362
FXUS01 KWBC 081959
PMDSPD
SHORT RANGE FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
358 PM EDT THU OCT 08 2026
VALID 00Z FRI OCT 09 2026 - 00Z SUN OCT 11 2026
...RAPIDLY STRENGTHENING HURRICANE ISAIAS THREATENS THE NORTHERN
GULF COAST (MISSISSIPPI TO FLORIDA PANHANDLE) WITH DESTRUCTIVE
WINDS, SEVERE STORM SURGE, AND TORRENTIAL RAIN BY LATE FRIDAY...
...SUBSTANTIAL COOLING IS ON THE WAY AS A MAJOR PATTERN SHIFT
FINALLY BREAKS THE PROLONGED OCTOBER HEATWAVE ACROSS CENTRAL AND
SOUTHERN CALIFORNIA BY FRIDAY...
...HIGH-ELEVATION WET SNOW COULD REACH THE CANADIAN BORDER OF
MONTANA AND WASHINGTON BY EARLY SATURDAY MORNING...
AN ACTIVE WEATHER PATTERN IS SET TO UNFOLD THIS WEEKEND AS
TROPICAL DEVELOPMENT CONTINUES TO PROGRESS. HURRICANE ISAIAS, THE
2026 ATLANTIC SEASON'S INAUGURAL STORM, STRENGTHENED OVER THE WARM
GULF WATERS NORTHWEST OF THE YUCATÃN PENINSULA AND IS PROJECTED
TO INTENSIFY FURTHER AHEAD OF A FRIDAY EVENING LANDFALL. THE
SYSTEM THREATENS THE REGION FROM THE WESTERN FLORIDA PANHANDLE TO
SOUTHERN AND CENTRAL ALABAMA AND MISSISSIPPI, AND SOUTHWESTERN
GEORGIA WITH DESTRUCTIVE HURRICANE-FORCE WINDS, SEVERE STORM
SURGE, AND TORRENTIAL DOWNPOURS. HURRICANE WARNINGS AND TROPICAL
STORM WARNINGS ARE CURRENTLY IN EFFECT FROM AS FAR WEST AS EXTREME
EASTERN LOUISIANA TO AS FAR EAST AS THE BIG BEND REGION OF THE
FLORIDA PANHANDLE. A STORM SURGE WARNING IS ALSO IN EFFECT FOR
THESE AREAS, AND A TROPICAL STORM WATCH HAS EXPANDED FAR INLAND
ACROSS PARTS OF MISSISSIPPI, ALABAMA AND GEORGIA. FLOOD WATCHES
ARE NOW IN EFFECT FOR NORTHERN PORTIONS OF MISSISSIPPI, ALABAMA,
GEORGIA, AND MUCH OF WESTERN AND CENTRAL TENNESSEE.
AS HURRICANE ISAIAS APPROACHES LANDFALL, INTERACTION WITH A
STATIONARY FRONTAL BOUNDARY ACROSS FLORIDA AND AN UPPER LEVEL
PATTERN WILL AID ISAIAS IN TRANSITIONING FROM ITS TROPICAL
CHARACTERISTICS TO AN EXTRATROPICAL CYCLONE, HELPING TO DISPLACE
THE HEAVIEST MOISTURE TO THE EASTERN PERIPHERY OF THE STORM. THE
WEATHER PREDICTION CENTER (WPC) HAS OUTLINED A MODERATE RISK OF
EXCESSIVE RAINFALL (LEVEL 3 OF 4) FOR WESTERN FLORIDA PANHANDLE
AND SOUTHERN ALABAMA AND A SLIGHT RISK (LEVEL 2 OF 4) FARTHER
INLAND INTO MISSISSIPPI, ALABAMA, AND GEORGIA THROUGH SATURDAY
MORNING, WITH COASTAL ZONES EXPECTED TO RECEIVE 5 INCHES OR MORE
OF RAIN.
