Area Forecast Discussion
Issued by NWS Memphis, TN
Issued by NWS Memphis, TN
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845 FXUS64 KMEG 031115 AFDMEG Area Forecast Discussion National Weather Service Memphis TN 615 AM CDT Mon Jun 3 2024 ...New AVIATION... .SYNOPSIS... Issued at 424 AM CDT Mon Jun 3 2024 Thunderstorm chances will return to the Midsouth today, and persist through midweek. The first in a series of upper level disturbances will move into the Midsouth late this afternoon into early evening, bringing thunderstorms and a risk of damaging winds to eastern Arkansas, northwest Mississippi and southwest Tennessee. Before these storms enter the Midsouth, isolated thunderstorms will likely form this afternoon. Rain chances will peak on Wednesday, ahead of a weak cold front that will pass through on Thursday. This front will bring slightly cooler and less humid conditions for Friday and Saturday. && .DISCUSSION... (Today through Sunday) Issued at 424 AM CDT Mon Jun 3 2024 An unsettled pattern will persist through midweek, with weak zonal flow over moderate daytime instability. CAMs and medium range models depict shortwave troughs lifting from the Ozarks into the Midsouth this afternoon and again Tuesday morning. Both of these features will likely be aided by one or more MCVs, originating from convection over the southern plains. A Slight Risk for severe storms is in effect for the western third of the Midsouth today, with damaging winds the primary threat. The 06Z HRRR depicts recently formed storms over southwest KS moving ESE across OK and AR through late afternoon. Severe threat for the Midsouth will depend on arrival timing of these storm clusters, as surface-based CAPE will wane and CINH will increase after 6 PM. The HRRR hints at cold pool establishment over AR during the afternoon, which may speed arrival time and enhance the damaging wind threat. Prior to such an MCS arriving, CINH will erode with surface heating. HREF Grand Ensemble depicts surface- based CAPE in excess of 2000 J/kg this afternoon, accompanied by 20-25 KT of deep layer bulk sheer. HRRR hints at storms over OK early this morning contributing to an MCV that may aid storm organization over the Midsouth this afternoon, despite the otherwise weak shear. Weak zonal flow will continue on Tuesday, with embedded convectively- reinforced shortwaves. Model timing differences begin to emerge further out in time, but consensus appear to favor storms earlier in the day Tuesday. Storms coverage will impact CAPE, but HREF depicts surface-based CAPE nearing 1500 J/kg south of I-40 by noon Tuesday. Upper level flow over the Midsouth will begin transitioning to the northwest on Wednesday, behind an open trough lifting through the Ohio River Valley. An attendant weak surface pressure trof may provide a focus for storms over the Midsouth on Wednesday. A slightly stronger cold front will pass through Thursday, aided by stronger midlevel northwest flow. Slightly cooler temperatures will follow for Friday and Saturday, along with dewpoints cooling to the 60s. The deterministic ECMWF has come back in-line with the medium range model consensus in maintaining a ridge in the west / trough in the east pattern over the CONUS through the weekend. This would keep slightly below temperatures over the Midsouth. At this time, it`s unclear if the orientation of the upper flow will place us downstream of convection over the central and southern plains this weekend. NBM slight chance PoPs for the weekend appear in order at this time. PWB && .AVIATION... (12Z TAFS) Issued at 615 AM CDT Mon Jun 3 2024 Two MCS`s, one in southern KS and one in OK, will push towards the Mid-South this afternoon and evening. The MCS from KS looks to arrive first as it decays and bring showers and thunderstorms to the terminals this afternoon. VFR CIGs should prevail with a brief period of lower vsbys as the storms roll through. The MCS from OK will arrive this evening as it decays. Thunder chances will decrease as this MCV arrives as the environment is low shear and high CAPE. As the sunsets, we will start to stabilize. MVFR cigs look more likely tomorrow morning as the decaying vortices linger. IFR potential is there, but not confident enough to prevail so left SCT decks for now. DNM && .MEG WATCHES/WARNINGS/ADVISORIES... AR...None. MO...None. MS...None. TN...None. && $$ PUBLIC FORECAST...PWB AVIATION...DNM