Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 310, NWS Norman, OK

May 8, 2009Clay County, Texas; Jefferson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 8, 2009, 7:26 PM CDT for Clay County, Texas; Jefferson County, Oklahoma. It was in force for 49 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
May 8, 2009, 7:26 PM CDT (00:26 UTC)
Expired
May 8, 2009, 8:15 PM CDT
In force
49 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Jefferson County, OK, Clay County, TX

The radar

The Altus AFB radar (KFDR), 113 km from the middle of the area, began a volume at 00:26 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
May 8, 7:39 PM CDTHAIL 1.251 S Terral, OK
May 8, 7:39 PM CDTHAIL 1.751 S Terral, OK
May 8, 7:49 PM CDTHAIL 1.25Terral, OKHWY 81 IN TERRAL FROM COMANCHE COUNTY EM.

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
May 8, 5:08 PM CDTTornado WatchSPC7 hr
May 8, 5:52 PM CDTTornado WatchSPC11 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.4 hours before the alert went out and 135 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, Fort Worth, TX at 00:00Z on 2009-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4727 joules per kilogram.LCLLFCEL10008507005003002001001 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, Fort Worth, TX at 00:00Z on 2009-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
4727 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
993 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
3.5
Supercell composite
16.7

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOUN 090026
SVROUN
OKC067-TXC077-090115-
/O.NEW.KOUN.SV.W.0310.090509T0026Z-090509T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
726 PM CDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN CLAY COUNTY IN NORTHERN TEXAS...
  SOUTHERN JEFFERSON COUNTY IN SOUTHERN OKLAHOMA...

* UNTIL 815 PM CDT

* AT 725 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  SEVERE THUNDERSTORMS 6 MILES EAST OF RYAN...AND NEAR TERRAL MOVING 
  NORTHEAST AT 15 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF GOLFBALLS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE CORNISH...GRADY...OSCAR...
  RINGLING...RYAN...SUGDEN AND TERRAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3388 9796 3389 9797 3388 9798 3418 9798
      3420 9757 3398 9764 3398 9768 3388 9779
      3385 9785 3388 9795 3385 9798
TIME...MOT...LOC 0025Z 230DEG 11KT 3401 9785

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:28 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Murray47 min
May 8, 7:50 PM CDTSevere Thunderstorm WarningOUNCarter55 min
May 8, 7:56 PM CDTAreal Flood AdvisoryOUNMurray2 hr
May 8, 8:01 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Stephens59 min
May 8, 8:42 PM CDTSevere Thunderstorm WarningOUNCarter, Love48 min
May 8, 8:44 PM CDTFlash Flood WarningOUNCarter3 hr
May 8, 8:58 PM CDTSevere Thunderstorm WarningOUNJohnston, Love, Marshall62 min
May 8, 9:07 PM CDTSevere Thunderstorm WarningOUNJefferson38 min
May 8, 9:26 PM CDTSevere Thunderstorm WarningOUNCarter, Love64 min
May 8, 9:37 PM CDTSevere Thunderstorm WarningOUNJefferson38 min
May 8, 9:39 PM CDTSevere Thunderstorm WarningOUNCarter, Murray33 min
May 8, 10:01 PM CDTSevere Thunderstorm WarningOUNMarshall44 min
May 8, 11:07 PM CDTSevere Thunderstorm WarningOUNBryan, Johnston, Marshall38 min
May 8, 11:20 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Stephens40 min
May 8, 11:27 PM CDTSevere Thunderstorm WarningOUNLove48 min
May 8, 11:42 PM CDTSevere Thunderstorm WarningOUNLove48 min
May 9, 12:00 AM CDTSevere Thunderstorm WarningOUNCleveland, McClain31 min
May 9, 12:15 AM CDTSevere Thunderstorm WarningOUNLove, Marshall45 min
May 9, 12:44 AM CDTSevere Thunderstorm WarningOUNMcClain, Pontotoc, Pottawatomie, Seminole46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009Severe Thunderstorm Warnings in Oklahoma, 2009Every 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.