Alert archive / Oklahoma / Tornado Warnings in 2001

Tornado Warning 42, NWS Norman, OK

May 27, 2001Alfalfa County, Oklahoma

NWS Norman, OK issued this tornado warning at May 27, 2001, 6:55 PM CDT for Alfalfa County, Oklahoma. It was in force for 35 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 27, 2001, 6:55 PM CDT (23:55 UTC)
Expired: May 27, 2001, 7:30 PM CDT
In force: 35 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Alfalfa 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 27, 1:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 27, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 11.9 hours before the alert went out and 80 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: 776 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 1272 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KOUN 272355
TOROKC
OKC003-280030-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
655 PM CDT SUN MAY 27 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  ALFALFA COUNTY IN NORTHWEST OKLAHOMA

* UNTIL 730 PM CDT

* AT 655 PM CDT...STORM SPOTTERS REPORTED A TORNADO 3 MILES NORTHWEST
  OF CHEROKEE...MOVING EAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BYRON...DRIFTWOOD AND INGERSOLL

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 3688 9854 3676 9846 3673 9808 3694 9807
ANDRA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 2:35 AM CDT	Severe Thunderstorm Warning	OUN	Stephens	40 min
May 27, 3:20 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Stephens	40 min
May 27, 2:36 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	54 min
May 27, 5:59 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	46 min
May 27, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	51 min
May 27, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	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; the sounding from the Mesonet's radiosonde archive.