Alert archive / Tennessee / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 234, NWS Morristown, TN

July 21, 1997Hamilton County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jul 21, 1997, 7:28 PM EDT for Hamilton County, 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
Jul 21, 1997, 7:28 PM EDT (23:28 UTC)
Expired
Jul 21, 1997, 8:30 PM EDT
In force
62 min
Issued by
NWS Morristown, TN
Area
Whole counties

County Hamilton County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 11.5 hours before the alert went out and 167 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 1997-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1683 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 1997-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 square meters per square second.1939Sfc1 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
1683 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
33 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.

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, 2:15 PM EDT, 5 hours 13 minutes earlier.

Area forecast discussion, Jul 21, 2:15 PM EDT, 5 hours 13 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KNOXVILLE/TRI-CITIES TN
215 PM EDT MON JUL 21 1997

BIG QUESTION CONTINUES TO BE WHAT AFFECTS WILL BE FELT FROM DANNY.
REMAINDER OF THIS AFTERNOON INTO THE EARLY EVENING SCATTERED PRECIP
MAINLY ALONG THE MOUNTAIN BACKBONE AND INTO CHEROKEE AND CLAY
COUNTIES OF SW NC.  PHAZING OF NORTHERN STREAM AND DANNY LIKELY TO
OCCUR TUE AFTERNOON/EVENING WITH GOOD PVA AND STRONG VV.

WITH ALL THIS IN MIND...LOOKS LIKE 30 PERCENT TONIGHT IS A GOOD
BET AND 60S OVER MOST OF THE FA ON TUESDAY/TUESDAY NIGHT AND
LIKELY ON WEDNESDAY.

TEMPS WILL MODIFY SOMEWHAT DUE TO INCREASED CLOUDCOVER AND PRECIPITATION
IN THE REGION...MID TO UPPER 80S...IN OTHER WORDS...FAN NUMBERS LOOK
THE BEST.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 4:04 PM EDTSevere Thunderstorm WarningMRXWise26 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1997Every severe thunderstorm warning in 1997

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.