Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 138, NWS Nashville, TN

May 23, 1999Putnam County, Smith County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 23, 1999, 5:40 PM CDT for Putnam County, Smith County, Tennessee. It was in force for 35 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: May 23, 1999, 5:40 PM CDT (22:40 UTC)
Expired: May 23, 1999, 6:15 PM CDT
In force: 35 min
Issued by: NWS Nashville, TN
Area: Whole counties

Counties Putnam County, TN, Smith County, TN

The radar

The Nashville radar (KOHX), 75 km from the middle of the area, began a volume at 22:42 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.

What was reported inside it

Time	Report	Where	Remark
May 23, 5:45 PM CDT	Thunderstorm Wind 50	Lancaster, TN	Trees and power lines were down.
May 23, 6:20 PM CDT	Thunderstorm Wind 50	Silver Pt, TN	Trees were blown down.

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
May 23, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.7 hours before the alert went out and 79 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 922 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 109 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 Nashville, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at May 23, 1:00 PM CDT, 4 hours 40 minutes earlier.

Area forecast discussion, May 23, 1:00 PM CDT, 4 hours 40 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
100 PM CDT SUN MAY 23 1999

LATEST SURFACE ANALYSIS PLACES COLD FRONT NEAR STL-LIT LINE WITH WELL
DEFINED BOUNDARY AHEAD NEAR THE MS RIVER.  CONVECTION CURRENTLY
FIRING ACROSS N AL/SRN TN IN MORE UNSTABLE AIR IN AREA OF MESO LOW
WITH VERY LITTLE ACTIVITY ELSEWHERE. MODELS IN VERY GOOD AGREEMENT
SHORT TERM AND BELIEVE MAIN SURGE OF SHOWER/TSTORM DEVELOPMENT WILL
COME WITH THIS PRE-FRONTAL BOUNDARY/MESO LOW FEATURE...WHICH MESHS
QUITE WELL WITH MOVEMENT OF MD/UPR SUPPORT.  MD/UPR TROF AXES SHUD
PUSH BY BNA AROUND 00Z AND BY CSV BEFORE 06Z.  BELIEVE WITH STRENGTH
OF MD/UPR LEVEL PUSH...CHANCE OF PRECIP SHUD BE OVER BY MIDNIGHT
EXCEPT POSSIBLY FAR E AS AIRMASS STABILIZES RAPIDLY 06-12Z MON. WILL
WORD ZONES ACCORDINGLY.

WEAK SURFACE HIGH...DRY AIR...AND MD/UPR LEVEL NW FLO SHUD PROVIDE
FAIR WX ON MONDAY WITH A COMFORTABLE COOL DOWN.

PROGGS...ESPECIALLY ETA/NGM...TRY TO DEVELOP A SECONDARY WEAK TROF
MONDAY NIGHT WHICH SHUD MOVE ACROSS CWA ON TUESDAY. THIS FEATURE HAS
SOME FAIRLY DECENT LOW/MD MOISTURE BUT LITTLE IF ANY MD/UPR
SUPPORT...BUT WE KNOW HOW UNFRIENDLY UPR LEVEL NW FLOW CAN BE. AT
THIS POINT...BELIEVE CHANCES ARE VERY SMALL AND HAVE ELECTED TO LEAVE
OUT IN FAVOR OF LATER RUNS.

SVR STORM WATCH CURRENTLY RUNNING FOR MOST OF FA.  WILL SEND 4PM
ZONES AS LATE AS POSSIBLY TO COVER ANY CHANGES.  PROBABLY 1ST SET
AROUND 230 PM AND ANY ADDITIONAL UPDATES AS NEEDED.  07

BNA 56/74/54/76 3001
CSV 54/70/49/71 5000

In the hours before

Local storm report, May 23, 3:45 PM CDT, 1 hour 55 minutes before

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Local storm report, May 23, 3:45 PM CDT, 1 hour 55 minutes before

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Local storm report, May 23, 3:50 PM CDT, 1 hour 50 minutes before

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Local storm report, May 23, 3:50 PM CDT, 1 hour 50 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 1:25 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	65 min
May 23, 1:32 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Franklin	28 min
May 23, 2:10 PM CDT	Severe Thunderstorm Warning	OHX	Wilson	50 min
May 23, 2:43 PM CDT	Flash Flood Warning	OHX	Grundy	4 hr
May 23, 4:48 PM CDT	Severe Thunderstorm Warning	OHX	Trousdale, Wilson	27 min
May 23, 5:10 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Wilson	35 min
May 23, 5:50 PM CDT	Tornado Warning	OHX	DeKalb, Putnam, Smith	40 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.