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Area Forecast Discussion
Issued by NWS Jackson, MS
Issued by NWS Jackson, MS
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260 FXUS64 KJAN 132012 AFDJAN Area Forecast Discussion National Weather Service Jackson MS 312 PM CDT Sat Jul 13 2024 ...New DISCUSSION... .DISCUSSION... Issued at 311 PM CDT Sat Jul 13 2024 Today through Next Saturday: Looking at how today`s weather has trended, two features are worth noting. First is the areas of convection over Southeast Texas and southwestern Louisiana this afternoon. This activity is within a plume of 2.0 inch PWAT air and beneath the right entrance region of the jet stream associated with an upper-level trough in the region. Increased lift and saturation in that area is generating a fair amount of convection and spreading the cirrus blowoff clouds over Northeast Louisiana. This has helped to shade the western half of our area so far this afternoon and limit max temps by a few degrees. Meanwhile, eastern Mississippi zones are sufficiently warming into the mid and upper 90s as advertised. The other feature of note is the sprawling surface high over the Southeast U.S. and the drier air it is helping to mix down over northern portions of our area this afternoon. Dew points even south of Interstate 20 have mixed out into the lower 70s today. The resulting drier conditions have limited expected heat index values today, with only the Pine Belt retaining the peak heat and humidity for strict Heat Advisory criteria. Areas through the I-20 corridor in Mississippi are still near 105, so will keep current advisory in effect, but portions of Northeast Louisiana and northwest Mississippi were removed from today`s advisory. The NAM and GFS explicitly show some sort of mid- level low or MCV feature evolving from the TX/LA convection this evening and drifting northeast with the flow, and this seems like a reasonable possibility given the jet dynamics and vorticity in the base of the upper-level trough. Such a feature will continue at least slight chance POPs into the evening, increase cloud cover for tomorrow, and bring possible earlier start to rain chances tomorrow. Either way, guidance pegs higher cloud cover and resulting lower temps in the western zones again tomorrow. Have left the Heat Advisory unchanged for tomorrow at this time, but current projections have peak heat index values only near or exceeding 105 degrees in Southeast Mississippi. Will let the next forecast shift evaluate trends into the evening. The upper-level trough axis never truly clears out of the central Gulf Coast region through the end of this week, so afternoon convection and increased cloud cover will continue to challenge peak heating potential. If convection should hold off any afternoon, there is the potential for dangerous heat to be a concern . Will continue to advertise the Elevated risk out through the middle of this week. A shortwave rounding the base of the trough will usher a cold front into the region around Thursday time frame, which should limit any further heat potential and also will focus rain chances again in our area. /NF/ && .AVIATION... (18Z TAFS) Issued at 1251 PM CDT Sat Jul 13 2024 VFR ceilings will prevail across central MS to start off the TAF period. Weather conditions will remain quiet through 18Z with mid to high clouds expected. Scattered SHRA and TSRA will be possible mainly across south MS and central LA starting around 20Z Saturday, which will result in brief sub-VFR conditions across southern TAF sites (mainly HBG, PIB and HEZ). Elsewhere, some isolated SHRA could occur across north and central MS around this timeframe. Showers will begin to diminish around 02Z Sunday with VFR ceilings expected through 11Z Sunday. Some light patchy fog will be possible across south MS starting around 06Z Sunday and will last through 12Z Sunday. Scattered SHRA and TSRA will make a return across south MS starting around 15Z Sunday before becoming widespread Sunday afternoon. /CR/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 76 95 75 95 / 10 50 30 60 Meridian 74 98 74 96 / 10 50 30 60 Vicksburg 75 94 75 95 / 20 40 20 40 Hattiesburg 76 97 76 95 / 40 70 20 70 Natchez 74 93 75 93 / 20 50 10 40 Greenville 76 94 75 95 / 10 30 10 20 Greenwood 76 96 75 95 / 10 30 10 30 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...Heat Advisory from 10 AM to 7 PM CDT Sunday for MSZ040-041- 047>049-053>057-059>066-072>074. Heat Advisory until 7 PM CDT this evening for MSZ047>049-053>057- 059>066-072>074. LA...Heat Advisory from 10 AM to 7 PM CDT Sunday for LAZ007>009-015- 016-023>026. Heat Advisory until 7 PM CDT this evening for LAZ016-025-026. AR...None. && $$ NF/CR