Alert archive / Tennessee / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 39

February 25, 200122 counties in Kentucky; Cherokee County, North Carolina; 28 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Feb 25, 2001, 3:00 AM EST for 22 counties in Kentucky; Cherokee County, North Carolina; 28 counties in Tennessee. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Feb 25, 2001, 3:00 AM EST (08:00 UTC)
Expired: Feb 25, 2001, 7:00 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 51 counties

Bell County, KY, Boyle County, KY, Breathitt County, KY, Casey County, KY, Clay County, KY, Clinton County, KY, Estill County, KY, Garrard County, KY, Jackson County, KY, Knox County, KY, Laurel County, KY, Lee County, KY, Lincoln County, KY, Madison County, KY, McCreary County, KY, Owsley County, KY, Pulaski County, KY, Rockcastle County, KY, Russell County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Cherokee County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cumberland County, TN, Fentress County, TN, Grundy County, TN, Hamilton County, TN, Knox County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Union County, TN, Van Buren County, TN, White County, TN

The radar

The Knoxville radar (KMRX), 125 km from the middle of the area, began a volume at 07:59 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.

Warnings issued inside it

1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Feb 25, 3:22 AM EST	Severe Thunderstorm Warning	OHX	Grundy, Warren	38 min

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 8.0 hours before the alert went out and 162 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: 738 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 355 m²/s²
0-3 km storm-relative helicity: 498 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.

000 
WWUS9 KMKC 250751
SEL9  

SEL9  
MKC WW 250747
KYZ000-TNZ000-251200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 39
STORM PREDICTION CENTER NORMAN OK
247 AM CDT SUN FEB 25 2001

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   EASTERN KENTUCKY                           
   EASTERN TENNESSEE                          

EFFECTIVE THIS SUNDAY MORNING FROM 300 AM UNTIL 700 AM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 15 MILES EAST OF CHATTANOOGA TENNESSEE
TO 45 MILES WEST NORTHWEST OF JACKSON KENTUCKY.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...  CONTINUE...WW 36...WW 37...WW 38...

DISCUSSION...SEVERE SQUALL LINE CONTINUES RAPID EWD MOVEMENT AHEAD
OF VIGOROUS TROUGH.  WHILE INSTABILITY MARGINAL...WIND FIELDS ARE
VERY STRONG AND WILL CONTINUE TO SUPPORT WIND DAMAGE ASSOCIATED
WITH SQUALL LINE NEXT SEVERAL HOURS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.  MEAN STORM MOTION
VECTOR 24050.


...HALES

;374,0831 350,0840 350,0854 374,0850;

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 24, 9:00 PM EST	Severe Thunderstorm Watch	SPC	Ballard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 14 more	5 hr
Feb 25, 12:00 AM EST	Severe Thunderstorm Watch	SPC	Adair, Allen, Barren, Breckinridge, Butler, Cumberland and 17 more	4 hr
Feb 24, 10:30 PM EST	Tornado Watch	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Davidson and 21 more	5 hr

Nearby

Severe Thunderstorm Watches in Tennessee, 2001 Severe Thunderstorm Watches in Kentucky, 2001 Severe Thunderstorm Watches in North Carolina, 2001 Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.