Alert archive / Alabama / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 35, NWS Huntsville, AL

April 8, 20204 counties in Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Apr 8, 2020, 6:39 PM CDT for 4 counties in Alabama. It was in force for 36 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: Apr 8, 2020, 6:39 PM CDT (23:39 UTC)
Expired: Apr 8, 2020, 7:15 PM CDT
In force: 36 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 106 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 170 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 392 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 Apr 8, 3:14 PM CDT, 3 hours 25 minutes earlier.

Area forecast discussion, Apr 8, 3:14 PM CDT, 3 hours 25 minutes before

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Hazardous weather outlook, Apr 8, 3:31 PM CDT, 3 hours 8 minutes before

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In the hours before

Special weather statement, Apr 8, 5:46 PM CDT, 53 minutes before

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Special weather statement, Apr 8, 6:34 PM CDT, 5 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 5:46 PM CDT	Special Weather Statement	HUN	Limestone	44 min
Apr 8, 6:05 PM CDT	Severe Thunderstorm Warning	HUN	Limestone, Madison	25 min
Apr 8, 6:26 PM CDT	Severe Thunderstorm Warning	HUN	Limestone, Madison	20 min
Apr 8, 6:34 PM CDT	Special Weather Statement	HUN	Limestone	41 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2020 Every 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.