938
FXUS64 KHUN 220601
AFDHUN
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
101 AM CDT WED JUL 22 2026
..NEW NEAR TERM, AVIATION
KEY MESSAGES
UPDATED AT 100 AM CDT TUE JUL 22 2026
- LOW CHANCE FOR A FEW STRONG TO SEVERE STORMS TONIGHT INTO EARLY
WEDNESDAY MORNING ALONG AND AHEAD OF A COLD FRONT (MAINLY IN
SOUTHERN MIDDLE TENNESSEE). GUSTY TO DAMAGING WINDS, FREQUENT
LIGHTNING, AND LOCALLY HEAVY RAINFALL WILL BE THE MAIN THREATS.
- UNSETTLED WEATHER WILL CONTINUE FOR THE REMAINDER OF THE WEEK,
WITH DAILY CHANCES OF SHOWERS AND THUNDERSTORMS, AS A FRONTAL
BOUNDARY REMAINS STATIONARY SOUTH OF THE TENNESSEE VALLEY.
- INTO THE LATE WEEK, LOCALLY HEAVY RAINFALL COULD OCCUR NEAR AND
SOUTH OF THE TENNESSEE RIVER, AS WELL AS NEAR AND EAST OF
INTERSTATE 65 CORRIDOR.
NEAR TERM
(TODAY)
ISSUED AT 100 AM CDT WED JUL 22 2026
THE LINE OF STRONG TO SEVERE STORMS MOVING SOUTH FROM CENTRAL
TENNESSEE CONTINUES TO OVERALL WEAKEN, EXCEPT WHERE IT IS PUSHING
INTO MORE ABUNDANT CAPE IN SW TENNESSEE AND NORTHERN MISSISSIPPI
SBCAPE IN THOSE AREAS STILL 2500 TO 4000 J/KG). NEWEST MESOSCALE
MODELS CONTINUE THIS TREND AS WELL.
THAT BEING SAID, WIND SHEAR OVER 30 KNOTS IS MAINLY IN PLACE NEAR
THE TN/AL BORDER AND FURTHER NORTH. SBCAPE OVER NORTHERN ALABAMA
AND SOUTHERN MIDDLE TENNESSEE IS STILL AROUND 1500 J/KG TO 2000
J/KG (MAINLY NW AL FOR HIGHER SBCAPE). SO, PARAMETERS ARE STILL IN
PLACE OVER SOUTHERN MIDDLE TENNESSEE SUCH THAT A LOW CHANCE
SEVERE THREAT IS STILL IN PLACE. THIS THREAT IN MOST GUIDANCE
SHIFTS EAST WITH TIME AND DISSIPATES TOWARDS OR BEFORE DAYBREAK
ON WEDNESDAY AS WE LOSE MORE INSTABILITY. WE MAY HAVE TO WATCH
LINCOLN, MOORE, AND FRANKLIN COUNTIES IN TN FOR POSSIBLE FLASH
FLOODING THROUGH DAYBREAK GIVEN POTENTIALLY HIGH RAINFALL RATES
THAT COULD BE REALIZED WITH SOME TRAINING OF STRONGER STORMS
POSSIBLE OVER THOSE AREAS. LOWS TONIGHT WILL BE ON THE WARM SIDE
ONLY DROPPING INTO THE LOWER TO MID 70S.
WE SHOULD SEE A LOWER COVERAGE OF SHOWERS AND STORMS (30-40%)
AFTER DAYBREAK IN SOUTHERN MIDDLE TENNESSEE WEDNESDAY MORNING
BEFORE INCREASING IN COVERAGE TO BETWEEN 40 AND 60 PERCENT IN THE
AFTERNOON AND EARLY EVENING HOURS (ESPECIALLY EAST OF THE I-65
CORRIDOR. GIVEN VERY HIGH PWAT VALUES THROUGH THE DAY WELL OVER 2
INCHES, SOME FLASH FLOODING COULD OCCUR IN SOUTHERN MIDDLE
TENNESSEE AND SOME AREAS EAST OF THE I-65 CORRIDOR INTO THE EARLY
EVENING HOURS. HOWEVER, AS WE LOSE STRONGER SHEAR THIS MORNING, NO
ADDITIONAL SEVERE THUNDERSTORM DEVELOPMENT IS EXPECTED.
