Alert archive / Tennessee / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 358, NWS Morristown, TN

June 15, 1998Polk County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Jun 15, 1998, 3:16 AM EDT for Polk County, Tennessee. It was in force for 64 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: Jun 15, 1998, 3:16 AM EDT (07:16 UTC)
Expired: Jun 15, 1998, 4:20 AM EDT
In force: 64 min
Issued by: NWS Morristown, TN
Area: Whole counties

County Polk County, TN

What was reported inside it

Time	Report	Where	Remark
Jun 15, 3:45 AM EDT	Thunderstorm Wind	Copperhill, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 15, 2:00 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 7.3 hours before the alert went out and 219 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: 3344 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 936 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 451 m²/s²
0-3 km storm-relative helicity: 509 m²/s²
Significant tornado parameter: 11.0
Supercell composite: 67.6

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 Jun 14, 2:40 PM EDT, 12 hours 36 minutes earlier.

Area forecast discussion, Jun 14, 2:40 PM EDT, 12 hours 36 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
Jun 15, 1:08 AM EDT	Severe Thunderstorm Warning	MRX	Fentress	32 min
Jun 15, 1:18 AM EDT	Severe Thunderstorm Warning	MRX	Cumberland	47 min
Jun 15, 1:31 AM EDT	Severe Thunderstorm Warning	MRX	Morgan	49 min
Jun 15, 1:39 AM EDT	Severe Thunderstorm Warning	MRX	Scott	31 min
Jun 15, 2:09 AM EDT	Severe Thunderstorm Warning	MRX	Anderson, Roane	61 min
Jun 15, 2:09 AM EDT	Severe Thunderstorm Warning	MRX	Campbell	61 min
Jun 15, 2:36 AM EDT	Severe Thunderstorm Warning	MRX	Knox, Union	34 min
Jun 15, 2:36 AM EDT	Severe Thunderstorm Warning	MRX	Claiborne	34 min
Jun 15, 2:44 AM EDT	Severe Thunderstorm Warning	MRX	Hamilton	31 min
Jun 15, 2:58 AM EDT	Severe Thunderstorm Warning	MRX	Bradley	47 min
Jun 15, 3:10 AM EDT	Severe Thunderstorm Warning	MRX	Hamblen, Hawkins, Jefferson	35 min
Jun 15, 3:10 AM EDT	Severe Thunderstorm Warning	MRX	Sevier	35 min
Jun 15, 3:10 AM EDT	Severe Thunderstorm Warning	MRX	Hancock	35 min
Jun 15, 1:58 PM EDT	Severe Thunderstorm Warning	MRX	Scott	47 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1998 Every severe thunderstorm warning in 1998

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.