726
WTNT34 KNHC 100552
TCPAT4
BULLETIN
POST-TROPICAL CYCLONE ISAIAS INTERMEDIATE ADVISORY NUMBER 14A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092026
100 AM CDT SAT OCT 10 2026
..ISAIAS MOVING OVER SOUTHERN ALABAMA
..FLASH FLOODING AND STRONG WIND THREAT SPREADS FARTHER INLAND
SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
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LOCATION...31.5N 86.5W
ABOUT 80 MI...130 KM NNE OF PENSACOLA FLORIDA
ABOUT 55 MI...90 KM SSW OF MONTGOMERY ALABAMA
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...N OR 355 DEGREES AT 20 MPH...31 KM/H
MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
THE STORM SURGE WARNING WEST OF SANTA ROSA/OKALOOSA COUNTY LINE HAS
BEEN DISCONTINUED.
THE HURRICANE WARNING WEST OF THE ALABAMA/FLORIDA LINE HAS BEEN
DISCONTINUED.
THE HURRICANE WARNING FROM EAST OF THE ALABAMA/FLORIDA LINE TO THE
BAY/GULF COUNTY LINE, FL HAS BEEN CHANGED TO A TROPICAL STORM
WARNING.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A STORM SURGE WARNING IS IN EFFECT FOR...
* SANTA ROSA/OKALOOSA COUNTY LINE TO THE SUWANNEE RIVER
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* EAST OF ALABAMA/FLORIDA LINE TO AUCILLA RIVER, FL
A STORM SURGE WARNING MEANS THERE IS A DANGER OF LIFE-THREATENING
INUNDATION, FROM RISING WATER MOVING INLAND FROM THE COASTLINE. FOR
A DEPICTION OF AREAS AT RISK, PLEASE SEE THE NATIONAL WEATHER
SERVICE STORM SURGE WATCH/WARNING GRAPHIC, AVAILABLE AT
HURRICANES.GOV. THIS IS A LIFE-THREATENING SITUATION. PERSONS
LOCATED WITHIN THESE AREAS SHOULD TAKE ALL NECESSARY ACTIONS TO
PROTECT LIFE AND PROPERTY FROM RISING WATER AND THE POTENTIAL FOR
OTHER DANGEROUS CONDITIONS. PROMPTLY FOLLOW EVACUATION AND OTHER
INSTRUCTIONS FROM LOCAL OFFICIALS.
A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA.
FOR STORM INFORMATION SPECIFIC TO YOUR AREA, INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS, PLEASE MONITOR PRODUCTS ISSUED BY YOUR
LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE.
DISCUSSION AND OUTLOOK
----------------------
AT 100 AM CDT (0600 UTC), THE CENTER OF POST-TROPICAL CYCLONE ISAIAS
WAS LOCATED NEAR LATITUDE 31.5 NORTH, LONGITUDE 86.5 WEST. THE
POST-TROPICAL CYCLONE IS MOVING TOWARD THE NORTH NEAR 20 MPH (31
KM/H), AND THIS GENERAL MOTION IS EXPECTED TODAY. A MOTION TOWARD
THE NORTH-NORTHEAST OR NORTHEAST IS FORECAST ON SUNDAY. ON THE
FORECAST TRACK, ISAIAS IS EXPECTED TO MOVE ACROSS ALABAMA AND INTO
THE TENNESSEE VALLEY LATER TODAY AND SUNDAY.
MAXIMUM SUSTAINED WINDS HAVE DECREASED TO NEAR 65 MPH (100 KM/H)
WITH HIGHER GUSTS. CONTINUED WEAKENING IS EXPECTED, BUT ISAIAS IS
EXPECTED TO CONTINUE PRODUCING GUSTY WINDS WELL INLAND BEFORE
WEAKENING BELOW GALE FORCE LATER TODAY.
TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 160 MILES (260 KM)
FROM THE CENTER.
THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1000 MB (29.53 INCHES).
HAZARDS AFFECTING LAND
----------------------
KEY MESSAGES FOR ISAIAS CAN BE FOUND IN THE TROPICAL CYCLONE
DISCUSSION UNDER AWIPS HEADER MIATCDAT4 AND WMO HEADER WTNT44 KNHC.
