Alert archive / Tennessee / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 192, NWS Huntsville, AL

July 31, 2008Franklin County, Tennessee

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 31, 2008, 1:46 PM CDT for Franklin County, Tennessee. It was in force for 29 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: Jul 31, 2008, 1:46 PM CDT (18:46 UTC)
Expired: Jul 31, 2008, 2:15 PM CDT
In force: 29 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 25 km from the middle of the area, began a volume at 18:45 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 12:00Z, 6.8 hours before the alert went out and 118 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: 1495 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 518 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 Jul 31, 12:32 PM CDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 31, 12:32 PM CDT, 1 hour 14 minutes before

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Hazardous weather outlook, Jul 31, 4:05 AM CDT, 9 hours 41 minutes before

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In the hours before

Special weather statement, Jul 31, 1:05 PM CDT, 41 minutes before

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Special weather statement, Jul 31, 1:17 PM CDT, 29 minutes before

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Special weather statement, Jul 31, 1:28 PM CDT, 18 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
Jul 31, 1:01 PM CDT	Severe Thunderstorm Warning	HUN	Madison	77 min
Jul 31, 1:43 PM CDT	Severe Thunderstorm Warning	HUN	Madison	17 min
Jul 31, 4:24 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	36 min
Jul 31, 4:39 PM CDT	Severe Thunderstorm Warning	HUN	Limestone	51 min
Jul 31, 5:12 PM CDT	Severe Thunderstorm Warning	HUN	Madison	33 min
Jul 31, 5:22 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	23 min
Jul 31, 5:23 PM CDT	Flash Flood Warning	HUN	Limestone	92 min
Jul 31, 5:45 PM CDT	Severe Thunderstorm Warning	HUN	Lawrence, Limestone, Morgan	20 min
Jul 31, 1:25 PM CDT	Severe Thunderstorm Warning	HUN	Franklin	20 min
Jul 31, 5:29 PM CDT	Tornado Warning	HUN	Lincoln	31 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2008 Every severe thunderstorm warning in 2008

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.