textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress conditions will continue through the middle of this week.

- Tropical Bertha is forecast to stay south of our forecast area, with the probability of hazardous impacts in our area very low at this time.

DISCUSSION

Issued at 110 PM CDT Tue Jul 21 2026

The remainder of the day will remain relatively dry for a majority of the area, with isolated chances for showers mainly across southern and northeastern portions of the area. High resolution guidance continues to suggest the possibility of a few popup showers from as an embedded shortwave in the long wave troughing to our north allows for convection to drift into our area, while the influence of Tropical Storm Bertha, drifting northwest just off the Gulf Coast, is felt across our south. This is expected to remain sub-severe but a few strong storms aren't out of the question.

Dangerous heat stress conditions will continue across the area through Wednesday, with the focus shifting south of I-20 Wednesday. This will be reflected in the GHWO by an elevated risk of heat related stress conditions areawide with areas along and south of I-20 indicated as having a significant risk for heat related stress conditions. In addition, a mix of Excessive Heat Warnings and Heat Advisories will cover the 105+ heat index values through then. By Thursday, rain chances and the proximity of the frontal boundary in the region make hazardous heat less certain for Thursday or later at this time.

Tropical Storm Bertha, a sheared storm, will continue to move slowly west along the Gulf Coast over the next few days. No significant impacts are expected in our forecast area as it passes to the south, but winds will be a little breezy from the north Wednesday into Thursday.

A robust upper-level ridge centered over the Southern High Plains is reinforcing the dry, hot conditions over our region meanwhile. A cool front sagging into the region by Wednesday will serve as a focus for afternoon shower and thunderstorm development for the back half of the week and next weekend./NF/KP/

AVIATION

(00Z TAFS) Issued at 642 PM CDT Tue Jul 21 2026

There were a few Isold -SHRA on radar at 2330Z but these should dissipate before impacting any TAF site. VFR conditions wl prevail areawide until 12Z in the east and se when MVFR cigs wl be psbl through 16Z. After 16Z VFR conditions will resume areawide and a gusty ne-e wind 17-20kts wl develop and prevail through the afternoon. Isolated to scattered TSRA wl be psbl in the se after 19Z through the end of the TAF period. /22/

PRELIMINARY POINT TEMPS/POPS

Jackson 77 96 75 93 / 20 20 20 30 Meridian 76 95 75 92 / 0 10 20 50 Vicksburg 79 97 76 93 / 10 10 10 30 Hattiesburg 77 96 77 93 / 10 30 30 50 Natchez 78 99 76 94 / 10 20 20 30 Greenville 79 94 73 91 / 10 0 0 0 Greenwood 77 97 73 93 / 20 10 0 20

JAN WATCHES/WARNINGS/ADVISORIES

MS...Extreme Heat Warning until 9 PM CDT this evening for MSZ018-019- 025>027-034>036-040>043-047>049-053>055-059>065-072-073.

Heat Advisory from 10 AM to 8 PM CDT Wednesday for MSZ018-019- 025>039-044>046-050>052-056>058-066-074.

Extreme Heat Warning from 10 AM to 8 PM CDT Wednesday for MSZ040>043-047>049-053>055-059>065-072-073.

Heat Advisory until 9 PM CDT this evening for MSZ028>033-037>039- 044>046-050>052-056>058-066-074.

LA...Extreme Heat Warning until 9 PM CDT this evening for LAZ007>009- 015-016-023>026.

Heat Advisory from 10 AM to 8 PM CDT Wednesday for LAZ007-008- 015.

Extreme Heat Warning from 10 AM to 8 PM CDT Wednesday for LAZ009- 016-023>026.

AR...Extreme Heat Warning until 9 PM CDT this evening for ARZ074-075.

Heat Advisory from 10 AM to 8 PM CDT Wednesday for ARZ074-075.