Alert archive / Tennessee / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 199, NWS Morristown, TN

October 19, 2007Bledsoe County, Marion County, Sequatchie County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Oct 19, 2007, 1:15 AM CDT for Bledsoe County, Marion County, Sequatchie County, Tennessee. It was in force for 60 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: Oct 19, 2007, 1:15 AM CDT (06:15 UTC)
Expired: Oct 19, 2007, 2:15 AM CDT
In force: 60 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Bledsoe County, TN, Marion County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 78 km from the middle of the area, began a volume at 06:15 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, 6.3 hours before the alert went out and 137 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: 1487 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 778 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 337 m²/s²
Significant tornado parameter: 2.8
Supercell composite: 10.5

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 Morristown, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 18, 2:24 PM CDT, 10 hours 51 minutes earlier.

Area forecast discussion, Oct 18, 2:24 PM CDT, 10 hours 51 minutes before

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Hazardous weather outlook, Oct 18, 4:30 AM CDT, 20 hours 45 minutes before

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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 19, 1:43 AM CDT	Severe Thunderstorm Warning	MRX	Campbell, Morgan, Roane, Scott	62 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2007 Every severe thunderstorm warning in 2007

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.