textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress will persist today.

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

DISCUSSION

Issued at 332 AM CDT Wed Jul 29 2026

Through Tonight: The oppressive heat and humidity will continue today but a weak backdoor cold front may help limit the heat in the north by late afternoon. Early morning satellite imagery/RAP analysis still showed the circulation around a large 594dam high centered over the southern Plains but also a closed low centered over the New England states. This closed low was helping support a weak cold front dropping into the Tennessee valley that will try and drop into the northern portions of our CWA later this afternoon. Our CWA will remain on the eastern periphery of the large high through the forecast period while maintaining northwest flow aloft across our CWA that will help the weak cold front drift south across our CWA tonight. It appears that the heat and humidity will again result in peak heat index values above 110F across our south and between the Mississippi river and Interstate 55 while our western and northeast zones see peak heat index values between 106F-110F before any relief from convection associated with the approaching cold front. An "Extreme Heat Warning" and "Heat Advisory" remains in effect today for the respective areas. The chance for rain this afternoon will be confined to our northern zones through early evening before rain chances spread south to the Highway 84 corridor tonight. /22/

Thursday Onwards...

The long-term forecast remains on track: 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. This system will also lose momentum and stall over the area which will bring higher than average diurnal rain chances across the area to finish out the period./OAJ/

AVIATION

(06Z TAFS) Issued at 1222 AM CDT Wed Jul 29 2026

VFR conditions and a light wind wl prevail through the TAF period with the exception of a few hours, 21-24Z across the northern TAF sites due to SHRA/TSRA. /22/

PRELIMINARY POINT TEMPS/POPS

Jackson 97 76 94 74 / 10 40 60 10 Meridian 97 75 94 73 / 20 40 60 10 Vicksburg 97 77 94 75 / 10 30 70 10 Hattiesburg 99 77 94 75 / 10 30 70 40 Natchez 98 76 94 75 / 10 30 70 20 Greenville 96 75 94 75 / 30 20 30 0 Greenwood 95 74 95 73 / 40 30 10 0

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.