Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 21, NWS Norman, OK

February 11, 2008Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Feb 11, 2008, 8:48 PM CST for Stephens County, Oklahoma. It was in force for 42 min. 9 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
Feb 11, 2008, 8:48 PM CST (02:48 UTC)
Expired
Feb 11, 2008, 9:30 PM CST
In force
42 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

County Stephens County, OK

The radar

The Norman radar (KTLX), 99 km from the middle of the area, began a volume at 02:50 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

TimeReportWhereRemark
Feb 11, 9:02 PM CSTHAIL 1.75Duncan, OKTHE HAIL WAS REPORTED COVERING THE GROUND NEAR HWY 7.
Feb 11, 9:05 PM CSTHAIL 1Duncan, OK
Feb 11, 9:15 PM CSTHAIL 0.88Duncan, OKTHE HAIL WAS REPORTED AT PLATO AND CHEATHAM TRAIL ROADS.
Feb 11, 9:15 PM CSTHAIL 1.75Duncan, OKTHE HAIL WAS REPORTED AT OAK AND THE HWY 7TH BYPASS.
Feb 11, 9:18 PM CSTHAIL 1.75Duncan, OKTHE HAIL WAS REPORTED IN DOWNTOWN DUNCAN.
Feb 11, 9:23 PM CSTHAIL 1.75Duncan, OKTHE HAIL WAS REPORTED ON THE NE CORNER OF DUNCAN.
Feb 11, 9:30 PM CSTHAIL 1Duncan, OK
Feb 11, 9:34 PM CSTHAIL 0.75Duncan, OKTHE HAIL WAS REPORTED AT 42ND AND FULLER.
Feb 11, 9:35 PM CSTHAIL 0.75Duncan, OKTHE HAIL WAS REPORTED AT 1ST AND MARTIN LUTHER KING.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 11, 7:57 PM CSTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.8 hours before the alert went out and 83 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2008-02-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2008-02-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 343 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
413 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
343 m²/s²
0-3 km storm-relative helicity
360 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 120249
SVROUN
OKC137-120330-
/O.NEW.KOUN.SV.W.0021.080212T0248Z-080212T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
848 PM CST MON FEB 11 2008

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN STEPHENS COUNTY IN SOUTHERN OKLAHOMA...

* UNTIL 930 PM CST

* AT 848 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTHWEST OF EMPIRE CITY...MOVING EAST 
  AT 30 MPH. HAIL UP TO THE SIZE OF QUARTERS IS LIKELY.

* LOCATIONS IN THE WARNING INCLUDE BRAY...CENTRAL HIGH...DUNCAN...
  EMPIRE CITY AND MARLOW.

TAKE SHELTER FROM THE STORM IN A STURDY BUILDING AND MOVE AWAY FROM
WINDOWS.

LAT...LON 3467 9794 3468 9756 3452 9757 3437 9814
      3462 9814
TIME...MOT...LOC 0248Z 260DEG 28KT 3450 9807

$$
1 follow-up statement
000 
WWUS54 KOUN 120307
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
906 PM CST MON FEB 11 2008

OKC137-120330-
/O.CON.KOUN.SV.W.0021.000000T0000Z-080212T0330Z/
STEPHENS OK-
906 PM CST MON FEB 11 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CST
FOR NORTHERN STEPHENS COUNTY...

AT 906 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A 
SEVERE THUNDERSTORM NEAR EMPIRE CITY...MOVING EAST AT 15 MPH. HAIL
UP TO THE SIZE OF GOLFBALLS WAS REPORTED AT 902 PM ABOUT 1 MILE WEST
OF DUNCAN.  

* LOCATIONS IN THE WARNING INCLUDE BRAY...CENTRAL HIGH...DUNCAN...
  EMPIRE CITY AND MARLOW.

HAIL UP TO GOLFBALLS IN DIAMETER IS LIKELY.

LAT...LON 3467 9794 3468 9756 3452 9757 3437 9814
      3462 9814
TIME...MOT...LOC 0306Z 255DEG 13KT 3450 9803

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 11, 8:25 PM CSTSevere Thunderstorm WarningOUNComanche, Cotton35 min
Feb 11, 8:59 PM CSTSevere Thunderstorm WarningOUNComanche, Cotton46 min
Feb 11, 9:27 PM CSTSevere Thunderstorm WarningOUNGarvin, Pontotoc48 min
Feb 11, 9:28 PM CSTSevere Thunderstorm WarningOUNStephens47 min
Feb 12, 5:59 AM CSTFire Weather WatchOUNBeckham, Custer, Dewey, Ellis, Greer, Harmon and 7 more9 hr
Feb 12, 3:28 PM CSTRed Flag WarningOUNBeckham, Comanche, Cotton, Custer, Dewey, Ellis and 9 more28 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008Every severe thunderstorm warning in 2008

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.