Alert archive / Tennessee / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 30, NWS Morristown, TN

July 1, 1990Roane County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 1, 1990, 3:51 PM EDT for Roane County, Tennessee. It was in force for 69 min.

The area

The counties it named.

The facts

Issued
Jul 1, 1990, 3:51 PM EDT (19:51 UTC)
Expired
Jul 1, 1990, 5:00 PM EDT
In force
69 min
Issued by
NWS Morristown, TN
Area
Whole counties

County Roane County, TN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 189 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, Nashville Metro, TN at 12:00Z on 1990-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1103 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, Nashville Metro, TN at 12:00Z on 1990-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 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
1103 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1382 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
117 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 1, 2:35 PM EDTSevere Thunderstorm WarningMRXBlount, Loudon, Monroe55 min
Jul 1, 3:00 PM EDTSevere Thunderstorm WarningMRXCumberland60 min
Jul 1, 4:03 PM EDTSevere Thunderstorm WarningMRXMonroe42 min
Jul 1, 4:20 PM EDTSevere Thunderstorm WarningMRXBlount, Loudon55 min
Jul 1, 5:42 PM EDTSevere Thunderstorm WarningMRXClaiborne63 min
Jul 1, 6:40 PM EDTSevere Thunderstorm WarningMRXAnderson65 min
Jul 1, 7:10 PM EDTSevere Thunderstorm WarningMRXGrainger, Jefferson65 min
Jul 1, 7:28 PM EDTSevere Thunderstorm WarningMRXKnox, Loudon47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1990Every severe thunderstorm warning in 1990

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.