Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 12, NWS Huntsville, AL

February 5, 2020DeKalb County, Jackson County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Feb 5, 2020, 10:55 AM CST for DeKalb County, Jackson County, Alabama. It was in force for 20 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
Feb 5, 2020, 10:55 AM CST (16:55 UTC)
Expired
Feb 5, 2020, 11:15 AM CST
In force
20 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties DeKalb County, AL, Jackson County, AL

The radar

The Northeast Alabama radar (KHTX), 38 km from the middle of the area, began a volume at 16:58 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 12:00Z, 4.9 hours before the alert went out and 179 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.

Skew-T log-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2020-02-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 125 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2020-02-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 274 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
125 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
280 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

Open this sounding in Storm Lab

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 Feb 5, 10:49 AM CST, 6 minutes earlier.

Area forecast discussion, Feb 5, 10:49 AM CST, 6 minutes before
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Hazardous weather outlook, Feb 5, 4:20 AM CST, 6 hours 35 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
420 AM CST Wed Feb 5 2020

ALZ001>010-016-TNZ076-096-097-061000-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
420 AM CST Wed Feb 5 2020

This Hazardous Weather Outlook is for north Alabama and portions of
southern middle Tennessee.

.DAY ONE...Today and Tonight...

Scattered embedded thunderstorms within numerous to widespread
showers are expected later today into this evening. A few of these
storms could be severe and will be capable of damaging winds along
with hail and a few tornadoes. The threat for severe weather will be
from late this afternoon through the late evening.

In addition, locally heavy downpours in a short period of time could
lead to a few instances of flash flooding. Resulting runoff may also
result in minor flooding of area rivers and streams.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

No hazardous weather is expected at this time.

.SPOTTER CALL TO ACTION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible later today into this evening.

In the hours before

Special weather statement, Feb 5, 9:08 AM CST, 1 hour 47 minutes before
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Special weather statement, Feb 5, 9:53 AM CST, 1 hour 2 minutes before
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Special weather statement, Feb 5, 10:09 AM CST, 46 minutes before
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Special weather statement, Feb 5, 10:23 AM CST, 32 minutes before
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Special weather statement, Feb 5, 10:32 AM CST, 23 minutes before
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Special weather statement, Feb 5, 10:52 AM CST, 3 minutes before
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The office that day

Everything else NWS Huntsville, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 5, 6:44 AM CSTSpecial Weather StatementHUNCullman31 min
Feb 5, 8:19 AM CSTSpecial Weather StatementHUNMadison, Morgan26 min
Feb 5, 8:38 AM CSTSpecial Weather StatementHUNMorgan37 min
Feb 5, 8:45 AM CSTFlash Flood WatchHUNColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more26 hr
Feb 5, 9:08 AM CSTSpecial Weather StatementHUNMadison, Morgan52 min
Feb 5, 9:53 AM CSTSpecial Weather StatementHUNJackson52 min
Feb 5, 10:09 AM CSTSpecial Weather StatementHUNMadison36 min
Feb 5, 10:23 AM CSTSpecial Weather StatementHUNMadison22 min
Feb 5, 10:32 AM CSTSpecial Weather StatementHUNColbert, Franklin43 min
Feb 5, 10:39 AM CSTAreal Flood WarningHUNJackson, Madison12 hr
Feb 5, 10:52 AM CSTSpecial Weather StatementHUNJackson38 min
Feb 5, 10:55 AM CSTRiver Flood WarningHUNMadison50 hr
Feb 5, 11:00 AM CSTRiver Flood WarningHUNLawrence62 hr
Feb 5, 11:11 AM CSTSpecial Weather StatementHUNLimestone49 min
Feb 5, 11:18 AM CSTSpecial Weather StatementHUNLawrence42 min
Feb 5, 11:53 AM CSTAreal Flood WarningHUNMadison6 hr
Feb 5, 11:57 AM CSTSpecial Weather StatementHUNLimestone48 min
Feb 5, 12:00 PM CSTSpecial Weather StatementHUNLimestone45 min
Feb 5, 1:53 PM CSTAreal Flood WarningHUNFranklin6 hr
Feb 5, 4:53 PM CSTSevere Thunderstorm WarningHUNColbert, Franklin, Lauderdale52 min
Feb 5, 4:55 PM CSTSpecial Weather StatementHUNFranklin50 min
Feb 5, 5:08 PM CSTTornado WarningHUNColbert, Lauderdale37 min
Feb 5, 5:41 PM CSTSpecial Weather StatementHUNColbert, Lauderdale, Lawrence49 min
Feb 5, 5:45 PM CSTAreal Flood WarningHUNMadison4 hr
Feb 5, 5:55 PM CSTAreal Flood WarningHUNColbert, Franklin, Lauderdale, Lawrence9 hr
Feb 5, 12:43 PM CSTSpecial Weather StatementHUNFranklin, Moore47 min
Feb 5, 1:01 PM CSTSpecial Weather StatementHUNFranklin29 min
Feb 5, 1:27 PM CSTSpecial Weather StatementHUNFranklin33 min
Feb 5, 2:02 PM CSTAreal Flood WarningHUNMoore6 hr
Feb 5, 3:08 PM CSTRiver Flood WarningHUNFranklin, Lincoln46 hr

Nearby

Severe Thunderstorm Warnings in Alabama, 2020Every severe thunderstorm warning in 2020

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.