Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 142, NWS Morristown, TN

July 24, 1999Claiborne County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 24, 1999, 1:45 PM EDT for Claiborne County, Tennessee. It was in force for 25 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 24, 1999, 1:45 PM EDT (17:45 UTC)
Expired
Jul 24, 1999, 2:10 PM EDT
In force
25 min
Issued by
NWS Morristown, TN
Area
Whole counties

County Claiborne County, TN

The radar

The Knoxville radar (KMRX), 42 km from the middle of the area, began a volume at 17:45 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.

What was reported inside it

TimeReportWhereRemark
Jul 24, 1:50 PM EDTThunderstorm WindCumberland Gap, TN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 12:00Z, 5.8 hours before the alert went out and 328 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 1999-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 572 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 1999-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
572 J/kg
Mixed-layer CIN
-91 J/kg
Mixed-layer LCL
1170 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 12:37 PM EDTSevere Thunderstorm WarningMRXClaiborne63 min
Jul 24, 1:24 PM EDTSevere Thunderstorm WarningMRXCampbell31 min
Jul 24, 1:36 PM EDTFlash Flood WarningMRXRhea119 min
Jul 24, 1:55 PM EDTFlash Flood WarningMRXAnderson2 hr
Jul 24, 2:00 PM EDTSevere Thunderstorm WarningMRXKnox, Union30 min
Jul 24, 2:25 PM EDTSevere Thunderstorm WarningMRXGrainger, Hamblen, Jefferson35 min
Jul 24, 2:31 PM EDTSevere Thunderstorm WarningMRXKnox29 min
Jul 24, 2:45 PM EDTSevere Thunderstorm WarningMRXBlount, Sevier35 min
Jul 24, 2:50 PM EDTSevere Thunderstorm WarningMRXHawkins, Sullivan35 min
Jul 24, 3:48 PM EDTFlash Flood WarningMRXCarter, Johnson2 hr
Jul 24, 3:48 PM EDTFlash Flood WarningMRXUnicoi2 hr

Nearby

Severe Thunderstorm Warnings in Tennessee, 1999Every severe thunderstorm warning in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.