213 FXUS64 KJAN 231841 AFDJANArea Forecast Discussion National Weather Service Jackson MS 141 PM CDT Tue Sep 23 2025
...New DISCUSSION, AVIATION...
.DISCUSSION... Issued at 138 PM CDT Tue Sep 23 2025
The upper-level weather pattern for much of this week will see the subtropical ridge suppressed to the south with broad and positively tilted trough over much of the central and eastern CONUS. Sometimes it is a challenge for the models to resolve exactly how the vorticity will consolidate as the trough pattern breaks down, but a shortwave rounding a Low over the Great Lakes and pivoting from the Rockies into the South today through Thursday will be the primary driver of weather in our area for the next 48 hours.
Gradual height falls with this system tonight into tomorrow will support increased convection ahead of an approaching cold front. Some forced storms can`t be ruled out along the front as it edges into our forecast area, but modest instability and about 25-35 kts of 0-6 km deep layer wind shear will result in potentially strong to severe thunderstorms in the warm sector ahead of the front. Without better forcing and better parameter space, the current Marginal Risk for severe thunderstorms appears adequate for the isolated severe storm potential with this system.
The main trough axis won`t pull east of our forecast area until Friday, so periods of clouds and a chance for rain may linger into Thursday and possibly Friday. The pattern uncertainty previously mentioned will become more noticeable over the weekend and into early next week. A portion of the trough is expected to close off over the Southeast U.S. as northern jet stream ridging moves into the central CONUS. Some guidance has even indicated a retrograding low pressure system in that time frame. For now, we expected the weekend into next week to stay dry. Will continue to monitor adjustments in the guidance. /NF/
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.AVIATION... (18Z TAFS) Issued at 138 PM CDT Tue Sep 23 2025
Isolated to scattered SHRA or TSRA through around 02Z Wednesday will primarily affect sites west of Interstate 55. Low stratus and patchy BR could bring MVFR ceilings or visibilities to a few TAF sites overnight, but threat for variable conditions near any showers or storms will remain through 18Z Wednesday.SHRA and TSRA chances will begin to increase again after 12Z Wednesday. /NF/
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.PRELIMINARY POINT TEMPS/POPS... Jackson 74 90 70 85 / 10 80 80 50 Meridian 71 92 70 84 / 10 60 70 70 Vicksburg 74 89 69 85 / 20 80 70 30 Hattiesburg 73 94 73 86 / 10 60 60 80 Natchez 73 88 70 84 / 20 80 80 40 Greenville 74 85 67 83 / 20 80 60 20 Greenwood 74 87 68 84 / 20 80 70 20
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.JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. &&
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NF
NWS JAN Office Area Forecast Discussion