Alert archive / Tennessee / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 131, NWS Morristown, TN

July 21, 2013Bledsoe County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 21, 2013, 1:30 PM CDT for Bledsoe County, Tennessee. It was in force for 30 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 21, 2013, 1:30 PM CDT (18:30 UTC)
Expired: Jul 21, 2013, 2:00 PM CDT
In force: 30 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon

County Bledsoe County, TN

The radar

The Northeast Alabama radar (KHTX), 109 km from the middle of the area, began a volume at 18:31 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, 6.5 hours before the alert went out and 139 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: 1985 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 21, 12:36 PM CDT, 54 minutes earlier.

Area forecast discussion, Jul 21, 12:36 PM CDT, 54 minutes before

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Hazardous weather outlook, Jul 21, 4:00 AM CDT, 9 hours 30 minutes before

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In the hours before

Special weather statement, Jul 21, 8:30 AM CDT, 5 hours 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
Jul 20, 10:33 PM CDT	Areal Flood Advisory	MRX	Blount	117 min
Jul 21, 11:34 AM CDT	Flash Flood Warning	MRX	Rhea	4 hr
Jul 21, 2:29 PM CDT	Areal Flood Advisory	MRX	Hamilton	2 hr
Jul 21, 3:24 PM CDT	Severe Thunderstorm Warning	MRX	Polk	36 min
Jul 21, 3:46 PM CDT	Areal Flood Advisory	MRX	Polk	119 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2013 Every severe thunderstorm warning in 2013

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.