Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 607, NWS Norman, OK

September 20, 2001Canadian County, Kingfisher County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 20, 2001, 11:38 PM CDT for Canadian County, Kingfisher County, Oklahoma. It was in force for 52 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: Sep 20, 2001, 11:38 PM CDT (04:38 UTC)
Expired: Sep 21, 2001, 12:30 AM CDT
In force: 52 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Canadian County, OK, Kingfisher County, OK

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 04:39 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.6 hours before the alert went out and 81 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: 703 J/kg
Mixed-layer CIN: -340 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 289 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

223 
WUUS54 KOUN 210440
SVROKC
OKC017-073-210530-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1138 PM CDT THU SEP 20 2001

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

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

* UNTIL 1230 AM CDT

* AT 1138 PM CDT...DOPPLER RADAR DETECTED A SEVERE THUNDERSTORM 8   
MILES EAST OF KINGFISHER...MOVING SOUTH AT 15 MPH. QUARTER SIZE HAIL 
WAS REPORTED IN DOVER AT 1125 PM.

* LOCATIONS IN THE WARNING INCLUDE CALUMET...CONCHO...EL RENO...
  KINGFISHER...OKARCHE AND PIEDMONT

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

LAT...LON 3580 9822 3546 9827 3561 9770 3602 9772

33/DLF

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, 10:39 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	51 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 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.