452
FXUS64 KHUN 090300
AFDHUN
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1000 PM CDT THU OCT 8 2026
..NEW NEAR TERM, SHORT TERM, LONG TERM
KEY MESSAGES
UPDATED AT 1107 AM CDT THU OCT 8 2026
- HURRICANE ISAIAS WILL MAKE LANDFALL ON THE GULF COAST LATE
FRIDAY NIGHT AND BRING HIGH CHANCES FOR IMPACTFUL GUSTY WINDS
UP TO 50 MPH, A MEDIUM CHANCE FOR FLASH FLOODING, AND A LOW
CHANCE FOR TORNADOES SATURDAY MORNING THROUGH SATURDAY EVENING.
- A HIGH WIND WATCH IS IN EFFECT FROM 7 AM SATURDAY TO 7 AM
SUNDAY.
- A FLOOD WATCH IS IN EFFECT FROM 1 AM SATURDAY TO 7 AM SUNDAY.
NEAR TERM
(REST OF TONIGHT AND FRIDAY)
ISSUED AT 1000 PM CDT THU OCT 8 2026
INITIAL CIRRUS PLUME FROM HURRICANE ISAIAS HAS MOVED IN AND
CREATED PARTLY TO MOSTLY CLOUDY CONDITIONS ACROSS THE AREA. THESE
CLOUDS WILL HELP KEEP TEMPERATURES A LITTLE BIT WARMER OVERNIGHT,
WITH LOWS LIKELY REMAINING IN THE LOW TO MID 60S IN MOST
LOCATIONS. THE CLOUDS (ESPECIALLY ACROSS OUR WESTERN AREAS) MAY
THIN TEMPORARILY AT TIMES ON FRIDAY. THIS WILL ALLOW FOR ENOUGH
HEATING TO PUSH HIGHS INTO THE MID TO UPPER 80S ACROSS MUCH OF THE
AREA BY THE AFTERNOON. AS ISAIAS APPROACHES THE COAST FRIDAY
AFTERNOON, DENSE CLOUD COVER WILL RETURN AND WINDS WILL INCREASE
AS THE APPROACHING TROPICAL CYCLONE BEGINS TO INTERACT WITH A
SHORTWAVE TROUGH PIVOTING INTO THE LOWER MISSISSIPPI VALLEY. THIS
WILL LIKELY RESULT IN SOME BREEZY CONDITIONS BY THE AFTERNOON AS
SOUTHERLY WINDS BETWEEN 10-20 MPH ARE EXPECTED. THE BRUNT OF
ISAIAS'S IMPACT WILL OCCUR LATE FRIDAY NIGHT THROUGH SATURDAY
NIGHT. RESIDENTS OF THE TENNESSEE VALLEY SHOULD USE THE TIME THEY
HAVE ON FRIDAY TO PREPARE FOR THE STRONG GRADIENTS WINDS AND HEAVY
RAINFALL FORECAST TO OCCUR ON SATURDAY. MORE ON THIS IN THE
SECTION BELOW.
SHORT TERM
(FRIDAY NIGHT THROUGH SUNDAY)
ISSUED AT 1000 PM CDT THU OCT 8 2026
ISAIAS WILL MAKE LANDFALL LATE FRIDAY EVENING INTO FRIDAY NIGHT
ALONG THE AL OR FL COASTLINE AND ACCELERATE NORTHWARD DUE TO ITS
INTERACTION WITH A SHORTWAVE TROUGH PIVOTING INTO THE LOWER
MISSISSIPPI VALLEY. THOUGH THE STRONG WESTERLY WIND SHEAR WILL
ERODE ITS TROPICAL CHARACTERISTICS AS IT MOVES INLAND, IT WILL
SERVE TO EXPAND THE GRADIENT WIND FIELD AND THE PRECIPITATION
FIELD AHEAD OF THE REMNANT CENTER OF ISAIAS. THUS, RAINFALL WILL
LIKELY BE MOVING INTO THE PARTS OF THE AREA LATE FRIDAY EVENING
AND ESPECIALLY AFTER MIDNIGHT, EXPANDING QUICKLY FROM SOUTH TO
NORTH. ADDITIONALLY, SOME GRADIENT WIND GUSTS IN THE 20-30 MPH
RANGE WILL BEGIN TO EXPAND ACROSS THE AREA, ESPECIALLY IN THE
PREDAWN HOURS AS THE SYSTEM PROGRESSES INTO WEST CENTRAL ALABAMA.
