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 154 AM CDT Tue Jul 21 2026

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.

Confidence is high for dangerous heat stress conditions to continue across the area through Wednesday. 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. /NF/

AVIATION

(06Z TAFS) Issued at 1226 AM CDT Tue Jul 21 2026

VFR conditions will prevail with few to scattered mid to high clouds. Winds will generally be light and variable. There is a low (30%) chance for a thunderstorm at HEZ later this afternoon. /SAS/

PRELIMINARY POINT TEMPS/POPS

Jackson 97 77 97 76 / 20 10 20 0 Meridian 96 76 96 75 / 0 0 0 20 Vicksburg 97 79 97 76 / 20 10 10 0 Hattiesburg 96 77 97 77 / 0 0 30 20 Natchez 98 78 100 76 / 30 10 20 0 Greenville 99 79 95 74 / 20 10 0 0 Greenwood 99 77 97 74 / 20 10 0 0

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory until 10 AM CDT this morning for MSZ026-027-036- 040>043-047>049-053>055-059-060.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for MSZ026-027-036-040>043-047>049-053>055-059-060.

Extreme Heat Warning until 9 PM CDT this evening for MSZ018-019- 025-034-035.

Heat Advisory until 9 PM CDT this evening for MSZ028>033-037>039- 044>046-050>052-056>058-061>066-072>074.

LA...Heat Advisory until 10 AM CDT this morning for LAZ007>009-015- 016-023>026.

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

AR...Heat Advisory until 10 AM CDT this morning for ARZ074.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT this evening for ARZ074.

Extreme Heat Warning until 9 PM CDT this evening for ARZ075.