Area Forecast Discussion
Issued by NWS Memphis, TN
Issued by NWS Memphis, TN
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046 FXUS64 KMEG 251914 AFDMEG Area Forecast Discussion National Weather Service Memphis TN 214 PM CDT Tue Jun 25 2024 ...New SYNOPSIS, DISCUSSION... .SYNOPSIS... Issued at 204 PM CDT Tue Jun 25 2024 A cold front will push through the region on Wednesday with chances of showers and thunderstorms followed by mild temperatures and dry weather on Thursday. The heat will rebuild Friday into the weekend as upper ridging re-strengthen across the region. && .DISCUSSION... (This evening through next Monday) Issued at 204 PM CDT Tue Jun 25 2024 Very hot and humid air has pushed into the region on the backside of the surface high over the Southeast U.S. Temps well into the 90s combined with dewpoints in the mid to upper 70s across the Delta are creating heat index values around 110 degrees. Conditions are only slightly more reasonable toward the TN River where dewpoints are a little lower. Stifling conditions will continue into the early evening and Excessive Heat Warnings and Heat Advisories remain in effect. A few pop up showers or thunderstorms are possible through early evening though coverage will be sparse. Any evening convection will quickly dissipate with the loss of heating. A warm and humid night is on tap with lows in the 75 to 80 degree range. A cold front pushing south through the Mid-MS Valley combined with a decent mid level shortwave is expected to generate an MCS over MO overnight. The 12z CAMs timing is quite variable with some solutions showing convection reaching NE AR before 12z while the slower models are a little later. The MCS will push south across the area during the morning hours while probably going through a weakening phase. The latest hi-res model data points to perhaps the strongest push from the MCS occurring west of the Mid-South toward central AR where the 0-6km bulk shear is a little stronger. As the MCS pushes south into north MS expect redevelopment during the afternoon along any outflows or boundaries that push out from the morning convection. Expect a few severe storms either from the MCS or afternoon redevelopment with damaging winds being the main threat. PWs will be anomalously high with values reaching around 2 inches so very heavy downpours are possible. The MCS complicates the temp forecast. The MCS will probably move across much of the area by peak heating so that will limit the extent of the high heat. A few areas across north MS may reach a heat index of 105 degrees before convection moves through but given the uncertainty will let later shifts issue any heat headlines for Wednesday. Precip chances will taper off Wednesday night as upper level ridging builds in for Thursday. Thursday will be a mild day with light northerly flow behind the cold front. Southerly flow redevelops by the end of the week as surface high pressure moves off the SE Atlantic Coast. Meanwhile, broad upper level ridging will stretch across the region. This will result in a quick return to hot and humid conditions with heat headlines probably needed by the end of the week into the weekend. Pops start to increase by Sunday as a front tries to sag into the region. That is a long way out though so confidence is quite low attm. && .AVIATION... (18Z TAFS) Issued at 1220 PM CDT Tue Jun 25 2024 Latest CAM guidance shows the potential for isolated SHRA/TSRA development across the airspace later today/overnight(JBR), but confidence is not high enough to include in TAF at this time. Otherwise, SHRA/TSRA also looks possible early tomorrow morning, with greater confidence in a line of SHRA/TSRA moving through the Mid-South in the late morning to afternoon time frame. && .MEG WATCHES/WARNINGS/ADVISORIES... AR...Excessive Heat Warning until 8 PM CDT this evening for ARZ009- 018-026-027-035-036-048-049-058. Heat Advisory until 8 PM CDT this evening for ARZ028. MO...Heat Advisory until 8 PM CDT this evening for MOZ113-115. MS...Excessive Heat Warning until 8 PM CDT this evening for MSZ001- 007-008-010>012-020-021. Heat Advisory until 8 PM CDT this evening for MSZ002>006-009- 013>017-022>024. TN...Excessive Heat Warning until 8 PM CDT this evening for TNZ088. Heat Advisory until 8 PM CDT this evening for TNZ001>004-019>022- 048>055-089>092. && $$ PUBLIC FORECAST...SJM AVIATION...JPR