SATURDAY WILL BE A VERY WINDY/RAINY DAY ACROSS THE TENNESSEE
VALLEY AS THE REMNANT CENTER OF ISAIAS TRACKS NORTHWARD INTO THE
TENNESSEE VALLEY AND MID SOUTH FROM THE MID/LATE MORNING THROUGH
THE AFTERNOON. THIS IS WHERE THE EXACT LANDFALL POINT OF ISAIAS
WILL BE CRITICAL AS IT WILL BE INITIALLY SWUNG NORTHWESTWARD AS IT
INTERACTS WITH THE TROUGH. EARLIER GUIDANCE THIS MORNING SUGGESTED
A COASTAL ALABAMA LANDFALL, MEANING THE THE REMNANT CENTER MAY
TRACK MORE TO THE NORTHWEST AND INTO PORTIONS OF EAST CENTRAL AND
NORTHEASTERN MISSISSIPPI ON SATURDAY. THIS TRACK WOULD
POTENTIALLY PLACE US WOULD PLACE US IN A MORE FAVORABLE LOCATION
FOR LOCALLY HEAVY RAINFALL AND AT LEAST A LOW TORNADO THREAT (IF
ANY DESTABILIZATION CAN OCCUR) FROM THE MID/LATE MORNING INTO THE
AFTERNOON ON SATURDAY. GUIDANCE LATER THIS AFTERNOON/EVENING,
INDICATED A WESTERN FLORIDA PANHANDLE LANDFALL AND TOOK THE
REMNANT CENTER OF ISAIAS OVER PORTIONS OF WEST CENTRAL AND
NORTHWEST ALABAMA (CLOSEST TO WHERE THE 03Z NHC TRACK CURRENTLY
HAS IT), POTENTIALLY LIMITING THE TORNADO THREAT SLIGHTLY.
REGARDLESS, RESIDENTS OF THE TENNESSEE VALLEY SHOULD BE AWARE OF
THIS CONDITIONAL, LOW THREAT FOR TORNADOES ON SATURDAY AND HAVE
MULTIPLE WAYS TO GET WARNINGS IN CASE THIS THREAT MATERIALIZES.
WHAT WE DO HAVE EXTREMELY HIGH CONFIDENCE IN IS THAT THE STRONG
GRADIENT WIND FIELD WILL REMAIN A SIGNIFICANT CONCERN SATURDAY AND
SATURDAY NIGHT AS THE SYSTEM PUSHES NNE ACROSS THE TENNESSEE
VALLEY AND INTO THE CENTRAL/SOUTHERN APPALACHIANS. GUSTY WINDS
WELL WITHIN THE 30-50 MPH RANGE SEEM PLAUSIBLE AND DEPENDING ON
WERE THE CENTER OF THE REMNANT INNER CORE OF ISAIAS GOES, SOME
LOCALIZED HIGHER GUSTS WOULD BE ON THE TABLE IF STRONGER WINDS
ALOFT CAN MIX DOWN. A HIGH WIND WATCH IS IN EFFECT FROM 7 AM
SATURDAY TO 7 AM SUNDAY TO HIGHLIGHT THIS CONCERN AND WE WILL
CONTINUE TO MONITOR TRENDS FOR ON WHETHER AN ADVISORY OR HIGH WIND
WARNING IS NEEDED FOR THE AREA AS WE APPROACH THE EVENT.
