875
FXUS01 KWBC 090808
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
400 AM EDT WED SEP 09 2026
VALID 12Z WED SEP 09 2026 - 12Z FRI SEP 11 2026
...HEAVY RAIN AND SEVERE WEATHER THREATS WILL SPREAD FROM THE
MIDWEST THIS MORNING TO INTERIOR NEW ENGLAND TONIGHT...
...PERSISTENT HEAT ACROSS THE SOUTH-CENTRAL U.S. IS FORECAST TO
GET A BREAK ON THURSDAY....
...SHOWERS AND THUNDERSTORMS WILL STRETCH ACROSS THE CENTRAL
PLAINS TO THE MID-ATLANTIC OVER THE NEXT COUPLE OF DAYS WITH
LOCALLY HEAVY RAIN ACROSS THE CENTRAL APPALACHIANS ON THURSDAY...
A LARGE HIGH-PRESSURE SYSTEM SLIDING OFF THE EAST COAST WILL GIVE
WAY TO AN EXPANDING AND INTENSIFYING LOW PRESSURE SYSTEM CURRENTLY
TRACKING EAST ACROSS SOUTHERN CANADA. THE RECENT EPISODE OF FINE
AND COOL LATE-SUMMER WEATHER WILL GIVE WAY TO A RESURGENCE OF HEAT
ACROSS MUCH OF THE EASTERN U.S. MEANWHILE, THE CYCLONE IN SOUTHERN
CANADA WILL SWEEP A COLD FRONT THROUGH THE NORTHERN TIER STATES
OVER THE NEXT COUPLE OF DAYS. AREAS OF HEAVY RAIN AND SEVERE
WEATHER THREATS NEAR AND AHEAD OF THE FRONT WILL SPREAD FROM THE
MIDWEST AND THE LOWER GREAT LAKES THIS MORNING TO INTERIOR NEW
ENGLAND BY TONIGHT. AS THE FRONTAL SYSTEM PUSHES AGAINST THE
PERSISTENT HEAT DOME ACROSS THE SOUTH, EXPECT A STRETCH OF SHOWERS
AND THUNDERSTORMS FROM THE CENTRAL PLAINS THROUGH THE MID-ATLANTIC
OVER THE NEXT COUPLE OF DAYS. LOCALLY HEAVY RAIN IS POSSIBLE
ACROSS THE MID-MISSISSIPPI VALLEY TODAY, FOLLOWED BY THE CENTRAL
APPALACHIANS ON THURSDAY WHEN A COUPLE OF LOW PRESSURE WAVES FORM
ALONG THE FRONT LOSING FORWARD MOMENTUM. THIS FRONT WILL ALSO
BREAK THE UNRELENTING HEATWAVE ACROSS THE SOUTH-CENTRAL U.S. BY
THURSDAY, BRINGING CLOUDS, OCCASIONAL RAIN, AND SOME EMBEDDED
THUNDERSTORMS.
MEANWHILE, MONSOONAL MOISTURE WILL CONTINUE TO SUPPORT MAINLY
LATE-DAY SHOWERS AND THUNDERSTORMS ACROSS ARIZONA AND NEW MEXICO.
SOME THUNDERSTORMS WITH HEAVY RAIN WILL ALSO EXTEND NORTH INTO
COLORADO TODAY IN CONNECTION WITH THE SOUTHERN END OF THE FRONTAL
SYSTEM TRAILING FROM THE CANADIAN CYCLONE. WPC HIGHLIGHTS A SLIGHT
RISK (LEVEL 2/4) OF EXCESSIVE RAINFALL OVER SOUTHEASTERN ARIZONA
INTO SOUTHWESTERN NEW MEXICO FOR TODAY INTO THIS EVENING. THE
ASSOCIATED HEAVY RAIN WILL CREATE MAINLY LOCALIZED AREAS OF FLASH
FLOODING, WITH URBAN AREAS, ROADS, SMALL STREAMS, LOW-LYING AREAS,
AND BURN SCARS BEING THE MOST VULNERABLE.
ELSEWHERE, SHOWERS AND THUNDERSTORMS WILL LINGER ACROSS THE
SOUTHEAST U.S. CLOSER TO THE COAST AND INCLUDING FLORIDA NEAR A
DISSIPATING FRONT. ON THE OPPOSITE SIDE OF THE COUNTRY, FINE AND
DRY WEATHER WILL PREVAIL ACROSS THE NORTHWEST BEFORE THE NEXT
CHANCE OF SHOWERS REACHES THE PACIFIC NORTHWEST BY THURSDAY AS A
COLD FRONT APPROACHES FROM THE NORTHWEST.
KONG/ZIEGENFELDER
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
EXTREME HEAT KEY MESSAGES AVAILABLE AT:
HTTPS://WWW.WPC.NCEP.NOAA.GOV/KEY_MESSAGES/LATESTKEYMESSAGE_1.PNG
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