Alert archive / Tennessee / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 66, NWS Huntsville, AL

June 21, 2020Franklin County, Moore County, Tennessee

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 21, 2020, 5:10 PM CDT for Franklin County, Moore County, Tennessee. It was in force for 16 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: Jun 21, 2020, 5:10 PM CDT (22:10 UTC)
Expired: Jun 21, 2020, 5:26 PM CDT
In force: 16 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, TN, Moore County, TN

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 10.2 hours before the alert went out and 232 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: 394 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Jun 21, 2:44 PM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Jun 21, 2:44 PM CDT, 2 hours 26 minutes before

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Hazardous weather outlook, Jun 21, 2:52 PM CDT, 2 hours 18 minutes before

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In the hours before

Special weather statement, Jun 21, 2:36 PM CDT, 2 hours 34 minutes before

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Local storm report, Jun 21, 2:59 PM CDT, 2 hours 11 minutes before

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Special weather statement, Jun 21, 3:09 PM CDT, 2 hours 1 minute before

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Local storm report, Jun 21, 3:11 PM CDT, 1 hour 59 minutes before

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Special weather statement, Jun 21, 4:24 PM CDT, 46 minutes before

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Special weather statement, Jun 21, 4:59 PM CDT, 11 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
Jun 21, 12:42 PM CDT	Special Weather Statement	HUN	Cullman	48 min
Jun 21, 1:16 PM CDT	Special Weather Statement	HUN	Cullman	44 min
Jun 21, 2:01 PM CDT	Special Weather Statement	HUN	DeKalb	44 min
Jun 21, 2:11 PM CDT	Special Weather Statement	HUN	Marshall	49 min
Jun 21, 2:36 PM CDT	Special Weather Statement	HUN	Jackson	39 min
Jun 21, 2:45 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Marshall	30 min
Jun 21, 3:09 PM CDT	Special Weather Statement	HUN	Jackson	51 min
Jun 21, 4:24 PM CDT	Special Weather Statement	HUN	Cullman	36 min
Jun 21, 4:59 PM CDT	Special Weather Statement	HUN	Franklin	46 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 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.