REGARDING THE FLOODING POTENTIAL, HI-RES GUIDANCE CONTINUES TO
SHOW THE POTENTIAL FOR SOME INTENSE RAIN BANDS (NORTH TO SOUTH)
TO FORM AS THE SYSTEM MOVES NORTH ON SATURDAY. GIVEN THE DEEP
MOISTURE ASSOCIATED WITH ANY TROPICAL SYSTEM, WIDESPREAD RAINFALL
AMOUNTS OF 2-4" ARE ALREADY FORECAST, DESPITE THE FAST MOVEMENT OF
THE SYSTEM. SHOULD THE EVENTUAL LANDFALL POINT AND INLAND TRACK
FAVOR THESE TROPICAL RAINBANDS MOVING OVER OUR AREA DURING THE
LATE MORNING/AFTERNOON, LOCALLY HIGHER AMOUNTS OF RAINFALL UP TO
5-7" MAY OCCUR. THESE RAINS WOULD ALMOST CERTAINLY CAUSE SOME
SIGNIFICANT FLASH FLOODING ISSUES AND IT'S SOMETHING WE'LL BE
WATCHING CLOSELY FOR ON SATURDAY. FOR THIS REASON, A FLOOD WATCH
IS IN EFFECT FROM 1 AM SATURDAY TO 7 AM SUNDAY.
IN SUMMARY, RESIDENTS OF THE TENNESSEE VALLEY SHOULD BE AWARE AND
PREPARED FOR AN IMPACTFUL WEATHER DAY SATURDAY INTO SATURDAY
NIGHT, WITH VERY WIND/RAINY CONDITIONS FORECAST. PLEASE STAY
TUNED AND UP TO DATE ON THE LATEST FORECAST INFORMATION, ESPECIALLY
IF THEY HAVE TRAVEL PLANS THIS WEEKEND! BE PREPARED FOR POWER
OUTAGES AND MAKE SURE YOU HAVE YOUR EMERGENCY KITS/SUPPLIES READY.
BY SUNDAY THE SYSTEM WILL BE PULLING AWAY FROM THE REGION AND
MOVING WELL NORTH INTO THE CENTRAL APPALACHIANS. BREEZY
CONDITIONS WILL LIKELY PERSIST DURING THE DAY, HOWEVER, WITH
CLOUDS FINALLY CLEARING BY LATE IN THE DAY. FOR THIS REASON,
HIGHS WILL BE NOTABLY COOLER IN THE MID/UPPER 70S.
LONG TERM
(SUNDAY NIGHT THROUGH THURSDAY)
ISSUED AT 1000 PM CDT THU OCT 8 2026
HIGH PRESSURE WILL BUILD IN FOR MUCH OF THE UPCOMING WEEK -- A
STARK CHANGE FROM WHAT WE'LL BE EXPERIENCING THIS WEEKEND. AS A
RESULT, BEAUTIFUL AUTUMN WEATHER WILL AGAIN BE ON TAP ACROSS THE
AREA THROUGH MUCH OF THE UPCOMING WEEK. WITH AMPLE SUNSHINE AND
DRY CONDITIONS HIGHS WILL RETURN TO THE 80S AND OVERNIGHT LOWS
DROP INTO THE 50S.
AVIATION
(00Z TAFS)
ISSUED AT 620 PM CDT THU OCT 8 2026
VFR CONDITIONS WILL CONTINUE FOR THE NEXT 24 HOURS AS HIGH CIRRUS
STREAM INTO THE REGION WELL AHEAD OF APPROACHING HURRICANE ISAIAS
OVER THE GULF. WINDS WILL GRADUALLY VEER TO THE SOUTH AND INCREASE
TO AROUND 10 KTS BY LATE MORNING ON FRIDAY.
HUN WATCHES/WARNINGS/ADVISORIES
AL...FLOOD WATCH FROM LATE FRIDAY NIGHT THROUGH SUNDAY MORNING FOR
ALZ001>010-016.
HIGH WIND WATCH FROM SATURDAY MORNING THROUGH SUNDAY MORNING FOR
ALZ001>010-016.
TN...FLOOD WATCH FROM LATE FRIDAY NIGHT THROUGH SUNDAY MORNING FOR
TNZ076-096-097.
HIGH WIND WATCH FROM SATURDAY MORNING THROUGH SUNDAY MORNING FOR
TNZ076-096-097.
NEAR TERM...AMP.24
SHORT TERM....AMP.24
LONG TERM....AMP.24
AVIATION...AMP.24
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