Tropical moisture left over from Tropical Storm Gordon and daytime heating lead to the development of afternoon thunderstorms with very heavy rain. The heavy rain caused flooding in southwest Alabama.
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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 MOB wrote it up.
Tropical moisture left over from Tropical Storm Gordon and daytime heating lead to the development of afternoon thunderstorms with very heavy rain. The heavy rain caused flooding in southwest Alabama.
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 Mobile, AL wrote its last area forecast discussion before the first event at Sep 6, 5:24 PM CST, 1 minute earlier.
Area Forecast Discussion...UPDATED National Weather Service Mobile AL 624 PM CDT Thu Sep 6 2018 .DISCUSSION...Updated for latest aviation discussion below. && .AVIATION... 00Z issuance...VFR conditions expected most of the period for TAF sites. Current showers and thunderstorms stretching north between area TAF sites are rapidly decreasing in coverage and strength, so am not anticipating significant impacts to TAF sites this evening. Isolated to scattered coverage of showers and thunderstorms Friday afternoon may bring TEMPO drops in CIGS and VISBYS to MVFR levels, but again, am not anticipating significant impact to operations. /16 && .PREV DISCUSSION... /issued 331 PM CDT Thu Sep 6 2018/ NEAR TERM /Now Through Friday/...Surface high pressure will continue to ridge into the area from the east through Friday, resulting in a continued light east to southeast flow through the period. This flow will maintain a very moist airmass, which when combined with daytime heating will result in the development of scattered showers and thunderstorms again during the day on Friday. Temperatures will remain near normal for this time of year. /13 SHORT TERM /Friday night Through Sunday night/...A weak upper trough drifts slowly west over the Florida peninsula and into the eastern Gulf as we head into the weekend. At the surface, high pressure ridging from the western Atlantic into the eastern Gulf maintains a generally light onshore flow across the region. Thus, expecting us to return to a typical diurnal summertime pattern Saturday and Sunday, with PoPs around seasonal (30-40 percent) as scattered thunderstorms develop each afternoon. High temperatures range from the upper 80s to low 90s, and low temps remain in the low to mid 70s. /49 LONG TERM /Monday Through Thursday/...As we head into next week, a deepening upper longwave trough digs over the southern Plains and into the Mississippi River Valley to our west. As this trough approaches, a more diffluent upper-level flow pattern overspreads the local area and large-scale ascent becomes more abundant. Coupled with a moist and diurnally unstable airmass, expecting a more numerous thunderstorm coverage through the early part of next week. Maintained 50-60 PoPs, and lowered temperatures a few degrees (mid to upper 80s) each afternoon to account for the greater coverage in clouds and rain. There is some indication among medium and long range guidance that a cutoff low pinches from the upper trough and meanders over the lower Mississippi River Valley for a while. This could support a continued wetter- than-seasonal pattern through the middle and late part of next week as well. /49 MARINE...High pressure from the western Atlantic into the Gulf will continue through the weekend. This will lead to a light to occasionally moderate east to southeast wind flow through Saturday. Wind flow will become more southerly and increase early next week as a system approaches from the northwest. /13 && .MOB WATCHES/WARNINGS/ADVISORIES... AL...None. FL...None. MS...None. GM...None. && This product is also available on the web at: http://weather.gov/mob
Hazardous Weather Outlook...UPDATED National Weather Service Mobile AL 335 AM CDT Thu Sep 6 2018 ALZ051>060-261>266-FLZ201>206-MSZ067-075-076-078-079-070845- Choctaw-Washington-Clarke-Wilcox-Monroe-Conecuh-Butler-Crenshaw- Escambia-Covington-Mobile Inland-Baldwin Inland-Mobile Central- Baldwin Central-Mobile Coastal-Baldwin Coastal-Escambia Inland- Escambia Coastal-Santa Rosa Inland-Santa Rosa Coastal- Okaloosa Inland-Okaloosa Coastal-Wayne-Perry-Greene-Stone-George- 335 AM CDT Thu Sep 6 2018 This Hazardous Weather Outlook is for portions of south central Alabama...southwest Alabama...northwest Florida and southeast Mississippi. .DAY ONE...Today and Tonight There is a moderate risk for rip currents along the gulf beaches of Alabama and Northwest Florida through tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Friday through Wednesday There is a moderate risk for rip currents along the gulf beaches of Alabama and Northwest Florida through the weekend. .SPOTTER INFORMATION STATEMENT... Activation of SkyWarn Severe Storm Spotter networks is not expected through Wednesday. GMZ630>636-650-655-670-675-070845- Northern Mobile Bay-Southern Mobile Bay-Mississippi Sound- Perdido Bay-Pensacola Bay System-Western Choctawhatchee Bay- Eastern Choctawhatchee Bay- Coastal waters from Pensacola FL to Pascagoula MS out 20 NM- Coastal waters from Okaloosa Walton County Line FL to Pensacola FL out 20 NM- Waters from Pensacola FL to Pascagoula MS from 20 to 60 NM- Waters from Okaloosa Walton County Line FL to Pensacola FL from 20 to 60 NM- 335 AM CDT Thu Sep 6 2018 This Hazardous Weather Outlook is for portions of the coastal waters of Alabama and northwest Florida. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
559 PM CDT THU SEP 6 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0550 PM FLASH FLOOD 3 W THOMASVILLE 31.91N 87.79W
09/06/2018 CLARKE AL EMERGENCY MNGR
HIGH WATER OVER TALLAHATTA SPRINGS RD.
&&
MBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MOBILE AL
618 PM CDT THU SEP 6 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0612 PM FLASH FLOOD 1 NW RURAL 31.88N 87.76W
09/06/2018 CLARKE AL EMERGENCY MNGR
WATER OVER HIGHWAY 154 NEAR DUMMY LINE RD.
&&
MBThe Birmingham radar (KBMX), 146 km away, was scanning. The volume nearest the first event began at 23:24 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused flooding across northeastern Clarke County. Water covered several roads in the area. In Grove Hill, there was 6 inches of flowing water over the intersection of Church Street and Foscue Avenue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Alabama in 2018Every state in 2018This day in weather historyWarnings in Alabama, September 2018
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: 785153.