Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 2, NWS Norman, OK

April 6, 2001Dewey County, Ellis County, Woodward County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 6, 2001, 7:31 PM CDT for Dewey County, Ellis County, Woodward County, Oklahoma. It was in force for 29 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 6, 2001, 7:31 PM CDT (00:31 UTC)
Expired: Apr 6, 2001, 8:00 PM CDT
In force: 29 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Dewey County, OK, Ellis County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 123 km from the middle of the area, began a volume at 00:31 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 6, 8:00 PM CDT	Thunderstorm Wind	Seiling, OK	The tops of several trees were blown off.

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 6, 4:00 PM CDT	Tornado Watch	SPC	5 hr
Apr 6, 7:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 0.5 hours before the alert went out and 170 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: 495 J/kg
Mixed-layer CIN: -394 J/kg
Mixed-layer LCL: 1173 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 287 m²/s²
0-3 km storm-relative helicity: 493 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 070032
TOROKC
OKC043-045-153-070100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
731 PM CDT FRI APR 6 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  NORHTERN DEWEY COUNTY IN NORTHWEST OKLAHOMA
  EASTERN ELLIS COUNTY IN NORTHWEST OKLAHOMA
  WOODWARD COUNTY IN NORTHWEST OKLAHOMA

* UNTIL 800 PM CDT

* AT 731 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO 19 MILES SOUTHWEST OF VICI...MOVING
  NORTHEAST AT 70 MPH.

* LOCATIONS IN THE WARNING INCLUDE CESTOS...MUTUAL...SHARON AND VICI

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.

THIS TORNADO IS LIKELY OBSCURED BY RAIN AND MAY NOT BE VISIBLE.
ABANDON MOBILE HOMES AND VEHICLES. IF POSSSIBLE... 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 3597 9964 3609 9897 3633 9897 3638 9923

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 7:07 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	23 min
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Major, Roger Mills, Woodward	52 min
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	52 min
Apr 6, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	52 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woods, Woodward	45 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	45 min
Apr 6, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	45 min
Apr 6, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	45 min
Apr 6, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	45 min
Apr 6, 9:28 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	47 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.