALBERTA CLIPPER WILL BRING VERY GUSTY WINDS AND A ROUND OF
RAIN ACROSS THE NORTHERN PLAINS LATER TODAY AND WEDNESDAY,
SPREADING INTO THE GREAT LAKES WEDNESDAY NIGHT AND EARLY
THURSDAY...
...A WARMING TREND IS IN STORE FOR THE EASTERN HALF OF THE COUNTRY
AS AN EXPANSIVE COOL AIRMASS MODERATES...
...WARM AND DRY AIR ACROSS MUCH OF THE WESTERN U.S. WILL SPREAD
INTO THE PLAINS BUT RAINY CONDITIONS REMAIN OVER THE PACIFIC
NORTHWEST...
THE WEATHER PATTERN THAT HAS BEEN SUSTAINING AN EXPANSIVE AREA OF
COOL AIR MASS ACROSS THE EASTERN HALF OF THE COUNTRY THE PAST FEW
DAYS IS FORECAST TO SLOWLY BREAK DOWN DURING THE NEXT COUPLE OF
DAYS AS AN ALBERTA CLIPPER TRACKS INTO THE NORTHERN PLAINS. BELOW
NORMAL TEMPERATURES THAT HAVE BEEN FELT ACROSS THE CENTRAL TO
EASTERN U.S. WILL GRADUALLY MODERATE AS A HIGH PRESSURE RIDGE
SLIDES EASTWARD TO REACH THE EAST COAST LATER ON WEDNESDAY,
ALLOWING A RESERVOIR OF WARM AIR OVER MUCH OF THE WESTERN U.S. TO
REACH INTO THE GREAT PLAINS. THE WARMING PROCESS WILL BE THE
SLOWEST ACROSS THE SOUTH WHERE THE ASSOCIATED COLD UPPER TROUGH
WILL BE THE LAST TO BREAK DOWN. SCATTERED SHOWERS WILL ONCE AGAIN
BE FOUND FROM INTERIOR NEW ENGLAND TO THE LOWER GREAT LAKES AND
DOWN ACROSS THE OHIO VALLEY THIS MORNING WITH PLENTY OF
CLOUDINESS. A SLOW CLEARING AND WARMING TREND IS EXPECTED THROUGH
THE NEXT COUPLE OF DAYS AS THIS COOL WEATHER PATTERN BREAKS DOWN
FURTHER.
WHILE MUCH OF THE INTERIOR WESTERN U.S. HAS BEEN DRY, MOISTURE
ASSOCIATED WITH A COLD FRONT AHEAD OF AN UPPER TROUGH WILL BRING
WINDY AND RAINY CONDITIONS ACROSS THE PACIFIC NORTHWEST AND DOWN
INTO NORTHWESTERN CALIFORNIA TODAY. THIS LATEST ROUND OF RAIN IS
FORECAST TO END LATER TODAY FROM OREGON SOUTHWARD. FARTHER NORTH
THOUGH, RAINY WEATHER IS EXPECTED TO CONTINUE ACROSS THE OLYMPIC
PENINSULA FOR AT LEAST A COUPLE MORE DAYS WITH THE ARRIVAL OF A
WARM FRONT FROM THE NEXT PACIFIC SYSTEM. MEANWHILE, A PIECE OF
THE LEAD UPPER TROUGH IS PENETRATING FARTHER INLAND, WITH A ROUND
OF RAIN AND HIGH-ELEVATION WET SNOW MOVING ACROSS IDAHO AND
MONTANA THIS MORNING. BY TONIGHT INTO EARLY WEDNESDAY, AN ALBERTA
CLIPPER IS FORECAST TO SLIDE SOUTHEASTWARD INTO THE FAR NORTHERN
PLAINS WHERE A ROUND OF MOSTLY LIGHT RAIN CAN BE EXPECTED. STRONG
WINDS INCLUDING MAXIMUM GUSTS UP TO 60 MPH ARE POSSIBLE LATER
TODAY ACROSS PARTS OF THE NORTHERN HIGH PLAINS. THIS HAS PROMPTED
HIGH WIND WARNINGS TO BE ISSUED FOR PARTS OF NORTHERN AND CENTRAL
MONTANA. ON WEDNESDAY, THE CLIPPER IS FORECAST TO HEAD EAST
TOWARD THE UPPER MIDWEST, SPREADING RAIN INTO THE GREAT LAKES AND
DOWN INTO THE MID-MISSISSIPPI VALLEY BY WEDNESDAY NIGHT AND EARLY
THURSDAY. MEANWHILE, SOUTHERLY FLOW DEVELOPING AHEAD OF THE
ALBERTA CLIPPER AND A LEE TROUGH NEAR THE FOOTHILLS OF THE ROCKIES
WILL ALLOW WARM AIR TO START FILTERING INTO THE HIGH PLAINS TODAY,
RESULTING IN AFTERNOON HIGH TEMPERATURES WELL INTO THE 80S IN THE
AFTERNOON AS DRY CONDITIONS CONTINUE. MEANWHILE, ABOVE NORMAL
TEMPERATURES WILL CONTINUE OVER THE DESERT SOUTHWEST WHERE HIGH
TEMPERATURES COULD TOP THE CENTURY MARK FOR THE NEXT FEW DAYS.
KONG
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