Alert archive / Alabama / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 51, NWS Huntsville, AL
NWS Huntsville, AL issued this severe thunderstorm warning at May 20, 2018, 7:47 PM CDT for Franklin County, Alabama. It was in force for 28 min. 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 20, 2018, 7:47 PM CDT (00:47 UTC)
- Expired
- May 20, 2018, 8:15 PM CDT
- In force
- 28 min
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Franklin County, AL
The radar
The Columbus AFB radar (KGWX), 75 km from the middle of the area, began a volume at 00:51 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
Nashville Metro, TN (KBNA), launched 00:00Z, 0.8 hours before the alert went out and 219 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
- 746 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 993 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 20, 6:32 PM CDT, 1 hour 15 minutes earlier.
Area forecast discussion, May 20, 6:32 PM CDT, 1 hour 15 minutes before
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</html>Hazardous weather outlook, May 20, 2:18 PM CDT, 5 hours 29 minutes before
Hazardous Weather Outlook National Weather Service Huntsville AL 218 PM CDT Sun May 20 2018 ALZ001>010-016-TNZ076-096-097-211000- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN- 218 PM CDT Sun May 20 2018 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...This afternoon and Tonight... Scattered thunderstorms will continue this afternoon and evening. Gusty winds to 50 PH, small hail, lightning, and very heavy rainfall will be the primary threats. .DAYS TWO THROUGH SEVEN...Monday through Saturday... Isolated to scattered thunderstorms are expected each day this week, with the greatest coverage occurring from the late morning into the early evening hours. Brief gusty winds, lightning, and heavy rainfall will be the main threats with this activity. .SPOTTER CALL TO ACTION STATEMENT... Activation of storm spotters and emergency management personnel is not anticipated at this time.
In the hours before
Local storm report, May 20, 5:01 PM CDT, 2 hours 46 minutes before
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</html>Local storm report, May 20, 5:03 PM CDT, 2 hours 44 minutes before
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</html>Local storm report, May 20, 5:07 PM CDT, 2 hours 40 minutes before
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</html>Local storm report, May 20, 5:19 PM CDT, 2 hours 28 minutes before
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</html>Special weather statement, May 20, 5:27 PM CDT, 2 hours 20 minutes before
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</html>Special weather statement, May 20, 6:42 PM CDT, 1 hour 5 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 20, 7:44 PM CDT | Special Weather Statement | HUN | Franklin | 31 min |
| May 20, 8:15 PM CDT | Special Weather Statement | HUN | Franklin | 15 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 2018Every severe thunderstorm warning in 2018
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.