468
FXUS01 KWBC 042004
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 PM EDT THU MAY 04 2023
VALID 00Z FRI MAY 05 2023 - 00Z SUN MAY 07 2023
...THREAT OF SEVERE THUNDERSTORMS OVER THE SOUTHERN PLAINS THROUGH
TONIGHT FOLLOWED BY HEAVY RAIN AND THREAT OF FLASH FLOODING ACROSS
THE TENNESSEE VALLEY ON FRIDAY...
...UNSETTLED WEATHER EXPANDING INTO THE PACIFIC NORTHWEST WILL
PROMOTE SNOWMELT AND FLOODING ACROSS THE INTERIOR SECTIONS WHILE
RAIN AND SOME THUNDERSTORMS EXPAND UP THE NORTHERN PLAINS...
...COOL AFTERNOONS ACROSS THE WESTERN U.S. AND THE MID-ATLANTIC
WILL BE CONTRASTED WITH HIGHS INTO THE LOW 90S IN THE CENTRAL
PLAINS BY SATURDAY...
OVER THE NEXT COUPLE OF DAYS, MUCH OF THE ACTIVE WEATHER WILL BE
FOUND ACROSS THE MID-SECTION OF THE COUNTRY, GRADUALLY SHIFTING
EASTWARD INTO THE SOUTHEASTERN U.S. WHILE UNSETTLED WEATHER WILL
PERSIST ACROSS THE NORTHWEST AND THE NORTHERN PLAINS. THIS IS IN
RESPONSE TO A SLOW-MOVING UPPER TROUGH INTERACTING WITH A COUPLE
OF SLOW-MOVING FRONTAL BOUNDARIES. THE FRONTAL BOUNDARY CURRENTLY
ACROSS THE SOUTHERN PLAINS WILL BE RESPONSIBLE FOR A THREAT OF
SEVERE THUNDERSTORMS OVER THE SOUTHERN PLAINS THROUGH TONIGHT AS
IT LIFTS EVER SO SLOWLY NORTHEASTWARD. BY FRIDAY, THE
THUNDERSTORMS ARE FORECAST TO REACH INTO THE LOWER TO
MID-MISSISSIPPI VALLEY AS A LOW PRESSURE WAVE DEVELOPS ON THE
FRONT OVER THE CENTRAL PLAINS. HEAVY RAIN WILL LIKELY EXPAND
EASTWARD ACROSS THE MID-MISSISSIPPI VALLEY INTO THE TENNESSEE
VALLEY FRIDAY AND FRIDAY NIGHT AHEAD OF THE LOW PRESSURE WAVE
WHERE THE HEAVY RAIN MAY LEAD TO FLASH FLOODING. BY SATURDAY, THE
THREAT OF HEAVY RAIN SHOULD DECREASE AS THE RAIN CONTINUES ITS
EASTWARD MOVEMENT INTO THE CAROLINAS. MEANWHILE, THUNDERSTORM
CLUSTERS ARE FORECAST TO ORGANIZE ACROSS THE LOWER MISSISSIPPI
VALLEY BEHIND THE WARM FRONT, AND OVER CENTRAL TEXAS AHEAD OF A
DRY LINE.
MEANWHILE, UNSETTLED WEATHER WILL CONTINUE EXPANDING INTO THE
PACIFIC NORTHWEST UNDER MOIST SOUTHWESTERLY FLOW AHEAD OF THE
WESTERN U.S. UPPER TROUGH. THE MOISTURE WILL INTERACT WITH A
STATIONARY FRONT NEAR THE NORTHERN SLOPES OF THE NORTHERN ROCKIES.
THE HEAVIEST RAINS ARE FORECAST ACROSS THE LOWER TO MID
ELEVATIONS OF THE INTERIOR MOUNTAINS ACROSS IDAHO AND PORTIONS OF
NEARBY STATES TONIGHT INTO EARLY FRIDAY WHERE SNOWMELT WILL
PROMOTE FLOODING ACROSS THE REGION. WET SNOW WILL BE CONFINED TO
THE HIGHEST ELEVATION AS WELL AS ACROSS NORTHWESTERN WYOMING. FOR
THE REST OF FRIDAY INTO EARLY SATURDAY, THE FOCUS OF MODERATE TO
LOCALLY HEAVY RAIN WILL SHIFT NORTHEASTWARD FROM THE NORTHERN
ROCKIES INTO THE NORTHERN HIGH PLAINS WHILE MODERATE TO LOCALLY
HEAVY RAIN AND SOME THUNDERSTORMS EXPAND UP THE NORTHERN PLAINS AS
THE STATIONARY FRONT LIFTS NORTHWARD AS A WARM FRONT. MUCH OF THE
NORTHWEST AND INTO NORTHERN CALIFORNIA WILL SEE UNSETTLED WEATHER
CONTINUING INTO THE WEEKEND.
TEMPERATURE-WISE, COOL AFTERNOONS WILL PREVAIL ACROSS THE WESTERN
U.S. UNDER THE UPPER TROUGH AS WELL AS THE MID-ATLANTIC BEHIND
ANOTHER UPPER TROUGH. IN CONTRAST, AN UPPER RIDGE IS FORECAST TO
BUILD ACROSS THE MID-SECTION OF THE COUNTRY WHERE HIGH
TEMPERATURES ARE FORECAST TO REACH INTO THE LOW 90S BY SATURDAY.
KONG
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