One of several thunderstorms in northeast Alabama produced wind damage at a marina and adjacent campground in Claysville.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS HUN wrote it up.
One of several thunderstorms in northeast Alabama produced wind damage at a marina and adjacent campground in Claysville.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Huntsville, AL wrote its last area forecast discussion before the first event at Aug 7, 2:09 PM CST, 1 hour 36 minutes earlier.
Area Forecast Discussion National Weather Service Huntsville AL 309 PM CDT Fri Aug 7 2020 .NEAR TERM...(Tonight) Issued at 309 PM CDT Fri Aug 7 2020 Isolated showers and thunderstorms have developed along a line extending northeastward from Cullman to Dekalb counties, coincident with a the stationary front that has meandered northward just to the southern fringes of the CWA. Weak shear and available instability will limit the organization of any developing storms, but the strongest will be capable of gusty winds and locally heavy rainfall. Afternoon temperatures have reached the upper 80s to low 90s across the TN Valley. Any lingering showers are expected to taper off around sunset after loss of peak heating. Overnight, skies will remain mostly clear, allowing for the development of patchy fog in river valleys. Low temperatures will drop to the mid-to-upper 60s. .SHORT TERM...(Saturday through Sunday) Issued at 309 PM CDT Fri Aug 7 2020 As the mid-level ridge continues to build in from the west on Saturday, subsidence will increase, leading to decreased chances of shower development and increasing temperatures. A weak pocket of vorticity will clip the northern edge of AL, lingering through 21Z, which when combined with mixing and warming in the afternoon, may lead to transient storm development, but PoPs remain low at 10-14%. High temperatures will likely be a few degrees above what was recorded the past few days for a majority of the area, topping out in the low-to-mid 90s. The mid-level ridge weakens in the period from Saturday night to Sunday, resulting in weakening subsidence and the return of larger chances for convective development. There is low confidence in the potential for influence of local vorticity maxima traversing the ridge to increase coverage of showers. Highs will remain in the low-to-mid 90s, with slightly lower temperatures possible in any regions of shower development, with lows again in the upper 60s to low 70s. .LONG TERM...(Monday through Thursday) Issued at 309 PM CDT Fri Aug 7 2020 The extended forecast period continues to evolve into an interesting and perhaps active pattern, with surprisingly good model and ensemble agreement. Broad, weak ridging will be the rule Monday, with heat and humidity continuing. Blended guidance and low-level temperatures support highs at least in the mid 90s, and depending on storm coverage, this may be on the low side. The devil is in the details here, as various model & ensemble members break down the ridging at different times, and thus have higher PoPs/lower temps or vice-versa. For now, the forecast will stick close to the blend with middle-of-the-road chance PoPs. The pattern will shift to a more NW flow regime Tuesday as the mid- level ridge retrogrades further into the Desert SW. So heat will persist, but the subsidence will not, leading to a generally wetter pattern with high PWat values and greater instability. Heat index readings are forecast to top out between 100 and 105 Monday and Tuesday, and this may trend warmer still if the storms do not materialize as forecast. It is interesting see many global models and ensemble members produce a tight, compact shortwave, likely an MCV, that passes somewhere between Indiana and Alabama early Wednesday. Otherwise, the region will remain sandwiched between two mid-level ridges Wednesday and Thursday, with greater signs of a bonafide trough developing by Friday. As a result, the heat will subside somewhat, but moisture content and PoPs will remain high. Blended guidance appears reasonable throughout the extended, particularly after Tuesday as the ridge breaks down. && .AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon) Issued at 116 PM CDT Fri Aug 7 2020 VFR conditions are expected thru 18Z/08. Patchy MVFR fog may develop in the 09-12Z timeframe, particularly at KHSV, but confidence is not high enough to include in the TAFs at this time. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...NONE. TN...NONE. && NEAR TERM...LH SHORT TERM...LH LONG TERM...BCC AVIATION...BCC For more information please visit our website at weather.gov/huntsville.
Hazardous Weather Outlook National Weather Service Huntsville AL 226 PM CDT Fri Aug 7 2020 ALZ001>010-016-TNZ076-096-097-081100- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN- 226 PM CDT Fri Aug 7 2020 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...Tonight... The probability for widespread hazardous weather is low. A few thunderstorms are possible across northeastern Alabama into the Cullman County area in the afternoon. .DAYS TWO THROUGH SEVEN...Saturday through Thursday... Low chances for mainly afternoon storms will return to the Tennessee Valley Sunday and Monday. A few strong storms could produce gusty winds and locally heavy rainfall. More numerous thunderstorms are expected Tuesday through Thursday. Some of these storms could produce very heavy downpours and strong gusty winds. .SPOTTER CALL TO ACTION STATEMENT... Activation of storm spotters and emergency management personnel is not anticipated at this time. 27
The Northeast Alabama radar (KHTX), 62 km away, was scanning. The volume nearest the first event began at 21:46 UTC.
2 thunderstorm wind. Local standard time, as filed.
Broadcast media relayed a social media report of thunderstorm wind damage at a campground and marina near Claysville. A tree was snapped and a couple of tents were overturned and damaged.
Broadcast media relayed a social media report of thunderstorm winds at the Guntersville sailing marina pushing boats into each other and knocking over one of the docks. Exact damages unknown. Time estimated by radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alabama in 2020Every state in 2020This day in weather historyWarnings in Alabama, August 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 918015, 918016.