Alert archive / Tennessee / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 233, NWS Nashville, TN

September 23, 2001Davidson County, Sumner County, Wilson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Sep 23, 2001, 9:06 PM CDT for Davidson County, Sumner County, Wilson County, Tennessee. It was in force for 24 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: Sep 23, 2001, 9:06 PM CDT (02:06 UTC)
Expired: Sep 23, 2001, 9:30 PM CDT
In force: 24 min
Issued by: NWS Nashville, TN
Area: Whole counties

Counties Davidson County, TN, Sumner County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 5 km from the middle of the area, began a volume at 02:08 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
Sep 23, 9:15 PM CDT	Hail 0.88	Mt Juliet, TN	Nickel size hail was reported.

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, 2.1 hours before the alert went out and 17 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: 1221 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1599 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

065 
WUUS54 KOHX 240207
SVRBNA
TNC037-165-189-240230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
906 PM CDT SUN SEP 23 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DAVIDSON COUNTY IN TENNESSEE
  SOUTHEASTERN SUMNER COUNTY IN TENNESSEE
  THIS INCLUDES THE CITY OF HENDERSONVILLE
  NORTHWESTERN WILSON COUNTY IN TENNESSEE
  THIS INCLUDES THE CITIES OF...MOUNT JULIET...LEBANON...GREEN HILL

* UNTIL 930 PM CDT

* AT 859 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF LAKEWOOD...OR ABOUT 5
  MILES EAST OF NASHVILLE...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MOUNT JULIET  AT 915 PM CDT

THIS THUNDERSTORM IS CAPABLE OF PRODUCING DAMAGING HAIL AND WINDS, WHICH 
MAY CAUSE INJURY AND PROPERTY DAMAGE. TAKE SHELTER IN A STURDY 
BUILDING AND AVOID WINDOWS.

$$

LAT...LON 3625 8677 3608 8670 3620 8619 3641 8628

JLM

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 Sep 23, 8:56 PM CDT, 10 minutes earlier.

Area forecast discussion, Sep 23, 8:56 PM CDT, 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
856 PM CDT SUN SEP 23 2001

CURRENT ASOS/AWOS OBSERVATIONS AND LOCAL/REGIONAL RADAR MOSIAC
IMAGERY SHOWING TS/SHWRS ASSOCIATED WITH PREFRONTAL CONVECTION
MOVING NORTHEASTWARD ACROSS W TN/N MID TN/AND THE MAJORITY
OF E KY. MSAS/HAND ANALYSES DEPICTING FRONTAL POSITION JUST
E OF MEM...WITH BEST INSTABILITY STILL CONTINUING AHEAD OF FRONT.
THIS WAS ECHOED BY 00Z KOHX SOUNDING PROFILE WHICH IS ALSO
SUPPORTIVE OF CONVECTIVE DEVELOPMENT...INDICATED BY MUTIPLE
INSTABILITY INDICES...ALTHOUGH CAPE WAS RELATIVELY WEAK. PRECIP
WATER VALUES AROUND 1.4 INCHES AND FREEZING LEVEL/WET BULB ZERO
AROUND 12KFT. UPPER LEVEL CHART ANALYSES SHOWING UPPER LEVEL FLOW
ACROSS MID STATE SWLY...WITH 60KT 300MB JET.

LAMP FORECAST GUIDANCE DEPICTING WINDS TO SHIFT NWLY LATE...BUT
NOT AS STRONG AS CURRENT SCENARIO ACROSS W TN WOULD INDICATE...WITH
WINDS GUSTING PRESENTLY TO 30 MPH. EXPECT SOME WEAKENING IN WIND
STRENGTH WITH TIME...BUT STRONGER WINDS WILL USHER IN COOLER
TEMPS THAN LAMP SUGGEST...MORE IN LINE WITH FORECASTED LOWS.

WITH THIS ALL IN MIND...WILL LEAVE ZONE PACKAGE INTACT...EXCEPT FOR
EASTERN ZONES WHERE A MENTIONING OF CONVECTION MAINLY AFTER MIDNIGHT
MORE APPROPRIATE.

.BNA...NONE.
14
JBW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 23, 8:38 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	37 min
Sep 23, 8:51 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	24 min
Sep 23, 9:51 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	24 min
Sep 23, 10:17 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury	28 min
Sep 23, 10:50 PM CDT	Severe Thunderstorm Warning	OHX	Maury, Williamson	25 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2001 Every severe thunderstorm warning in 2001

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.