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 314 AM 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 extended into Tuesday, and will likely be extended again into Wednesday with some expansion of the warning possible either day.

As we are on the eastern periphery of the upper ridge, there will be isolated to scattered mainly diurnal convection each day, providing at least temporary heat relief for some. 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 this morning. In spite of its relatively close proximity, the odds of hazardous impacts to our area remains 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 is very 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 fall apart. While we won't be able to turn off the ACs thanks to this feature, it will help to cut a few degrees off high temps through the back half of the week and bring dewpoints from the disgusting category to a more typical amount of misery 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/

AVIATION

(12Z TAFS) Issued at 611 AM CDT Mon Jul 20 2026

VFR conditions prevail with few clouds and light and variable winds. There is a low chance (20%) for a thunderstorm near one of the eastern or northern sites late this afternoon into the evening, so PROB30s were included. /SAS/

PRELIMINARY POINT TEMPS/POPS

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

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory from 10 AM this morning to 9 PM CDT Tuesday for MSZ026>033-036>066-072>074.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT Tuesday for MSZ018-019-025-034-035.

LA...Heat Advisory from 10 AM this morning to 9 PM CDT Tuesday for LAZ007>009-015-016-023>026.

AR...Heat Advisory from 10 AM this morning to 9 PM CDT Tuesday for ARZ074.

Extreme Heat Warning from 10 AM this morning to 9 PM CDT Tuesday for ARZ075.