Alert archive / Alabama / Flash Flood Warnings in 2024
Flash Flood Warning 9, NWS Huntsville, AL
NWS Huntsville, AL issued this flash flood warning at May 27, 2024, 5:20 AM CDT for DeKalb County, Marshall County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 27, 2024, 5:20 AM CDT (10:20 UTC)
- Expired
- May 27, 2024, 8:18 AM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties DeKalb County, AL, Marshall County, AL
The radar
The Northeast Alabama radar (KHTX), 58 km from the middle of the area, began a volume at 10:20 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 10.3 hours before the alert went out and 153 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1594 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 1387 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.1
What forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at May 27, 12:18 AM CDT, 5 hours 2 minutes earlier.
Area forecast discussion, May 27, 12:18 AM CDT, 5 hours 2 minutes before
Area Forecast Discussion National Weather Service Huntsville AL 1218 AM CDT Mon May 27 2024 ...New AVIATION... .NEAR TERM... (rest of Tonight) Issued at 1055 PM CDT Sun May 26 2024 We're are sending this out earlier than normal, given high chances of severe weather as we go into the overnight. As of this writing, severe storms were raging from SW Illinois, western Kentucky, and SE Missouri. Tornado Watch #326 has recently been issued for our Tennessee counties (Lincoln, Moore, Franklin) until 5 AM. The latest model trends has a Quasi-Linear Convective System (squall line) nearing far NW Alabama around midnight. Some of the models were hinting at cellular development before the main line arrives. In either case, all modes of severe weather (wind gusts greater than 60 mph, hail larger than 1", tornadoes) are possible. Discrete cells preceding the line will be be more tornado prone in our sheared and unstable environment. The line should rapidly move across the area in a NW-SE orientation in the overnight. New guidance has slowed down the progress of the QLCS to the SE, now hinting 1AM-4AM timeframe. The latter time, especially if tornadoes occurs could become more of an issue given the very late hour of occurrence. && .SHORT TERM... (Monday through Wednesday) Issued at 1055 PM CDT Sun May 26 2024 Given severe weather, only minor changes made this period. Shower and thunderstorm activity should wind down Memorial Day Monday, as a line of convection heads further to the south and east. A cold front should move across the area during the course of the day from NW-SE, with shower activity winding down. Dry and slightly cooler conditions will return Mon evening and continue into the midweek. Highs in the mid 80s on Mon/Tue will only rise to near 80 on Wed. Lows will range in the upper 50s to mid 60s. && .LONG TERM... (Wednesday night through Sunday) Issued at 1055 PM CDT Sun May 26 2024 Dry air continues through the end of the week as upper level ridging moves into the Tennessee Valley from the west. On Friday evening, an upper level shortwave allows low-medium rain chances to return to the area and continue through the weekend. During the long term period, highs are forecast to be in the upper 70s/80s with overnight lows in the 50s/60s. && .AVIATION... (06Z TAFS) Issued at 1218 AM CDT Mon May 27 2024 As of TAF issuance, t-storms were forming over NW AL moving east around 20kt. Additional development is possible early in the TAF. A stronger line of convection extending from SW of Memphis, to Jackson TN and Nashville heading to the ESE. This convection should reach NW AL ~07-08Z, and NE AL 10-12Z. Storms could become severe with damaging winds and hail, torrential rain, and a tornado risk. Have noted variable gusty winds for the stronger storms in the overnight. Shower activity should end from NW to SE later today, as a cold front sweeps across the area. SW winds of 5-10kt overnight should veer to the west, then WNW by Mon evening. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...None. TN...None. && NEAR TERM...RSB SHORT TERM....RSB LONG TERM....HC AVIATION...RSB
In the hours before
Special weather statement, May 27, 4:42 AM CDT, 38 minutes before
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</html>The office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 12:46 AM CDT | Severe Thunderstorm Warning | HUN | Lauderdale, Lawrence, Limestone, Madison | 44 min |
| May 27, 1:28 AM CDT | Severe Thunderstorm Warning | HUN | Jackson, Limestone, Madison | 62 min |
| May 27, 1:31 AM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lawrence, Limestone, Morgan | 44 min |
| May 27, 1:49 AM CDT | Severe Thunderstorm Warning | HUN | Colbert, Franklin, Lauderdale | 56 min |
| May 27, 1:51 AM CDT | Tornado Warning | HUN | Jackson, Madison | 39 min |
| May 27, 2:08 AM CDT | Severe Thunderstorm Warning | HUN | Lawrence, Limestone, Madison, Morgan | 37 min |
| May 27, 2:25 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson, Madison | 65 min |
| May 27, 2:27 AM CDT | Tornado Warning | HUN | Jackson | 48 min |
| May 27, 2:41 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, Franklin, Lawrence, Limestone, Madison, Morgan | 34 min |
| May 27, 2:49 AM CDT | Tornado Warning | HUN | Jackson | 26 min |
| May 27, 3:04 AM CDT | Tornado Warning | HUN | Jackson, Madison | 26 min |
| May 27, 3:06 AM CDT | Flash Flood Warning | HUN | Jackson, Lawrence, Limestone, Madison, Morgan | 3 hr |
| May 27, 3:10 AM CDT | Tornado Warning | HUN | Jackson, Madison, Marshall | 35 min |
| May 27, 3:20 AM CDT | Tornado Warning | HUN | DeKalb, Madison, Marshall | 25 min |
| May 27, 3:27 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, DeKalb, Jackson, Marshall, Morgan | 48 min |
| May 27, 3:30 AM CDT | Tornado Warning | HUN | Cullman, Marshall, Morgan | 30 min |
| May 27, 3:41 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 34 min |
| May 27, 4:12 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, DeKalb, Marshall | 33 min |
| May 27, 4:42 AM CDT | Special Weather Statement | HUN | DeKalb | 48 min |
Nearby
Flash Flood Warnings in Alabama, 2024Every flash flood warning in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.