Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 415, NWS Norman, OK

June 12, 2001Woods County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2001, 9:49 PM CDT for Woods County, Oklahoma. It was in force for 41 min. 2 reports 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: Jun 12, 2001, 9:49 PM CDT (02:49 UTC)
Expired: Jun 12, 2001, 10:30 PM CDT
In force: 41 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Woods County, OK

What was reported inside it

Time	Report	Where	Remark
Jun 12, 9:55 PM CDT	Thunderstorm Wind 52 E	Avard, OK
Jun 12, 9:55 PM CDT	Thunderstorm Wind 55 M	Alva, OK	Wind was measured by Oklahoma mesonet.

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 nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 2.8 hours before the alert went out and 152 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: 3901 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1912 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 330 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 19.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 130250
SVROKC
OKC151-130330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
949 PM CDT TUE JUN 12 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WOODS COUNTY IN NORTHWEST OKLAHOMA

* UNTIL 1030 PM CDT

* AT 946 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 3   
MILES SOUTHEAST OF AVARD...MOVING EAST NORTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE ALVA...AVARD...CAPRON AND DACOMA

WINDS TO NEAR 65 MPH ARE LIKELY WITH THIS THIS SEVERE THUNDERSTORM.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

LAT...LON 3668 9895 3656 9879 3660 9854 3695 9854
          3698 9882

CJS

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 12, 9:20 PM CDT, 29 minutes earlier.

Area forecast discussion, Jun 12, 9:20 PM CDT, 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
920 PM CDT TUE JUN 12 2001

LINE OF THUNDERSTORMS HAS CONTINUED TO PERSIST AND PUSH EAST DESPITE
DECENT CAPPING INVERSION ON THE 00Z OUN SOUNDING.  THE CONVECTION
SHOULD WEAKEN AS IT MOVES EAST INTO THE STRONGER CAP.  THERE HAS
BEEN A SLIGHT DECREASE IN MID LEVEL INTENSITIES IN THE NORTH... BUT
NOT AS MUCH AS I HAD HOPED FOR BY NOW.  HAVE UPDATED ZONES TO EXTEND
POPS FARTHER EAST IN CASE THE SHORTWAVE IS ABLE TO HELP THESE STORMS
CONTINUE FARTHER THAN EXPECTED.  THESE UPDATED ZONES ARE ALREADY OUT.

.26.

.OUN...
OK...NONE.
TX...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 12, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	62 min
Jun 12, 9:46 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	44 min
Jun 12, 10:13 PM CDT	Severe Thunderstorm Warning	OUN	Washita	47 min
Jun 12, 10:14 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	31 min
Jun 12, 10:23 PM CDT	Severe Thunderstorm Warning	OUN	Major	52 min
Jun 13, 12:22 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Tillman	38 min
Jun 13, 1:01 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	44 min
Jun 13, 1:40 AM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	65 min
Jun 13, 2:59 AM CDT	Severe Thunderstorm Warning	OUN	Garvin	46 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2001 Every severe thunderstorm warning 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.