textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress conditions are expected through at least the middle of this week. Daily max heat index values will be near 105 to 115 degrees.

- Chances for showers and thunderstorms begin to return mid to late week.

DISCUSSION

Issued at 134 PM CDT Sun Aug 16 2026

The very strong subtropical ridge will continue over the area for the next couple of days.. Have expanded the heat warning to the remainder of the eastern portions of the area, where heat indices will climb to 110 or above. The extreme heat will likely continue into Tuesday across most of the area./15/

An especially intense subtropical ridge axis will maintain it's position over our region for the next few days. A hot low level thermal ridge axis (e.g., H850 near 24 deg C) will support high temperatures approaching 104 deg F in the ArkLaMiss Delta region, and the 100 to 103 deg F range elsewhere. A few record high temperatures will likely be broken, and heat indices will be hot enough to meet extreme heat warning criteria, in spite of greater mixing. Have maintained the elevated to significant heat graphic and upgraded to an extreme heat warning for western portions of the area accordingly. Later this week and into next weekend, there are indications that strong westerlies will increase over the northeast CONUS. This will help to suppress and weaken the ridge, and allow for greater convective rainfall chances in our area. This could be a time to monitor for marginal severe weather threats. /EC/

AVIATION

(18Z TAFS) Issued at 109 PM CDT Sun Aug 16 2026

Isolated SHRA or even TSRA before 00Z east of Interstate 55, but confidence in thunder impacts are too low to mention at this time. Winds generally light and from a west or northwest direction to start the period. /NF/

PRELIMINARY POINT TEMPS/POPS

Jackson 100 78 99 77 / 0 0 10 10 Meridian 101 77 99 76 / 0 0 10 10 Vicksburg 99 77 98 77 / 0 0 0 0 Hattiesburg 102 77 99 77 / 20 10 20 10 Natchez 101 77 99 77 / 0 0 0 0 Greenville 101 80 101 77 / 0 0 10 10 Greenwood 100 78 99 76 / 0 0 10 10

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory from 9 PM this evening to 8 PM CDT Monday for MSZ026>033-037>039-044>046-050>052-056>058-065-066-074.

Extreme Heat Warning until 8 PM CDT Monday for MSZ018-019-025- 034>036-040>043-047>049-053>055-059>064-072-073.

LA...Heat Advisory from 9 PM this evening to 8 PM CDT Monday for LAZ007-015-023-024.

Extreme Heat Warning until 8 PM CDT Monday for LAZ008-009-016- 025-026.

AR...Heat Advisory from 9 PM this evening to 8 PM CDT Monday for ARZ074.

Extreme Heat Warning until 8 PM CDT Monday for ARZ075.