935
FXUS64 KJAN 072334 AAA
AFDJAN
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE JACKSON MS
634 PM CDT MON SEP 7 2026
..NEW AVIATION
KEY MESSAGES
- THERE IS A MARGINAL RISK (LEVEL 1 OF 5) FOR SEVERE STORMS THIS
AFTERNOON INTO THE EVENING ALONG AND SOUTH OF I-20.
- DANGEROUS HEAT STRESS WILL PERSIST ACROSS MOST OF THE AREA THIS
AFTERNOON AND AGAIN ACROSS THE WESTERN HALF OF THE AREA ON
TUESDAY.
DISCUSSION
ISSUED AT 159 PM CDT MON SEP 7 2026
A CUMULUS FIELD HAS DEVELOPED THIS AFTERNOON IN TWO AREAS -
ACROSS CENTRAL LA AND SOUTH MS AND ACROSS EAST CENTRAL MS. MUCH
LIKE YESTERDAY, LOW LEVEL LAPSE RATES ARE QUITE STEEP GIVEN THE
AMPLE SURFACE HEATING AND LOW LEVEL MOISTURE. THIS WILL PROVIDE
POTENTIAL FOR ANOTHER ROUND OF ISOLATED TO SCATTERED STORMS THIS
AFTERNOON, WITH LOWER CHANCES IN OUR NORTHERN/WESTERN AREAS WHERE
EVEN FAIR WEATHER CLOUDS ARE MORE SPARSE. DCAPE REMAINS HIGH
ACROSS THE AREA, SO WET MICROBURSTS RESULTING IN DAMAGING WIND
GUSTS WILL BE POSSIBLE IN SOME STORMS, WITH GREATER ODDS FURTHER
SOUTH WHERE DEEP LAYER MOISTURE IS GREATER. CONVECTION WILL
DIMINISH IN COVERAGE AFTER SUNSET.
TUESDAY AND WEDNESDAY: THE REMNANT SURFACE FRONT WILL CONTINUE TO
STALL AND WASH OUT OVER THE NEXT FEW DAYS, WITH A SOUTHEAST US
SURFACE RIDGE BECOMING A BIGGER PLAYER. THE POSITION OF THIS HIGH
FAVORS THE ADVECTION OF A SOMEWHAT DRIER AND...LESS HOT...AIR
MASS BEING WEDGED AROUND THE APPALACHIANS. WHAT WOULD THIS MEAN
FOR US? TEMPERATURES THAT ARE STILL ABOVE AVERAGE BUT NOT AS HIGH
AS WHAT WE HAVE BEEN SEEING AND INCREASINGLY MARGINAL HEAT
INDICES, WITH SITES LESS LIKELY TO REACH HEAT ADVISORY CRITERIA
EACH DAY. AS THIS MODIFIED AIRMASS BEGINS TO MOVE INTO THE
EASTERN PORTION OF THE AREA TOMORROW, WE HAVE CLIPPED THE HEAT
ADVISORY TO ONLY COVER OUR WESTERN HALF. AND IT'S POSSIBLE BY
WEDNESDAY AN ADVISORY WILL NOT BE NEEDED AT ALL. DIURNAL
CONVECTION IS STILL POSSIBLE EACH DAY WHERE DEEP LAYER MOISTURE
WILL BE GREATER, FAVORED OVER SOUTHERN/WESTERN AREAS TOMORROW
THEN ACROSS THE SOUTH ON WEDNESDAY.
THURSDAY THROUGH NEXT MONDAY: ANOTHER WEAK COLD FRONT WILL
APPROACH FROM THE NORTH AT THE END OF THE WEEK BUT STALL BEFORE
REACHING OUR AREA. INCREASING DEEP LAYER MOISTURE WILL POOL SOUTH
OF THIS FEATURE, RESULTING IN HIGHER RAIN CHANCES OVER THE BACK
HALF OF THE FORECAST PERIOD. THOUGH IT WILL STILL BE HOT, GREATER
PREVALENCE OF CLOUDS AND RAIN MAY CONTINUE TO TEMPER THE HEAT
ENOUGH TO AVOID CRITICAL HEAT STRESS THRESHOLDS BEING MET THIS
WEEKEND INTO EARLY NEXT WEEK. /DL/
AVIATION
(00Z TAFS)
ISSUED AT 631 PM CDT MON SEP 7 2026
ISOLATED TSRA WL CONTINUE ACROSS THE SOUTHERN HALF OF THE AREA BUT
ARE NOT EXPECTED TO AFFECT THE TAF SITES. VFR CONDITIONS WL
CONTINUE TO PREVAIL AREAWIDE THROUGH 21Z TUE. AFTER 21Z TUE
ISOLATED TSRA WL COME IN VCTY OF THE SOUTHERN TAF SITES. /22/
PRELIMINARY POINT TEMPS/POPS
JACKSON 75 95 73 95 / 20 20 0 10
MERIDIAN 74 94 73 95 / 20 10 0 10
VICKSBURG 75 96 73 94 / 10 30 10 10
HATTIESBURG 75 93 73 92 / 40 30 10 40
NATCHEZ 75 96 73 94 / 20 50 10 20
GREENVILLE 74 100 74 97 / 0 30 10 10
GREENWOOD 74 97 73 96 / 0 30 10 0
JAN WATCHES/WARNINGS/ADVISORIES
MS...HEAT ADVISORY UNTIL 7 PM CDT THIS EVENING FOR MSZ018-019-025>028-
034>036-040>043-047>066-072>074.
HEAT ADVISORY FROM 11 AM TO 7 PM CDT TUESDAY FOR MSZ018-019-
025>028-034>036-040>043-047-048-053-054-059>061.
LA...HEAT ADVISORY UNTIL 7 PM CDT THIS EVENING FOR LAZ007>009-015-016-
023>026.
HEAT ADVISORY FROM 11 AM TO 7 PM CDT TUESDAY FOR LAZ007>009-015-
016-023>026.
AR...HEAT ADVISORY UNTIL 7 PM CDT THIS EVENING FOR ARZ074-075.
HEAT ADVISORY FROM 11 AM TO 7 PM CDT TUESDAY FOR ARZ074-075.
DL/22
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