textproduct: Jackson

KEY MESSAGES

- Dangerous heat stress continues today and will worsen through the middle of this week.

DISCUSSION

Issued at 404 AM CDT Sun Jul 26 2026

Through tonight: Heat and humidity will be the main concern in the near term. Early morning satellite imagery/RAP analysis showed the circulation around a large 598dam high centered over the central Plains. Our CWA will remain on the eastern periphery of this large high through the forecast period. A couple disturbances were noted dropping around the eastern side of the high. One such disturbance was over northeast Mississippi early this morning and local radars showed scattered light showers over our northeast zones. This activity will continue into this morning before ending as the disturbance shifts east of Mississippi. Early morning surface analysis had high centered over the northern Gulf. This surface high will remain in place through the forecast period. Together high pressure surface and aloft will contribute to temperatures topping out a couple degrees warmer than on Saturday. This heat will combine with high humidity to lead to heat index values above 105F over most of the CWA. Our northwest will see heat index values greater than 110F. There won't be much relief from the humidity tonight. A record warm low temperature was tied at Greenville Saturday with several climate sites coming within a couple degrees of setting or tying a record for warm morning lows. This trend will continue tonight as well. /22/

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. High temperatures will top out in the upper 90s on Monday, and upper 90s to just above 100F Tuesday into Wednesday. These temperatures, in addition to dew points in the 70s, will result in afternoon heat index values at and above 106F across the CWA.

As a result, the "Heat Advisory" for Sunday has been extended through 9 PM Monday with indices between 106-110F 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 extended until 9 PM Monday.

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.

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./19/22/

AVIATION

(12Z TAFS) Issued at 633 AM CDT Sun Jul 26 2026

VFR conditions wl prevail through the TAF period. /22/

PRELIMINARY POINT TEMPS/POPS

Jackson 95 76 97 76 / 10 0 0 0 Meridian 95 76 99 76 / 20 0 0 0 Vicksburg 95 77 97 77 / 0 0 0 0 Hattiesburg 96 77 99 77 / 0 10 10 0 Natchez 96 76 97 75 / 0 0 0 0 Greenville 97 77 98 77 / 0 0 0 0 Greenwood 97 75 99 76 / 10 0 10 0

JAN WATCHES/WARNINGS/ADVISORIES

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

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

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

AR...Heat Advisory from 11 AM this morning to 9 PM CDT Monday for ARZ074-075.