textproduct: Jackson

KEY MESSAGES

- Hot and humid conditions resulting in dangerous heat stress will exist through the middle of this week.

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

DISCUSSION

Issued at 142 PM CDT Mon Jul 20 2026

Through Wednesday...

Mid and upper ridging centered over the southwestern CONUS and Rockies, paired with an increasingly moist low level airmass, will result in hot and humid conditions over the next few days, with high temps approaching the triple digits in some areas and heat indices over 105F and exceeding 110F at times. During the overnight, temperatures will be above average with lows in the upper 70s in most areas, and possibly around 80 in some spots Tuesday night/Wed morning. A Heat Advisory remains in effect areawide, except in the upper Delta where an Extreme Heat Warning is in effect. These were both expanded the Extreme Heat through central MS and NW LA through Tuesday evening.

As we are on the eastern periphery of the upper ridge, there will be isolated to scattered mainly diurnally driven convection each day, with chances hovering around 20% through mid week which will provide at least temporary heat relief for some sites that see precipitation.

A few storms with strong wind gusts cannot be ruled out, but there are no signs of organized severe potential worthy of an outlook at this time.

TD 2 is located over the northeastern Gulf today. In spite of its relatively close proximity, the odds of hazardous impacts to our area continue to remain very low. The upper ridge resulting in the heat impacts locally will expand through the week, steering the system westward. Additionally, it appears increasing shear may displace much of the convection to the south side of the system. Based on the current forecast track, showers could make it up to the Hwy 98 corridor during the middle of this week, with periodically breezy conditions and gusts in the 20-30 mph range. Again however, the threat for impactful conditions this far north remains quite low.

Thursday through the weekend...

A digging Atlantic trough will bring a weak surface front southward into the area, where it will stall and eventually wash out. This feature will help to cut a few degrees off high temps through the back half of the week and bring dewpoints down a couple of degrees, providing at least a little bit of relief; but don't expect temperatures to be unseasonable for July. With the front not expected to push all the way through, daytime heat stress levels will still remain elevated for areas south of I-20 through the end of the week. /DL/OAJ/

AVIATION

(18Z TAFS) Issued at 1145 AM CDT Mon Jul 20 2026

VFR conditions prevail with few clouds and light and variable winds. There is still a very low chance (<20%) for a showers/thunderstorms for our eastern/northeastern sites late this afternoon into the evening, however; with chances continuing to remain low, we have eschewed calling for it in the TAFs for this afternoon. /OAJ/

PRELIMINARY POINT TEMPS/POPS

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

JAN WATCHES/WARNINGS/ADVISORIES

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

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

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

Heat Advisory until 9 PM CDT Tuesday for MSZ028>033-037>039- 044>046-050>052-056>058-060>066-072>074.

LA...Heat Advisory until 10 AM CDT Tuesday for LAZ007>009-015-016-023- 025.

Extreme Heat Warning from 10 AM to 9 PM CDT Tuesday for LAZ007>009-015-016-023-025.

Heat Advisory until 9 PM CDT Tuesday for LAZ024-026.

AR...Heat Advisory until 10 AM CDT Tuesday for ARZ074.

Extreme Heat Warning from 10 AM to 9 PM CDT Tuesday for ARZ074.

Extreme Heat Warning until 9 PM CDT Tuesday for ARZ075.