Alert archive / Tennessee / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 200, NWS Morristown, TN

October 19, 20074 counties in Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Oct 19, 2007, 2:43 AM EDT for 4 counties in Tennessee. It was in force for 62 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, 2:43 AM EDT (06:43 UTC)
Expired: Oct 19, 2007, 3:45 AM EDT
In force: 62 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

Counties Campbell County, TN, Morgan County, TN, Roane County, TN, Scott County, TN

The radar

The Knoxville radar (KMRX), 95 km from the middle of the area, began a volume at 06:46 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 19, 2:26 AM EDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 6.7 hours before the alert went out and 193 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, 3:24 PM EDT, 11 hours 19 minutes earlier.

Area forecast discussion, Oct 18, 3:24 PM EDT, 11 hours 19 minutes before

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Hazardous weather outlook, Oct 18, 5:30 AM EDT, 21 hours 13 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, 2:15 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Marion, Sequatchie	60 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.