STORM SURGE: THE COMBINATION OF A DANGEROUS STORM SURGE AND THE
TIDE WILL CAUSE NORMALLY DRY AREAS NEAR THE COAST TO BE FLOODED BY
RISING WATERS MOVING INLAND FROM THE SHORELINE. THE WATER COULD
REACH THE FOLLOWING HEIGHTS ABOVE GROUND SOMEWHERE IN THE INDICATED
AREAS IF THE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE...
SANTA ROSA/OKALOOSA COUNTY LINE, FL TO SUWANNEE RIVER, FL...2-4 FT
THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST IN AREAS OF
ONSHORE WINDS, WHERE THE SURGE WILL BE ACCOMPANIED BY LARGE AND
DANGEROUS WAVES. SURGE-RELATED FLOODING DEPENDS ON THE RELATIVE
TIMING OF THE SURGE AND THE TIDAL CYCLE, AND CAN VARY GREATLY OVER
SHORT DISTANCES. FOR INFORMATION SPECIFIC TO YOUR AREA, PLEASE SEE
PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST
OFFICE.
FOR A COMPLETE DEPICTION OF AREAS AT RISK OF STORM SURGE INUNDATION,
PLEASE SEE THE NATIONAL WEATHER SERVICE PEAK STORM SURGE GRAPHIC,
AVAILABLE AT HURRICANES.GOV/GRAPHICS_AT4.SHTML?PEAKSURGE.
WIND: TROPICAL STORM CONDITIONS ARE ONGOING IN THE TROPICAL STORM
WARNING AREA FOR THE NEXT SEVERAL HOURS.
RAINFALL: THROUGH THE WEEKEND, ISAIAS IS EXPECTED TO PRODUCE
RAINFALL AMOUNTS OF 4 TO 8 INCHES ACROSS SOUTHERN ALABAMA, THE
FLORIDA PANHANDLE AND BIG BEND, AND SOUTHWEST GEORGIA. LOCALIZED
TOTALS UP TO 15 INCHES ARE POSSIBLE, PARTICULARLY WITHIN BANDING
ACROSS THE FLORIDA PANHANDLE AND BIG BEND.
ACROSS MUCH OF THE REMAINDER OF THE SOUTHEAST, RAINFALL AMOUNTS OF 2
TO 5 INCHES ARE EXPECTED. LOCALIZED HIGHER AMOUNTS UP TO 10 INCHES
ARE POSSIBLE, ESPECIALLY ACROSS THE SOUTHERN APPALACHIANS AND
COASTAL CAROLINAS.
FLASH, URBAN, AND RIVER FLOODING IS POSSIBLE ACROSS THE REGION, WITH
CONSIDERABLE IMPACTS LIKELY ACROSS MUCH OF SOUTHERN ALABAMA AND THE
FLORIDA PANHANDLE INTO SOUTHWESTERN GEORGIA. CONSIDERABLE FLASH
FLOODING AND LANDSLIDES ARE ALSO POSSIBLE ACROSS THE SOUTHERN
APPALACHIANS.
FOR A COMPLETE DEPICTION OF FORECAST RAINFALL ASSOCIATED WITH
ISAIAS, PLEASE SEE THE NATIONAL WEATHER SERVICE STORM TOTAL RAINFALL
GRAPHIC AVAILABLE AT
HURRICANES.GOV/GRAPHICS_AT4.SHTML?RAINQPF AND THE FLASH FLOOD RISK
GRAPHIC AT HURRICANES.GOV/GRAPHICS_AT4.SHTML?ERO.
TORNADOES: A RISK FOR TORNADOES WILL PERSIST OVERNIGHT ACROSS THE
FLORIDA PANHANDLE AND NORTH FLORIDA INTO SOUTHERN GEORGIA. THE
TORNADO THREAT WILL CONTINUE TODAY ACROSS PARTS OF THE FLORIDA
PANHANDLE, GEORGIA, AND THE CAROLINAS.
SURF: SWELLS FROM ISAIAS ARE AFFECTING MUCH OF THE GULF COASTS OF
THE UNITED STATES, MEXICO, AND WESTERN CUBA. THESE SWELLS ARE
LIKELY TO CAUSE LIFE-THREATENING SURF AND RIP CURRENT CONDITIONS.
PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE.
A DEPICTION OF RIP CURRENT RISK FOR THE UNITED STATES CAN BE FOUND
AT: HURRICANES.GOV/GRAPHICS_AT4.SHTML?RIPCURRENTS
NEXT ADVISORY
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NEXT COMPLETE ADVISORY AT 400 AM CDT.
FORECASTER BLAKE
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