Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 708, NWS Norman, OK

August 26, 2009Caddo County, Grady County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 26, 2009, 11:30 PM CDT for Caddo County, Grady County, Oklahoma. It was in force for 60 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 26, 2009, 11:30 PM CDT (04:30 UTC)
Expired: Aug 27, 2009, 12:30 AM CDT
In force: 60 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Caddo County, OK, Grady County, OK

The radar

The Norman radar (KTLX), 93 km from the middle of the area, began a volume at 04:33 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
Aug 26, 11:30 PM CDT	TSTM WND GST 61	4 Nnw Fort Cobb, OK
Aug 26, 11:35 PM CDT	TSTM WND GST 76	4 Nnw Fort Cobb, OK
Aug 26, 11:50 PM CDT	HAIL 1	5 W Anadarko, OK	HWY 9 AND 2620 VIA CADDO NATION EM

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.5 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: 2283 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1935 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 68 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 
WUUS54 KOUN 270430
SVROUN
OKC015-051-270530-
/O.NEW.KOUN.SV.W.0708.090827T0430Z-090827T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1130 PM CDT WED AUG 26 2009

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN GRADY COUNTY IN CENTRAL OKLAHOMA...
  CADDO COUNTY IN SOUTHWEST OKLAHOMA...

* UNTIL 1230 AM CDT

* AT 1130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHWEST
  OF GRACEMONT TO FORT COBB TO 6 MILES NORTHWEST OF BOONE...MOVING
  EAST AT 25 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 65 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...

* LOCATIONS IN THE WARNING INCLUDE ALBERT...ANADARKO...APACHE...
  BINGER...BOONE...CARNEGIE...CEMENT...COGAR...FORT COBB RESERVOIR...
  FORT COBB...GRACEMONT...LAKE CHICKASHA...LAVERTY...NORGE...STECKER
  AND VERDEN.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 70 AND 76.

LAT...LON 3536 9828 3537 9800 3521 9797 3492 9798
      3487 9861 3506 9860 3529 9860
TIME...MOT...LOC 0430Z 251DEG 23KT 3522 9833 3507 9841
          3497 9852

$$


30

1 follow-up statement

000 
WWUS54 KOUN 270443
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1143 PM CDT WED AUG 26 2009

OKC015-051-270530-
/O.CON.KOUN.SV.W.0708.000000T0000Z-090827T0530Z/
CADDO OK-GRADY OK-
1143 PM CDT WED AUG 26 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR NORTHWESTERN GRADY AND CADDO COUNTIES...

AT 1142 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 3 MILES NORTH OF
GRACEMONT TO 5 MILES EAST OF FORT COBB TO 6 MILES NORTH OF 
BOONE...MOVING EAST AT 25 MPH. A WIND GUST TO 76 MPH WAS REPORTED AT 
THE FORT COBB MESONET SITE AT 1135 PM.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
DESTRUCTIVE WIND GUSTS TO 80 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...

* LOCATIONS IN THE WARNING INCLUDE ALBERT...ANADARKO...APACHE...
  BINGER...BOONE...CARNEGIE...CEMENT...COGAR...FORT COBB RESERVOIR...
  FORT COBB...GRACEMONT...LAKE CHICKASHA...LAVERTY...NORGE...STECKER
  AND VERDEN.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 70 AND 77.

LAT...LON 3536 9828 3537 9800 3521 9797 3492 9798
      3487 9861 3506 9860 3529 9860
TIME...MOT...LOC 0442Z 251DEG 23KT 3524 9824 3509 9832
          3499 9843

$$


30

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 7:08 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	67 min
Aug 26, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	27 min
Aug 26, 8:05 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Garfield, Grant	3 hr
Aug 26, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	50 min
Aug 26, 8:21 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Major	39 min
Aug 26, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Lincoln, Logan, Noble, Payne	55 min
Aug 26, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	51 min
Aug 26, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	49 min
Aug 26, 9:51 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	54 min
Aug 26, 10:19 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma	41 min
Aug 26, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie	36 min
Aug 26, 10:50 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	40 min
Aug 26, 11:04 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie	56 min
Aug 26, 11:20 PM CDT	Areal Flood Advisory	OUN	Caddo	3 hr
Aug 26, 11:58 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	62 min
Aug 27, 12:14 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, Stephens	46 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.