textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress will persist across portions of the forecast area into next week.

- Showers and thunderstorms over the next few days will be capable of locally heavy downpours and strong gusty winds.

DISCUSSION

Issued at 110 PM CDT Fri Sep 4 2026

This afternoon through next Friday...

Current radar scans show scattered showers and storms tracking west across Hwy 84. This is due to an easterly wave bringing a renewed surge of moisture mainly across portions of southeast MS. Rain chances will increase later this afternoon with the best chances for scattered showers and storms mainly along and south of I-20. A few strong to marginally severe storms cannot be ruled out. Hot and humid conditions will persist across much of the area today with afternoon highs peaking in the mid to upper 90s and heat index reading values peaking around 105-110 degrees. A few spots across portions of central MS could see heat index values briefly exceed 110 degrees this afternoon. No changes have been made to the heat graphic for today and an "Elevated" risk for dangerous heat will continue to be advertised for much of the area. Likewise, the heat advisory remains in effect for parts of the area, including portions of southeast AR and all of northeast LA, until 7 pm this evening.

Rain chances will begin to decrease across much of the area later this evening, with a few lingering showers and storms possible mainly along and south of Hwy 84. Quiet conditions will prevail across our entire forecast area by midnight with overnight lows dipping into the low 70s. As we head into early Saturday morning, clouds will begin to increase in coverage from the south to the north. Although HREF fog guidance is beginning to show low probabilities (around 10-20%) of patchy fog across our entire forecast area, there is not enough support from the REFS to suggest widespread fog potential. Fog graphics will not be introduced at this time given the low probability of fog development highlighted by HREF dense fog guidance, however shallow patchy fog will be possible particularly after dawn.

Upper level ridging will continue to dominate the regional weather, though will shift from the Mid-South to the High Plains and then back again over the next several days. Limited to elevated heat stress will continue to be the primary focus for the long term as heat index values are forecasted to peak in the 105-110 degree range across much of the area through the Labor Day Weekend. Late afternoon/early evening showers and storms should help keep parts of our CWA under Heat Advisory criteria. With the deep tropical moisture in place, some of these storms will have the capability to produce locally heavy downpours at times. Regardless, an Heat Advisory has been issued for much of our CWA for Saturday. As we go beyond Saturday, additional heat advisories will eventually be needed for Sunday and Monday. There is a possibility that an Extreme Heat Warning could be introduced for portions of our forecast area on Sunday. Heat trends will continue to be monitored as we go through the weekend.

Dangerous heat will continue to persist across the area as we head into the new work week. Additional heat headlines/advisories will eventually be needed as we get closer. Heat trends will begin to decrease across parts of the area by the mid week as global guidance shows a frontal boundary pushing south across the area. Rain chances will be possible mainly for areas along and south of I-20 heading into Thursday with higher chances across much of the area on Friday. /CR/

AVIATION

(00Z TAFS) Issued at 643 PM CDT Fri Sep 4 2026

VFR conditions will prevail until after 10Z when low stratus and lower visibility could lower flight categories to MVFR/IFR. Improvements to MVFR/VFR begin after 05/14-16Z. Isolated showers and thunderstorms will redevelop after 18z with the better chances for rain at southern sites. Winds tonight become light and variable for becoming light and easterly after 13Z. /86/

PRELIMINARY POINT TEMPS/POPS

Jackson 73 95 73 97 / 10 20 0 20 Meridian 73 96 73 100 / 10 30 10 30 Vicksburg 73 94 73 97 / 20 20 10 20 Hattiesburg 73 93 73 96 / 30 40 10 50 Natchez 72 93 73 96 / 30 30 0 30 Greenville 75 99 75 101 / 0 10 10 10 Greenwood 73 99 74 100 / 0 10 10 10

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory until 7 PM CDT this evening for MSZ018-019-025>054- 059>062.

Heat Advisory from 11 AM to 7 PM CDT Saturday for MSZ018-019- 025>054-059>062.

LA...Heat Advisory until 7 PM CDT this evening for LAZ007>009-015-016- 023>026.

Heat Advisory from 11 AM to 7 PM CDT Saturday for LAZ007>009-015- 016-023>026.

AR...Heat Advisory until 7 PM CDT this evening for ARZ074-075.

Heat Advisory from 11 AM to 7 PM CDT Saturday for ARZ074-075.