Area Forecast Discussion
Issued by NWS Huntsville, AL
Issued by NWS Huntsville, AL
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509 FXUS64 KHUN 021842 AFDHUN Area Forecast Discussion National Weather Service Huntsville AL 142 PM CDT Sun Jun 2 2024 ...New NEAR TERM, SHORT TERM... .NEAR TERM... (Tonight) Issued at 142 PM CDT Sun Jun 2 2024 A few clusters of showers and storms have developed along a weak convergence boundary along and just south of the Tennessee River this afternoon. The main threats with this activity will mainly be lightning, locally heavy downpours, and perhaps some brief gusty winds through late this afternoon/early this evening. With the setting sun, this activity will wane and the end result will be tranquil weather across the Tennessee Valley overnight as cloud cover breaks up. However, due to the mostly clear/calm conditions and moist boundary later, a favorable setup for patchy fog will be in place late tonight into early Monday morning. It`s possible a few spots may become locally dense and that`s something we`ll have to watch for later this evening and overnight. && .SHORT TERM... (Monday through Tuesday night) Issued at 142 PM CDT Sun Jun 2 2024 Early morning fog will quickly dissipate and the end result will be a mostly sunny and rain-free June day on Monday as a subtle ridge axis noses into the area. It will still feel quite humid, however, and with highs in the mid to upper 80s and peak heat indices in the lower 90s. The tranquil weather will be short-lived as another shortwave will ripple from the Mid South into the Tennessee Valley and Southern Appalachians on Tuesday, with medium chances for showers and storms (40-60%) returning by the afternoon hours. It`s possible a couple strong storms may develop during the peak heating afternoon/early evening window with gusty winds and heavy downpours being the main threats. This initial activity will wane overnight, but cloud cover will begin to creep back ahead of the next feature set to bring some additional chances for convection on Wednesday. More on this in the section below. && .LONG TERM... (Wednesday through Saturday) Issued at 259 AM CDT Sun Jun 2 2024 Heading into mid week, a deepening upper level low riding along the U.S. and Canadian border just NW of the Great Lakes will run into a blocking pattern. The associated sfc low will have a cold front that extends down the MS Valley. A shortwave will swing through before the cold front does, providing medium chances (40-60%) Wednesday morning, and coverage increases to high chances (60-70%) in the afternoon ahead of the front. Showers and storms will linger into Thursday, lesser in coverage though, until the front itself passes through. Forecast soundings show pockets of instability but weak shear with PWAT forecasts up to 1.8-1.9" (75th percentile or higher). At this time, hazards are heavy rainfall and gusty winds. Will note that WPC has the TN Valley in a Marginal ERO again on Wednesday, so will watch for flooding potential. Behind the front, cooler and drier air will filter in, decreasing cloud cover and dewpoints. Temps will only be a tad cooler, with highs in the low/mid 80s and lows in the lower 60s at night both Friday and Saturday. && .AVIATION... (18Z TAFS) Issued at 1201 PM CDT Sun Jun 2 2024 Have added a TEMPO between 18-22z at both terminals for MVFR/IFR conditions from a TSRA that may impact either site through the late afternoon. By the early evening, convection will wane and a return to VFR conditions will prevail. The one exception may be late tonight into early Monday morning when some patchy fog may cause reductions at both sites briefly. Did not have enough confidence to mention at this time, but future forecasts may need to add a mention in should confidence increase. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...None. TN...None. && $$ NEAR TERM...AMP SHORT TERM....25 LONG TERM....JMS AVIATION...AMP