Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 9, NWS Norman, OK

May 4, 2001Cotton County, Oklahoma

NWS Norman, OK issued this tornado warning at May 4, 2001, 4:12 PM CDT for Cotton County, Oklahoma. It was in force for 33 min. No storm report in the archive falls 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.

The facts

Issued: May 4, 2001, 4:12 PM CDT (21:12 UTC)
Expired: May 4, 2001, 4:45 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cotton County, OK

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 4, 2:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.2 hours before the alert went out and 144 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: 225 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 928 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: -10 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 
WFUS54 KOUN 042113
TOROKC

OKC033-042145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
412 PM CDT FRI MAY 4 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  COTTON COUNTY IN SOUTHWEST OKLAHOMA

* UNTIL 445 PM CDT

* AT 412 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM   
CAPABLE OF PRODUCING A TORNADO 15 MILES WEST OF WALTERS... MOVING  
NORTHEAST AT 35 MPH. WIND DAMAGE WAS REPORTED IN THE GRANDFIELD AREA.

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.

LAT...LON 3435 9867 3421 9858 3447 9832 3441 9863
CJS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 4:45 PM CDT	Tornado Warning	OUN	Cotton	30 min
May 4, 5:12 PM CDT	Tornado Warning	OUN	Cotton	33 min
May 4, 5:30 PM CDT	Tornado Warning	OUN	Comanche	30 min
May 4, 5:57 PM CDT	Tornado Warning	OUN	Comanche, Stephens	33 min
May 4, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Grady	38 min
May 4, 6:24 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	51 min
May 4, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Grady	47 min
May 4, 6:49 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	26 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; the sounding from the Mesonet's radiosonde archive.