378
FXUS64 KJAN 270559 AAA
AFDJAN
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE JACKSON MS
1259 AM CDT MON JUL 27 2026
..NEW AVIATION
KEY MESSAGES
- DANGEROUS HEAT STRESS PERSISTS INTO MID-WEEK.
- "EXTREME HEAT WARNING" AND "HEAT ADVISORY" IN EFFECT THROUGH
TUESDAY.
DISCUSSION
ISSUED AT 115 PM CDT SUN JUL 26 2026
TONIGHT THROUGH SATURDAY...THE MAIN FOCUS DURING THIS FORECAST
PERIOD REMAINS THAT OF THE OPPRESSIVE HEAT THAT'LL BE OBSERVED OVER
THE AREA THROUGH AT LEAST THE MIDDLE OF THE WEEK. STRONG HIGH
PRESSURE ALOFT REMAINS WEDGED INTO THE REGION FROM THE WEST, WHILE
HIGH PRESSURE AT THE SURFACE REMAINS WEDGED IN FROM THE SOUTH. THE
COMBINATION OF BOTH WILL YIELD A PERIOD OF ABOVE NORMAL TEMPERATURES
(HIGHS FROM THE MID 90S TO JUST ABOVE THE CENTURY MARK), ALONG WITH
VERY HUMID CONDITIONS AS DEW POINTS SIT IN THE 70S. AFTERNOON HEAT
INDEX VALUES WILL CONSISTENTLY CLIMB TO & ABOVE 106F THROUGH MID-
WEEK, WITH SOME LOCATIONS ALONG & WEST OF THE INTERSTATE 55 CORRIDOR
SEEING INDICES CLIMB TO AND ABOVE 110F.
A "HEAT ADVISORY" REMAINS IN EFFECT ACROSS THE FORECAST AREA THIS
AFTERNOON AND MONDAY AS INDICES RANGE BETWEEN 106F-110F. THE
EXCEPTION TO THIS IS CURRENTLY ACROSS BOLIVAR, SUNFLOWER, & LEFLORE
COUNTIES WHERE AFTERNOON HEAT INDEX VALUES WILL CLIMB ABOVE 110F.
HERE, AN "EXTREME HEAT WARNING" IS IN EFFECT TODAY & MONDAY. IN
ADDITION ON THIS AFTERNOON'S PACKAGE, CONFIDENCE IN INDICES CLIMBING
ABOVE 110F HAS INCREASED ACROSS A LARGER PORTION OF THE CWA FOR
TUESDAY. THEREFORE, WE'VE EXPANDED THE "EXTREME HEAT WARNING" OVER
SOME CENTRAL AND WESTERN PORTIONS OF THE AREA TUESDAY, WITH A "HEAT
ADVISORY" IN EFFECT ELSEWHERE.
AT THE END OF THE FORECAST PERIOD, THURSDAY THROUGH SATURDAY, THE
AFOREMENTIONED HIGH ALOFT WILL WEAKEN ITS PRESENCE ACROSS REGION AS
IT RETREATS WESTWARD. THIS WILL ALLOW TROUGHING ALONG THE EAST
COAST TO DEEPEN ACROSS THE SOUTHEAST UNITED STATES. AS THIS
HAPPENS, ANOTHER SURFACE BOUNDARY WILL ATTEMPT TO SINK SOUTH INTO
THE CWA. THIS WILL INCREASE RAIN CHANCES ACROSS THE AREA,
POTENTIALLY BRINGING AT LEAST SOME TEMPORARY RELIEF TO THE HEAT. ONE
THING OF NOTE DURING THIS TIME, WHILE CHANCES FOR ISOLATED TO
SCATTERED CONVECTION WILL INCREASE, THE INCREASED NORTHWEST FLOW
ALOFT ACROSS THE REGION COULD YIELD AN MCS OR TWO AFFECTING THE
FORECAST AREA. THIS IS STILL MANY DAYS OUT AND WILL CONTINUE TO BE
MONITORED IN FUTURE MODEL DATA, AS WELL AS IN RADAR AND SATELLITE
DATA AS WE GET INTO THAT THURSDAY-SATURDAY TIMEFRAME. /19/
AVIATION
(06Z TAFS)
ISSUED AT 1250 AM CDT MON JUL 27 2026
THERE IS A LOW CHANCE THAT A -SHRA/-TSRA WL COME IN VCTY OF THE
EAST TAF SITES TODAY AND RESULT IN LOWER FLIGHT CONDITIONS BUT,
VFR CONDITIONS ARE EXPECTED TO PREVAIL THROUGH THE TAF PERIOD
OTHERWISE. /22/
PRELIMINARY POINT TEMPS/POPS
JACKSON 77 98 77 97 / 0 0 0 10
MERIDIAN 76 99 77 97 / 10 0 0 20
VICKSBURG 77 97 78 97 / 0 0 0 10
HATTIESBURG 77 99 78 99 / 10 0 0 10
NATCHEZ 76 97 76 98 / 0 10 0 10
GREENVILLE 77 99 78 96 / 0 0 0 20
GREENWOOD 76 99 77 96 / 0 0 0 20
JAN WATCHES/WARNINGS/ADVISORIES
MS...HEAT ADVISORY UNTIL 9 PM CDT THIS EVENING FOR MSZ026>066-072>074.
HEAT ADVISORY FROM 10 AM TO 9 PM CDT TUESDAY FOR MSZ028>033-
037>039-044>046-050>052-056>058-060>066-072>074.
EXTREME HEAT WARNING UNTIL 9 PM CDT THIS EVENING FOR MSZ018-019-
025.
EXTREME HEAT WARNING FROM 10 AM TO 9 PM CDT TUESDAY FOR MSZ018-
019-025>027-034>036-040>043-047>049-053>055-059.
LA...HEAT ADVISORY UNTIL 9 PM CDT THIS EVENING FOR LAZ007>009-015-016-
023>026.
HEAT ADVISORY FROM 10 AM TO 9 PM CDT TUESDAY FOR LAZ007>009-015-
016-023>026.
AR...HEAT ADVISORY UNTIL 9 PM CDT THIS EVENING FOR ARZ074-075.
HEAT ADVISORY FROM 10 AM TO 9 PM CDT TUESDAY FOR ARZ074-075.
19/22
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