textproduct: Jackson
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Dangerous levels of heat stress will continue today, mainly over the western half of the area.
- Hot temperatures will continue for the remainder of the week and weekend, but lower humidity should help to reduce heat stress.
DISCUSSION
Issued at 300 AM CDT Wed Sep 16 2026
Today through Tuesday: An unusually strong subtropical high (H500 600 dam, SD 3+) for late September will be the primary influence on our region's weather through the entire forecast period. The only exception to the ridge dominance will be brief interaction with an upper trough that is expected to meander westward across the Florida peninsula this weekend. Given the strength of the ridge, daytime temperatures will continue to be well above normal, and a few record highs could be broken, especially over the northwest half of the forecast area. Fortunately, in terms of heat stress, increased low level dry easterly flow and strong daytime mixing will result in lower relative humidity and reduced heat indices.
There is some disagreement among the global ensembles with how far west the upper low center and it's sphere of influence will reach, but the consensus as of now is for a small increase in diurnally driven afternoon showers and storms this weekend. A trend to monitor will be late Saturday thunderstorm chances over southeast portions of the forecast area in association with increased deep layer moisture on periphery of the upper low. As of now, we are indicating very limited rain chances in the official forecast. Low to medium diurnally shower and storm chances can be expected net week. /EC/
AVIATION
(12Z TAFS) Issued at 609 AM CDT Wed Sep 16 2026
All TAF sites are VFR this morning and this will continue through the period. Calm winds will become light southeasterly later this morning./15/
PRELIMINARY POINT TEMPS/POPS
Jackson 96 73 95 68 / 0 0 0 0 Meridian 96 70 95 68 / 0 0 0 0 Vicksburg 96 73 95 68 / 0 0 0 0 Hattiesburg 95 70 93 66 / 0 0 0 0 Natchez 97 73 95 67 / 0 0 0 0 Greenville 99 74 99 71 / 0 0 0 0 Greenwood 98 73 98 70 / 0 0 0 0
JAN WATCHES/WARNINGS/ADVISORIES
MS...Heat Advisory from 11 AM this morning to 7 PM CDT this evening for MSZ018-019-025>037-040>043-047>049-053>055-059>064-072.
LA...Heat Advisory from 11 AM this morning to 7 PM CDT this evening for LAZ007>009-015-016-023>026.
AR...Heat Advisory from 11 AM this morning to 7 PM CDT this evening for ARZ074-075.
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