Alert archive / Alabama / Areal Flood Warnings in 2021
Areal Flood Warning 40, NWS Huntsville, AL
NWS Huntsville, AL issued this areal flood warning at Aug 19, 2021, 7:58 PM CDT for Franklin County, Alabama. It was in force for 4 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
- Aug 19, 2021, 7:58 PM CDT (00:58 UTC)
- Expired
- Aug 20, 2021, 12:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Franklin County, AL
The radar
The Columbus AFB radar (KGWX), 75 km from the middle of the area, began a volume at 00:57 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, 1.0 hours before the alert went out and 171 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
- 409 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 812 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal 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 areal flood warning went out at Aug 19, 6:35 PM CDT, 1 hour 23 minutes earlier.
Area forecast discussion, Aug 19, 6:35 PM CDT, 1 hour 23 minutes before
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</html>Hazardous weather outlook, Aug 19, 1:28 PM CDT, 6 hours 30 minutes before
Hazardous Weather Outlook National Weather Service Huntsville AL 128 PM CDT Thu Aug 19 2021 ALZ001>010-016-TNZ076-096-097-201100- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN- 128 PM CDT Thu Aug 19 2021 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...Tonight... Isolated to scattered thunderstorms could redevelop this evening, but most areas will remain storm free. Patchy dense fog is possible late tonight. .DAYS TWO THROUGH SEVEN...Friday through Wednesday... Scattered to numerous thunderstorms are expected at times Friday into Saturday. Locally heavy rainfall and gusty winds will be possible at times. Isolated to scattered mainly afternoon thunderstorms are possible Monday through Wednesday. .SPOTTER INFORMATION STATEMENT... Activation of storm spotters and emergency management personnel is not anticipated at this time.
In the hours before
Local storm report, Aug 19, 5:57 PM CDT, 2 hours 1 minute before
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</html>Local storm report, Aug 19, 5:59 PM CDT, 1 hour 59 minutes before
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</html>Local storm report, Aug 19, 6:03 PM CDT, 1 hour 55 minutes before
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</html>Local storm report, Aug 19, 6:06 PM CDT, 1 hour 52 minutes before
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</html>Special weather statement, Aug 19, 6:18 PM CDT, 1 hour 40 minutes before
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</html>Special weather statement, Aug 19, 6:45 PM CDT, 1 hour 13 minutes before
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</html>Nearby
Areal Flood Warnings in Alabama, 2021Every areal flood warning in 2021
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.