Alert archive / Tennessee / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 221, NWS Nashville, TN

August 18, 2002DeKalb County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 18, 2002, 3:29 PM CDT for DeKalb County, Tennessee. It was in force for 31 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: Aug 18, 2002, 3:29 PM CDT (20:29 UTC)
Expired: Aug 18, 2002, 4:00 PM CDT
In force: 31 min
Issued by: NWS Nashville, TN
Area: Whole counties

County DeKalb County, TN

The radar

The Nashville radar (KOHX), 72 km from the middle of the area, began a volume at 20:31 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.5 hours before the alert went out and 71 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: 2055 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 662 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

097 
WUUS54 KOHX 182029
SVRBNA
TNC041-182100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
328 PM CDT SUN AUG 18 2002

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DE KALB COUNTY IN TENNESSEE

* UNTIL 400 PM CDT

* AT 325 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHEAST OF DOWELLTOWN...OR 10 MILES
  NORTHWEST OF SMITHVILLE...MOVING EAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CENTER HILL LAKE THROUGH 400 PM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING.

$$

13

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 Aug 18, 2:35 PM CDT, 54 minutes earlier.

Area forecast discussion, Aug 18, 2:35 PM CDT, 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
235 PM CDT SUN AUG 18 2002

CURRENT...MCS OVER MO THIS MORNING HAS TOUCHED OFF SOME CONVECTION
W/ OUTFLOW BOUNDARIES THIS AFTERNOON OVER NW COUNTIES WHILE OTHER
WEAK VORT LOBE HAS HELPED FOR OUR SE COUNTIES.  NOT MUCH IN BETWEEN.
TEMPS HAVE RISEN INTO UPPER 80S TO NEAR 90.

FORECAST...AFOREMENTIONED UPPER AIR FEATURES WILL CONTINUE TO PUSH
SE THIS EVE AND TONITE.  PROABLY WILL BE SOME EVE ACTIVITY AND
POSSIBLY ISOLATED ACTIVTY FAR SE LATE TONITE...BUT WILL NOT MENTION
LATTER.  AS FOR MON...ONLY ETA SHOWS AN UPPER LEVEL FEATURE TO
ASSIST...AND THAT AFFECTS MAINLY SE 1/2.  WILL CONTINUE POPS
TOMORROW BUT LOWER A LITTLE.  DONT SEE A FROPA IN NEAR FUTURE...AM
BUYING ETA SOLUTION...SO ONLY ISOLATED STORMS ON TUE AS RIDGE
BUILDS.

AS FOR TEMPS...NEAR PERSISTENCE NEXT FEW DAYS.  DONT SEE BIG REASON
FOR COOL-OFF FOR BNA ON TUE.

BNA BB 72/92/72/92 2322
CSV BB 65/85/65/85 2422

.BNA...NONE.

MAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 4:09 PM CDT	Severe Thunderstorm Warning	OHX	Overton	51 min
Aug 18, 4:49 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb	41 min
Aug 18, 4:51 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	39 min
Aug 18, 4:57 PM CDT	Severe Thunderstorm Warning	OHX	Cannon	48 min
Aug 18, 5:45 PM CDT	Severe Thunderstorm Warning	OHX	Coffee	35 min
Aug 18, 5:47 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	43 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2002 Every severe thunderstorm warning in 2002

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.