BY SATURDAY, ISAIAS IS EXPECTED TO PUSH INLAND OVER CENTRAL
ALABAMA. ALTHOUGH IT WILL BEGIN TRANSITIONING AWAY FROM TROPICAL
CHARACTERISTICS, THE EXPANDING SYSTEM WILL MAINTAIN ITS LARGE
FOOTPRINT, DELIVERING SEVERE WEATHER, TROPICAL STORM FORCE GUSTS,
AND WIDESPREAD HEAVY RAIN DEEP INTO PARTS OF THE DEEP SOUTH. IN
ADDITION, THE STORM PREDICTION CENTER (SPC) HAS OUTLINED A SLIGHT
RISK (LEVEL 2 OF 5 ) FOR SEVERE WEATHER FOR THE WESTERN FLORIDA
PANHANDLE AND THE INTERIOR OF SOUTHERN ALABAMA AND GEORGIA RIGHT
INTO SATURDAY. THE MAIN THREAT IS FOR ISOLATED TORNADOES AS SOME
CELLS WILL BE STRONG ENOUGH TO BECOME SUPERCELL THUNDERSTORMS DUE
TO LOW LEVEL WIND SHEAR. AT THE SAME TIME, LINGERING SHOWERS AND
THUNDERSTORMS WILL PERSIST OVER THE FLORIDA PENINSULA AS THE FRONT
LIFTS NORTHWARD. WPC WILL CONTINUE TO COLLABORATE WITH THE
NATIONAL HURRICANE CENTER (NHC) ON THE RAINFALL ASPECTS OF ISAIAS.
PLEASE REFER TO THE NHC FOR THE LATEST FORECAST TRACK ON ISAIAS AT
HTTPS://WWW.NHC.NOAA.GOV.
MEANWHILE, A LONG-DURATION OCTOBER HEATWAVE ACROSS PORTIONS OF
CALIFORNIA AND THE DESERT SOUTHWEST IS SHOWING SIGNS OF EASING AS
A MAJOR SHIFT IN THE UPPER-AIR PATTERN IS IN STORE FOR THE WESTERN
U.S. HIGH TEMPERATURES THIS AFTERNOON IN THE CENTRAL VALLEY OF
CALIFORNIA ARE FORECAST TO BE BELOW THE CENTURY MARK BUT THEY WILL
BE HIGH ENOUGH TO ONCE AGAIN CHALLENGE DAILY HIGH TEMPERATURE
RECORDS. FROM FRIDAY INTO THE WEEKEND, A MAJOR DIP IN THE JET
STREAM WILL BRING A SURGE OF MUCH COLDER AIR THROUGH THE PACIFIC
NORTHWEST. THIS TROUGH WILL ALLOW THE HEAT TO MODERATE ACROSS THE
SOUTHWEST BUT TEMPERATURES WILL REMAIN ABOVE NORMAL INTO THE
WEEKEND. A STRONG LOW PRESSURE SYSTEM IS FORECAST TO FORM IN
WESTERN CANADA AND SPREAD THE WARM AIR MASS INTO THE NORTHERN HIGH
PLAINS ON FRIDAY WITH HIGHS NEAR 90 DEGREES POSSIBLE ALONG WITH
GUSTY WINDS. BY SATURDAY MORNING, HIGH-ELEVATION WET SNOW COULD
REACH THE CANADIAN BORDER OF MONTANA AND WASHINGTON BEHIND A
POTENT COLD FRONT AND ENHANCED BY MOISTURE FROM TROPICAL STORM
RACHEL IN THE EASTERN PACIFIC BASIN.
LASTLY, THE EAST COAST AND NORTHEAST STARTED OUT WITH COOLER,
BELOW-AVERAGE CONDITIONS TODAY, TEMPERATURES ARE CURRENTLY
REBOUNDING INTO COMFORTABLE 70S FOR MOST SPOTS AHEAD OF A BRIEF
INTRUSION OF COOLER AIR THAT WILL PUSH INTO INTERIOR NEW ENGLAND
BY FRIDAY AND LINGER THROUGH THE WEEKEND, ALL AS A COLD FRONTAL
SYSTEM TRACKS OFF THE MID-ATLANTIC AND NORTHEAST COAST TONIGHT.
ACROSS THE REST OF THE COUNTRY, DRY, TRANQUIL WEATHER WILL LARGELY
DOMINATE INTO THE WEEKEND, THOUGH A FEW EXCEPTIONS INCLUDE
SCATTERED SHOWERS OVER THE CENTRAL ROCKIES AND FOUR CORNERS AND A
FRESH ROUND OF SHOWERS DEVELOPING OVER THE NORTH-CENTRAL PLAINS
EARLY FRIDAY MORNING.
GREEN/KONG
GRAPHICS AVAILABLE AT
HTTPS://WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP
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