352
FXUS01 KWBC 172001
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 PM EDT TUE OCT 17 2023
VALID 00Z WED OCT 18 2023 - 00Z FRI OCT 20 2023
...AN ALBERTA CLIPPER WILL BRING VERY GUSTY WINDS AND A ROUND OF
RAIN ACROSS THE NORTHERN PLAINS THROUGH 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 WHILE 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. 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, 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. 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 TONIGHT 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. SHOWERS AND ISOLATED THUNDERSTORMS SPREAD INTO
THE MIDWEST/OHIO VALLEY ON THURSDAY AND SCATTERED THUNDERSTORMS
DEVELOP ACROSS THE TENNESSEE/LOWER MISSISSIPPI VALLEY ALONG THE
COLD FRONT ASSOCIATED WITH THE ALBERTA CLIPPER.
MEANWHILE, SOUTHERLY FLOW DEVELOPING AHEAD OF THE ALBERTA CLIPPER
AND A LEE TROUGH NEAR THE FOOTHILLS OF THE ROCKIES WILL ALLOW WARM
AIR TO FILTER INTO THE HIGH PLAINS. ABOVE NORMAL TEMPERATURES WILL
CONTINUE OVER THE DESERT SOUTHWEST WHERE HIGH TEMPERATURES COULD
TOP THE CENTURY MARK FOR THE NEXT FEW DAYS. RIDGING ACROSS THE
WEST WILL ALSO SUPPORT POTENTIALLY WIDESPREAD RECORD BREAKING WARM
TEMPERATURES ACROSS THE REGION THIS THURSDAY AND FRIDAY.
KEBEDE/KONG
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