Alert archive / Tennessee / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 250, NWS Nashville, TN

August 26, 2002Grundy County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 26, 2002, 4:51 PM CDT for Grundy County, Tennessee. It was in force for 24 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: Aug 26, 2002, 4:51 PM CDT (21:51 UTC)
Expired: Aug 26, 2002, 5:15 PM CDT
In force: 24 min
Issued by: NWS Nashville, TN
Area: Whole counties

County Grundy County, TN

The radar

The Northeast Alabama radar (KHTX), 61 km from the middle of the area, began a volume at 21:53 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
Aug 26, 4:55 PM CDT	Hail 1.75	Tracy City, TN	Golf ball size hail was reported.
Aug 26, 4:55 PM CDT	Thunderstorm Wind 50 E	Tracy City, TN	Law enforcement reported numerous trees were 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.9 hours before the alert went out and 114 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: 1111 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 8 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.

967 
WUUS54 KOHX 262151
SVRBNA
TNC061-262215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
450 PM CDT MON AUG 26 2002

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GRUNDY COUNTY IN TENNESSEE

* UNTIL 515 PM CDT

* AT 442 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR TRACY CITY...OR 6 MILES NORTHEAST OF
  MONTEAGLE...MOVING SOUTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  IN EXTREME SOUTHEASTERN GRUNDY COUNTY BY 500 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
LAT...LON 3539 8575 3523 8586 3502 8548 3524 8533

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 26, 2:27 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Aug 26, 2:27 PM CDT, 2 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
227 PM CDT MON AUG 26 2002

UPPER LEVEL CLOSED LOW WILL PERSIST ACROSS THE MID STATE THROUGH AT
LEAST THE FIRST HALF OF THE WORK WEEK. SIGNIFICANT LOW LEVEL
FEATURES ARE NOT NOTED UNTIL THURSDAY WHEN A WESTWARD MOVING
INVERTED TROUGH MOVES ACROSS THE AREA.

FOR TUESDAY AND WEDNESDAY...SCATTERED ACTIVITY WILL BE POSSIBLE WITH
THE BEST CHANCES FOR THUNDERSTORMS OCCURRING OVER THE PLATEAU. THE
ACTIVITY SHOULD BE MOST NUMEROUS DURING THE AFTERNOON AND EVENING
HOURS. HOWEVER...GIVEN THE GENERAL UPPER LEVEL INFLUENCE...WILL
INCLUDE SLIGHT POPS THROUGH THE NIGHTTIME PERIODS.

ON THURSDAY...WILL CONTINUE WITH A 30 PERCENT CHANCE OF
THUNDERSTORMS AREA WIDE AS SOME ADDITIONAL FORCING IS POSSIBLE.

UPPER LOW WILL WEAKEN CONSIDERABLY BY THE WEEKEND AS A BERMUDA HIGH
BRINGS A MOIST SOUTHERLY FLOW ACROSS THE AREA. WILL THEREFORE
CONTINUE WITH A CHANCE OF THUNDERSTORMS ON INTO THE EXTENDED PERIOD.

NEAR NORMAL TEMPERATURES ARE EXPECTED THROUGH THE PERIOD AS 850 MB
TEMPERATURES HOVER AROUND 16C. WILL STRAY LITTLE FROM MOS VALUES FOR
TEMPS.

BNA BB 68/85/68/85 2312
CSV BB 61/79/61/77 2423

21

.BNA...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 2:30 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	30 min
Aug 26, 3:39 PM CDT	Severe Thunderstorm Warning	OHX	Lincoln	36 min
Aug 26, 4:04 PM CDT	Severe Thunderstorm Warning	OHX	Franklin	26 min
Aug 26, 4:13 PM CDT	Severe Thunderstorm Warning	OHX	Lincoln	47 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.