Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 604, NWS Norman, OK

September 20, 2001Kingfisher County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 20, 2001, 10:39 PM CDT for Kingfisher County, Oklahoma. It was in force for 51 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: Sep 20, 2001, 10:39 PM CDT (03:39 UTC)
Expired: Sep 20, 2001, 11:30 PM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Kingfisher County, OK

What was reported inside it

Time	Report	Where	Remark
Sep 20, 11:25 PM CDT	Hail 0.88	Dover, OK

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

Lamont, OK (KLMN), launched 00:00Z, 3.7 hours before the alert went out and 84 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: 644 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 1410 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 116 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.

297 
WUUS54 KOUN 210339
SVROKC
OKC073-210430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1039 PM CDT THU SEP 20 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KINGFISHER COUNTY IN CENTRAL OKLAHOMA

* UNTIL 1130 PM CDT

* AT 1039 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM OVER
  LOYAL...MOVING NORTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE DOVER...HENNESSEY AND LOYAL

HAIL UP TO THE SIZE OF QUARTERS IS LIKELY WITH THIS SEVERE 
THUNDERSTORM.

LAT...LON 3599 9821 3586 9813 3588 9771 3616 9770
          3615 9813

33/DLF

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 Sep 20, 9:40 PM CDT, 59 minutes earlier.

Area forecast discussion, Sep 20, 9:40 PM CDT, 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
940 PM CDT THU SEP 20 2001

ONE MORE ZONE UPDATE ISSUED TO CLEAN THINGS UP A BIT BASED ON LATEST
RADAR TRENDS. REMOVED MENTION OF SEVERE BUT KEPT HEAVY RAIN
PROSPECTS ALL AREAS. ADJUSTED A FEW LOW TEMPS OVERNIGHT BASED ON
RECENT TRENDS AND REMOVED TEMPORAL WORDING FOR WINDS IN SOME OF THE
GROUPS. STILL EXPECTING MORE RAINFALL OVERNIGHT WITH APPROACH OF
SHORT WAVE.

.OUN...
OK...FLASH FLOOD WATCH AFTER MIDNIGHT FOR
OKZ 030>032-039>043-045>048-050>052
TX...NONE.

33/DLF

In the hours before

Local storm report, Sep 20, 7:50 PM CDT, 2 hours 49 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
750 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0705 PM    VERA                      TX   WIND DAMAGE. POWER POLES
09/20/01   KNOX                           DOWN. AMATEUR RADIO
                                          REPORT.

J

Local storm report, Sep 20, 8:00 PM CDT, 2 hours 39 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
800 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0748 PM    3 E BUFFALO               OK   .75 INCH HAIL
09/20/01   HARPER                         PUBLIC REPORT

0740 PM    10 E BUFFALO              OK   1.25 INCH HAIL
09/20/01   HARPER                         SPOTTER REPORT

J

Local storm report, Sep 20, 8:07 PM CDT, 2 hours 32 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
807 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0625 PM    4 NNW PLAINVIEW           OK   .75 INCH HAIL
09/20/01   WOODS                          PUBLIC REPORT

J

Local storm report, Sep 20, 8:45 PM CDT, 1 hour 54 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
845 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0815 PM    5 N WOODWARD              OK   1.00 INCH HAIL
09/20/01   WOODWARD                       SPOTTER REPORT

J

Local storm report, Sep 20, 9:09 PM CDT, 1 hour 30 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
909 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0900 PM    9 SSW WOODWARD            OK   .75 INCH HAIL
09/20/01   WOODWARD                       PUBLIC REPORT

J

Local storm report, Sep 20, 10:37 PM CDT, 2 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1037 PM CDT THU SEP 20 2001

TIME (CDT) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1035 PM    31/2 W WATONGA            OK   .88 INCH HAIL
09/20/01   BLAINE                         SHERIFFS OFFICE REPORT

J

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Harper	45 min
Sep 20, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	41 min
Sep 20, 8:13 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper	32 min
Sep 20, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	45 min
Sep 20, 10:19 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	41 min
Sep 20, 10:48 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	27 min
Sep 20, 10:54 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	51 min
Sep 20, 11:38 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher	52 min
Sep 21, 1:05 AM CDT	Severe Thunderstorm Warning	OUN	Kay	25 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.