Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 7, NWS Norman, OK

April 11, 2001Love County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 11, 2001, 3:58 AM CDT for Love County, Oklahoma. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 11, 2001, 3:58 AM CDT (08:58 UTC)
Expired: Apr 11, 2001, 4:30 AM CDT
In force: 32 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Love County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 151 km from the middle of the area, began a volume at 09:02 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
Apr 11, 3:58 AM CDT	Tornado F1	Thackerville, OK	This tornado developed in Cooke County Texas at approximately 0257 CST and tracked northeastward for approximately 1 mile before crossing the Red River into Love County in Oklahoma (see National Weather Service Forth Worth, Texas stormdata for more information

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
Apr 11, 3:15 AM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 9.0 hours before the alert went out and 123 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: 1205 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOUN 110857
TOROKC
OKC085-110930-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
358 AM CDT WED APR 11 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN LOVE COUNTY IN SOUTHERN OKLAHOMA

* UNTIL 430 AM CDT

* AT 358 AM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 5 MILES SOUTHWEST OF THACKERVILLE...
  MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IN THE WARNING INCLUDE MARIETTA AND THACKERVILLE

TAKE COVER NOW. LEAVE MOBILE HOMES AND VEHICLES. IF POSSIBLE...MOVE
TO A BASEMENT OR STORM SHELTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR
HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS AND OUTSIDE
WALLS.

TORNADOES ARE ESPECIALLY DANGEROUS AT NIGHT BECAUSE THEY ARE HARD TO
SEE. TAKE COVER NOW. IF A BASEMENT IS NOT AVAILABLE...MOVE TO AN
INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. LEAVE MOBILE HOMES AND
VEHICLES FOR REINFORCED SHELTER. STAY AWAY FROM WINDOWS.

LAT...LON 3385 9721 3371 9714 3397 9694 3406 9696
          3408 9704

...SPEG.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 1:22 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	38 min
Apr 11, 1:44 AM CDT	Tornado Warning	OUN	Garvin, McClain	31 min
Apr 11, 1:56 AM CDT	Tornado Warning	OUN	Pottawatomie	34 min
Apr 11, 2:17 AM CDT	Tornado Warning	OUN	Pottawatomie	28 min
Apr 11, 2:56 AM CDT	Tornado Warning	OUN	Pottawatomie, Seminole	34 min
Apr 11, 4:41 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Pontotoc	34 min
Apr 11, 5:05 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	25 min
Apr 11, 5:12 AM CDT	Severe Thunderstorm Warning	OUN	Hughes	33 min
Apr 11, 5:30 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	45 min

Nearby

Tornado Warnings in Oklahoma, 2001 Every tornado warning in 2001 Tornadoes 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.