Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 13, NWS Norman, OK

May 4, 2001Comanche County, Stephens County, Oklahoma

NWS Norman, OK issued this tornado warning at May 4, 2001, 5:57 PM CDT for Comanche County, Stephens 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, 5:57 PM CDT (22:57 UTC)
Expired: May 4, 2001, 6:30 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Comanche County, OK, Stephens 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, 11.0 hours before the alert went out and 98 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.

080 
WFUS54 KOUN 042300
TOROKC
OKC031-137-042330-

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

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  STEPHENS COUNTY IN SOUTHERN OKLAHOMA
  COMANCHE COUNTY IN SOUTHWEST OKLAHOMA

* UNTIL 630 PM CDT

* AT 557 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM   
CAPABLE OF PRODUCING A TORNADO NEAR PUMPKIN CENTER...MOVING   
NORTHEAST AT 30 MPH. THE MOST DANGEROUS PART OF THIS STORM WILL 
TRACK OVER NORTHWEST STEPHENS COUNTY.

THIS TORNADO IS LIKELY OBSCURED BY RAIN AND MAY NOT BE VISIBLE. 
ABANDON 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.

LAT...LON 3458 9831 3448 9808 3468 9799 3471 9819
CJS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 4:12 PM CDT	Tornado Warning	OUN	Cotton	33 min
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, 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.