SHORT TERM
(WEDNESDAY NIGHT THROUGH FRIDAY)
ISSUED AT 933 PM CDT TUE JUL 21 2026
SLIGHTLY COOLER AIR NORTH OF THE FRONT SHOULD FILTER ACROSS THE
AREA WED NIGHT, WITH LOWS A BIT MORE COMFORTABLE FROM THE MID 60S
TO AROUND 70. THE AFORMENTIONED FRONTAL BOUNDARY WILL BECOME
STATIONARY SOUTH OF THE TENNESSEE VALLEY FROM THU INTO THE
UPCOMING WEEKEND. THE PRESENCE OF THIS FRONT WILL KEEP MEDIUM TO
HIGH CHANCES OF SHOWERS/THUNDERSTORMS, MAINLY FOR AREAS SOUTH OF
THE TENNESSEE RIVER AND EAST OF I-65. LOW TO MEDIUM RAIN CHANCES
ARE EXPECTED ELSEWHERE. SOME OF THE SHOWERS MORE TO OUR SOUTH AND
EAST COULD BE LOCALLY HEAVY. HIGH ENOUGH RAINFALL AMOUNTS WILL BE
SUFFICIENT TO WARRANT LOW CHANCES OF EXCESSIVE RAINFALL AND THE
POTENTIAL FOR FLASH FLOODING.
COOLER CONDITIONS WILL BE NOTED THU WITH HIGHS IN THE MID/UPPER
80S. MORE COMFORTABLE LOWS WILL CONTINUE AS WELL THU NIGHT WITH
LOWS IN THE MID 60S TO AROUND 70. A TAD WARMER FRI WITH HIGHS IN
THE MID 80S TO AROUND 90.
LONG TERM
(FRIDAY NIGHT THROUGH TUESDAY)
ISSUED AT 933 PM CDT TUE JUL 21 2026
THE LONG TERM PERIOD WILL LARGELY BE INFLUENCED BY AN UPPER LEVEL
RIDGE AND SUBSEQUENT SFC HIGH PRESSURE SYSTEM LOOMING OVER THE DEEP
SOUTH AND SLOWLY SHIFTING EASTWARD INTO THE LOWER MISSISSIPPI VALLEY.
A FEW FEATURES TO WATCH WILL BE HOW REMNANTS OF TROPICAL STORM BERTHA
INTERACT WITH A COLD FRONT SOUTH OF OUR AREA. HOW THESE TWO FEATURES
INTERACT WILL LARGELY DOMINATE THE FORECAST FOR FRIDAY INTO SUNDAY.
WE CURRENTLY HAVE LOW TO MEDIUM RAINFALL CHANCES THROUGH THAT TIME
PERIOD AND ARE OUTLOOKED FOR A MARGINAL RISK (LEVEL 1 OF 4) FOR FLASH
FLOODING FROM THE WEATHER PREDICTION CENTER. IF THE FRONT SHIFTS OVER
THE AREA AND STALLS, THE FLOODING THREAT WILL INCREASE. HOWEVER,
THERE IS STILL TOO MUCH UNCERTAINTY TO DIVE INTO DETAILS AS IT IS
SEVERAL DAYS OUT. IF YOU HAVE OUTDOOR PLANS EARLY THIS WEEKEND, IT'S
HIGHLY ENCOURAGED TO CHECK BACK IN FOR UPDATES. OTHERWISE, AS THE
AFOREMENTIONED RIDGE SHIFTS EASTWARD, DRY WEATHER SHOULD RETURN TO
THE AREA EARLY NEXT WEEK ALONG WITH A WARMING PATTERN AS HIGHS BEGIN
TO CLIMB BACK INTO THE MID TO UPPER 90S. ADDITIONAL HEAT PRODUCTS
WILL LIKELY NEED TO BE CONSIDERED IF TRENDS CONTINUE.
AVIATION
(06Z TAFS)
ISSUED AT 100 AM CDT WED JUL 22 2026
EXPECT -RA TO BE OCCURRING SHORTLY AFTER 06Z AT BOTH TERMINALS.
THUS, INCLUDED MVFR PREDOMINANT MVFR VSBYS AND -RA THROUGH 10Z AT
BOTH TERMINALS. A TEMPO FOR -TSRA WAS INCLUDED BETWEEN 06Z AND 10Z
FOR BOTH TERMINALS AS WELL. EXPECT THIS ACTIVITY TO BREAK UP AND
MAINLY SCATTERED SHOWERS TO BE AROUND THE TERMINALS AFTER 10Z
(THUS A RETURN TO VFR CONDITIONS), BUT KEPT A PROB30 GROUP FOR
-TSRA IN FROM 10Z TO 13Z WITH MVFR VSBYS A TIMES. EXPECT CLEARING
AROUND 17Z. MORE CONCENTRATED SHOWERS/STORMS MAY SHIFT SOUTHEAST
OF THE TERMINALS BY THE AFTERNOON HOURS. HOWEVER, SCATTERED
ACTIVITY WARRANTS AT LEAST ANOTHER PROB30 GROUP FOR TSRA AND MVFR
VSBYS AT TIMES.
HUN WATCHES/WARNINGS/ADVISORIES
AL...NONE.
TN...NONE.
NEAR TERM...KTW
SHORT TERM....RSB
LONG TERM....HC
AVIATION...KTW
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