Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 63, NWS Nashville, TN

February 11, 1999Macon County, Trousdale County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Feb 11, 1999, 11:01 PM CST for Macon County, Trousdale County, Tennessee. It was in force for 49 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: Feb 11, 1999, 11:01 PM CST (05:01 UTC)
Expired: Feb 11, 1999, 11:50 PM CST
In force: 49 min
Issued by: NWS Nashville, TN
Area: Whole counties

Counties Macon County, TN, Trousdale County, TN

The radar

The Nashville radar (KOHX), 49 km from the middle of the area, began a volume at 05:02 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Feb 11, 8:00 PM CST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 5.0 hours before the alert went out and 59 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: 264 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 348 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.7

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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 11, 8:05 PM CST, 2 hours 56 minutes earlier.

Area forecast discussion, Feb 11, 8:05 PM CST, 2 hours 56 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
805 PM CST THU FEB 11 1999

TONIGHTS FCST UPDATE SHOULD CONSIST MAINLY OF JUST CLEANING UP SOME
WORDING TO AGREE WITH MOVEMENT OF CDFNT ACROSS OUR CWA.

BASED ON CURRENT MOVEMENT, EXPECT FNT TO BE NEAR A SPRINGFIELD TO
LAWRENCEBURG LINE AT 930 PM AND NEAR A LIVINGSTON...COOKEVILLE...
WINCHSTER LINE AT 1 AM CST.

WILL SHIP OVER AN UPDATED SET OF ZONES SHORTLY.

In the hours before

Local storm report, Feb 11, 9:28 PM CST, 1 hour 33 minutes before

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Local storm report, Feb 11, 9:28 PM CST, 1 hour 33 minutes before

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Local storm report, Feb 11, 9:34 PM CST, 1 hour 27 minutes before

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Local storm report, Feb 11, 10:07 PM CST, 54 minutes before

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Local storm report, Feb 11, 10:22 PM CST, 39 minutes before

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Special weather statement, Feb 11, 10:44 PM CST, 17 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 11, 6:53 PM CST	Severe Thunderstorm Warning	OHX	Benton, Decatur	62 min
Feb 11, 7:08 PM CST	Severe Thunderstorm Warning	OHX	Stewart	57 min
Feb 11, 7:25 PM CST	Severe Thunderstorm Warning	OHX	Houston, Humphreys	60 min
Feb 11, 7:39 PM CST	Tornado Warning	OHX	Stewart	51 min
Feb 11, 7:49 PM CST	Severe Thunderstorm Warning	OHX	Montgomery	61 min
Feb 11, 7:51 PM CST	Tornado Warning	OHX	Benton, Humphreys	49 min
Feb 11, 7:55 PM CST	Severe Thunderstorm Warning	OHX	Decatur	35 min
Feb 11, 8:05 PM CST	Severe Thunderstorm Warning	OHX	Perry	65 min
Feb 11, 8:05 PM CST	Severe Thunderstorm Warning	OHX	Dickson	65 min
Feb 11, 8:11 PM CST	Tornado Warning	OHX	Montgomery, Stewart	64 min
Feb 11, 8:40 PM CST	Severe Thunderstorm Warning	OHX	Cheatham, Robertson	80 min
Feb 11, 8:51 PM CST	Severe Thunderstorm Warning	OHX	Hickman, Lewis	64 min
Feb 11, 8:58 PM CST	Severe Thunderstorm Warning	OHX	Wayne	47 min
Feb 11, 9:26 PM CST	Severe Thunderstorm Warning	OHX	Davidson, Williamson	59 min
Feb 11, 10:21 PM CST	Severe Thunderstorm Warning	OHX	Sumner, Wilson	49 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1999 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.