Alert archive / Tennessee / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 291, NWS Morristown, TN

October 25, 1997Hamilton County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Oct 25, 1997, 4:01 AM EDT for Hamilton County, Tennessee. It was in force for 59 min. 2 reports 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: Oct 25, 1997, 4:01 AM EDT (08:01 UTC)
Expired: Oct 25, 1997, 5:00 AM EDT
In force: 59 min
Issued by: NWS Morristown, TN
Area: Whole counties

County Hamilton County, TN

What was reported inside it

Time	Report	Where	Remark
Oct 25, 4:25 AM EDT	Hail 1	Signal Mtn, TN
Oct 25, 5:05 AM EDT	Hail 0.75	East Brainerd, 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

Nashville Metro, TN (KBNA), launched 00:00Z, 8.0 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-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: 198 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 225 m²/s²
0-3 km storm-relative helicity: 295 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.5

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 Oct 25, 2:39 AM EDT, 1 hour 22 minutes earlier.

Area forecast discussion, Oct 25, 2:39 AM EDT, 1 hour 22 minutes before

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In the hours before

Special weather statement, Oct 25, 3:50 AM EDT, 11 minutes before

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Special weather statement, Oct 25, 3:54 AM EDT, 7 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 25, 4:55 AM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	50 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1997 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.