093 FXUS64 KJAN 210855 AFDJANArea Forecast Discussion National Weather Service Jackson MS 355 AM CDT Sun Sep 21 2025
...New DISCUSSION...
.DISCUSSION... Issued at 340 AM CDT Sun Sep 21 2025
The primary weather concern for this week will be the threat for marginally severe storms impacting northwest portions of the forecast area Wednesday. Otherwise, significant weather impacts are generally not expected.
In the near term, low level ridging over the southeast CONUS will continue to keep things hotter than normal as we finish up the weekend and go into early next week. Given hot and unstable conditions and a subtle upper level shortwave trough crossing the region, scattered showers and a few storms will develop again later this afternoon, and a stray storm or two may briefly become strong to severe.
The forecast gets more interesting during the middle of the week. Global models continue to indicate that a shortwave trough will amplify and dig southward in the Mississippi Valley region. As this happens and deep layer flow increases, a developing surface wave and strengthening warm sector will lower pressures over the forecast area Wednesday. This could result in a threat for strong to marginally severe multicell clusters and perhaps a few supercells if the cold frontal timing and storm initiation coincide with peak heating. SPC has included northwest portions of the forecast area in a marginal severe risk for Tue-Tue night, and can imagine this threat will be extended into Wednesday and expanded southeast with future outlooks assuming there are no significant changes in the guidance. We will be including a similar area in our hazard graphics for local messaging.
Going into late week, the trough should slowly shift east, which could prolong the potential for beneficial rainfall over eastern portions of the area as cyclonic flow lingers. By the weekend, conditions look dry milder on the backside of the trough with temperatures near typical values for late September. /EC/
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.AVIATION... (06Z TAFS) Issued at 1220 AM CDT Sun Sep 21 2025
Aside from a few high clouds and light southerly winds, quiet conditions will prevail across all TAF sites with VFR conditions prevailing. /CR/
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.PRELIMINARY POINT TEMPS/POPS... Jackson 93 68 92 70 / 30 20 10 0 Meridian 93 67 91 67 / 30 30 10 0 Vicksburg 94 69 92 70 / 20 10 10 0 Hattiesburg 95 68 93 68 / 20 10 10 0 Natchez 93 68 92 69 / 20 10 10 0 Greenville 93 68 92 70 / 20 20 10 10 Greenwood 94 69 92 70 / 30 20 10 10
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.JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None.
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EC/CR
NWS JAN Office Area Forecast Discussion