textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress continues this weekend and will worsen into the middle of next week.

DISCUSSION

Issued at 112 PM CDT Sat Jul 25 2026

Tonight through next Friday...Through much of this forecast period, strong high pressure aloft remains wedged into the region from the west, while high pressure at the surface remains wedged in from the south. While the stalled surface boundary to the north of the CWA will washout through the weekend, an isolated shower or storm will remain possible across the area each afternoon through mid-week in this moist and unstable airmass.

At the end of the forecast period, next Thursday into Friday, the aforementioned high aloft will weaken its presence across eastern portion of the region. This will allow troughing along the east coast to deepen across the Southeast United States. As this happens, another surface boundary will attempt to sink south into the CWA. Thus, increasing rain chances across the area and possibly bringing at least some temporary relief to the main weather focus of this forecast period...the oppressive heat.

Beginning Sunday and continuing through at least mid-week, high levels of both heat and humidity will yield a lengthy period of dangerous heat stress across the forecast area. While high temperatures Sunday will generally hover in the mid and upper 90s, they'll range more in the upper 90s on Monday, and upper 90s to just above 100 Tuesday into Wednesday. These temperatures, in addition to dew points in the 70s, will result in afternoon heat index values at and above 106 across the CWA, again beginning Sunday.

As a result, a "Heat Advisory" has now been hoisted across the forecast area on Sunday from 11 AM - 9 PM as indices range between 106-110 for at least a couple of hours. The exception to this is across Bolivar, Sunflower, & Leflore counties where afternoon heat index values will climb above 110 for an hour or two. Here, an "Extreme Heat Warning" has been issued for Sunday from 11 AM until 9 PM.

As this dangerous heat stress increases Monday through mid-week, a continuation of the "Heat Advisory" into the work week is expected, with further expansion of the "Extreme Heat Warning" across the CWA likely. This will be messaged in the latest HWO graphic. However at the moment, an assessment of the layout and continuation of heat- related products will be made on a daily basis. Therefore, please continue to monitor the latest forecast for the most up-to-date information. /19/

AVIATION

(18Z TAFS) Issued at 112 PM CDT Sat Jul 25 2026

VFR conditions are expected the next 24 hours, under few to scattered (FEW-SCT) cumulus deck between 7-9kft (mainly during peak diurnal heating during the mid morning to afternoon hours) and some increased mid to high clouds between 12-25kft. A few showers cannot be ruled out through late afternoon in the vicinity of GLH, GWO and GTR, with GTR the most likely this afternoon. Surface winds will remain generally westerly (sustained less than 10mph and highest gusts up to 15mph). Surface winds lighten overnight. /DC/

PRELIMINARY POINT TEMPS/POPS

Jackson 75 95 75 97 / 10 10 0 0 Meridian 75 94 76 98 / 10 20 0 10 Vicksburg 76 95 77 97 / 10 0 0 0 Hattiesburg 75 96 76 98 / 0 0 0 10 Natchez 75 96 75 98 / 0 0 0 0 Greenville 76 95 76 98 / 10 10 0 0 Greenwood 75 95 75 98 / 10 20 0 0

JAN WATCHES/WARNINGS/ADVISORIES

MS...Heat Advisory from 11 AM to 9 PM CDT Sunday for MSZ026>066- 072>074.

Extreme Heat Warning from 11 AM to 9 PM CDT Sunday for MSZ018- 019-025.

LA...Heat Advisory from 11 AM to 9 PM CDT Sunday for LAZ007>009-015- 016-023>026.

AR...Heat Advisory from 11 AM to 9 PM CDT Sunday for ARZ074-075.