textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress will persist into Wednesday.

- Increasing rain chances will begin to limit heat stress potential later in the week, especially across North Mississippi and Arkansas.

DISCUSSION

Issued at 348 AM CDT Tue Jul 28 2026

Through Tonight: Excessive heat and humidity looks to peak today over the whole CWA. Early morning satellite imagery/RAP analysis showed the circulation around a large 596dam high centered over the southern Plains. Our CWA will remain on the eastern periphery of this large high through the forecast period. Early morning surface analysis had high centered over the northern Gulf. This surface high will remain in place through the forecast period. Together high pressure surface and aloft will contribute to more of the CWA topping out in the upper 90s to near 100F this afternoon. The combination of hot temperatures and high humidity will result in peak heat index values above 110F across our south and between the Mississippi river and Interstate 55. Our western and northeast zones will see peak heat index values between 106F-110F. An "Extreme Heat Warning" and "Heat Advisory" remains in effect today for the respect areas. The chance for rain today will be too low to bring any relief from the heat. /22/

Wednesday Onwards...

Portions of south/west MS and northeast LA will still face heat concerns through Wednesday afternoon before clouds/precipitation begin to mitigate heat later this week. As such heat advisories/warnings may need to be extended through Thurs/Fri. A front is expected to sag into the area and stall out through the area for the rest of the week. This front should allow for slightly drier and cooler conditions for the northern portions of the CWA during the latter half of the week. Increased chances for convective activity and cloud coverage will also take hold due to the surface confluence from the aforementioned front which could provide a few degree dip; mitigating heat threat concerns. With upper flow becoming more northerly and northwesterly during this time frame, we will see potential for one or two convective complexes moving into the area or developing over the area.

By the end of the work week, an upper shortwave looks to become organized enough that a more typical front will develop across the Central Plains and push into the area around the late Friday/Saturday time frame. This will result in continued higher rain chances across the area heading into the weekend. It is uncertain how much progress this front will make through the area before stalling, but where it does end up will bring higher than average rain chances across that area to finish out the period./OAJ/

AVIATION

(06Z TAFS) Issued at 1229 AM CDT Tue Jul 28 2026

VFR conditions wl prevail through the TAF period. /22/

PRELIMINARY POINT TEMPS/POPS

Jackson 98 77 97 75 / 0 0 10 30 Meridian 100 78 97 74 / 0 0 40 20 Vicksburg 98 78 97 77 / 0 0 10 20 Hattiesburg 99 78 99 77 / 0 10 10 50 Natchez 98 76 98 77 / 0 0 10 20 Greenville 100 78 96 75 / 0 0 30 20 Greenwood 100 77 96 73 / 0 0 40 10

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory from 10 AM this morning to 9 PM CDT this evening for MSZ028>033-037>039-044>046-050>052-056>058-060>066- 072>074.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for MSZ018-019-025>027-034>036-040>043-047>049- 053>055-059.

LA...Heat Advisory from 10 AM this morning to 9 PM CDT this evening for LAZ007>009-015-016-023>026.

AR...Heat Advisory from 10 AM this morning to 9 PM CDT this evening for ARZ074-075.