


Area Forecast Discussion
Issued by NWS Jackson, MS
Issued by NWS Jackson, MS
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
436 FXUS64 KJAN 180159 AAB AFDJAN Area Forecast Discussion...UPDATED National Weather Service Jackson MS 859 PM CDT Fri Oct 17 2025 ...New MESOSCALE UPDATE... .KEY MESSAGES... - Slight risk for severe thunderstorms Saturday night into Sunday morning for parts of the area. - Post frontal boundary: fall-like temperatures and dry air. Rain chances return Monday evening into Tuesday. && .MESOSCALE UPDATE... Issued at 859 PM CDT Fri Oct 17 2025 A quiet and pleasant evening is underway. The only change planned for the near term forecast is the addition of patchy fog across much of south MS and central LA within the increasing isentropic ascent regime ahead of tomorrow`s storm system. HREF probabilities for 1/2 mi or less visibility are close to 50 percent over much of this area. For some of the area, it will be low ceilings rather than fog. No other changes are planned at this time. /DL/ && .DISCUSSION... Issued at 1251 PM CDT Fri Oct 17 2025 Through Saturday Night: We are continuing to monitor a Slight Risk for severe thunderstorms tomorrow evening into early Sunday morning. This is our first "cool season" type severe weather event of the season, so it`s important to refresh yourself on severe weather preparedness plans as you roll into the weekend. A lead shortwave disturbance will trigger thunderstorms over the Southern High Plains and Ozarks region during the afternoon Saturday, with a cold front and combined outflow boundary eventually sweeping east across the Gulf Coast region tomorrow night/Sunday morning. In advance of the approaching system, dew points in the upper 60s should advect northward into our forecast area during the afternoon and evening. Deepening moisture values may support scattered showers or a few thunderstorms initially. Then with greater forcing aloft with the shortwave and at the surface with the front/outflow, a more organized wave of thunderstorms should move across our forecast area mainly after sunset tomorrow night. High-res model guidance show MLCAPE values of up to around 1000-1500 J/kg ahead of the front, and around 35-40 kts of deep-layer wind shear. Low-level shear profiles may also be favorable enough for a marginal tornado risk with storms along the squall line. Therefore have made sure tornado wording has been included in the latest Hazardous Weather Outlook graphics. Main threat for wind and tornadoes will be in northeast Louisiana, southeast Arkansas, and northwestern Mississippi. A marginal risk for severe storms will spread south and east from that area overnight. Locally heavy rainfall is also expected, but dry ground and fast moving storms should limit any flash flooding potential. Sunday through Friday: The cooler air mass behind this front will feel refreshing. Temps should fall a few degrees below normal for mid October, with a few nights dropping into the 40s especially in the hillier cooler locations. Afternoon highs mostly in the 70s. A shortwave trough moving over the central CONUS around Tuesday looks to be moving in too quickly for any kind of moisture recovery, but a few sprinkles cannot be ruled out. The reinforcing cool front with that system will preserve the cooler temps into late week. /NF/ && .AVIATION... (00Z TAFS) Issued at 631 PM CDT Fri Oct 17 2025 VFR conditions prevail across the area this evening. Early Sat morning, low clouds and patchy fog will develop across portions of south MS and central/south LA, with categorical reductions possible around daybreak especially at HBG/PIB. VFR conditions should return by mid-morning as fog dissipates and lower clouds mix out. S/SE winds will be gusty at times Saturday afternoon, with some gusts in the 20-25 kt range. /DL/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 65 87 65 74 / 0 20 90 10 Meridian 64 89 65 77 / 0 10 80 20 Vicksburg 65 89 65 74 / 0 20 90 10 Hattiesburg 66 89 68 81 / 0 20 80 20 Natchez 64 89 65 76 / 0 30 80 10 Greenville 65 88 61 70 / 0 20 90 10 Greenwood 65 89 61 71 / 0 10 90 10 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. && $$ DL/NF