Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 101, NWS Tulsa, OK

April 21, 2004Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 21, 2004, 4:29 PM CDT for Sequoyah County, Oklahoma. It was in force for 76 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 21, 2004, 4:29 PM CDT (21:29 UTC)
Expired
Apr 21, 2004, 5:45 PM CDT
In force
76 min
Issued by
NWS Tulsa, OK
Area
Counties, with a storm outline in the text

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 59 km from the middle of the area, began a volume at 21:31 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 watch it was issued in

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

IssuedProductOfficeLasted
Apr 21, 1:50 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.5 hours before the alert went out and 188 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, Springfield, MO at 12:00Z on 2004-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 297 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, Springfield, MO at 12:00Z on 2004-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
297 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
855 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
-7 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

926 
WUUS54 KTSA 212129
SVRTUL
OKC135-212245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
429 PM CDT WED APR 21 2004

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 545 PM CDT

* AT 429 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 2
  MILES WEST OF GORE...MOVING EAST AT 10 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...VIAN AND GORE.

HAIL TO THE SIZE OF QUARTERS CAN BE EXPECTED IN THE WARNED AREA. 
STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. BE ALERT FOR RAPIDLY
CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

LAT...LON 3540 9494 3544 9499 3548 9508 3554 9513
          3564 9512 3564 9491 3549 9482 3539 9478

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 7:06 PM CDTSevere Thunderstorm WarningTSAWashington54 min
Apr 20, 7:08 PM CDTTornado WarningTSACreek, Tulsa52 min
Apr 20, 7:10 PM CDTSevere Thunderstorm WarningTSACreek65 min
Apr 20, 7:16 PM CDTTornado WarningTSAWashington44 min
Apr 20, 7:25 PM CDTTornado WarningTSARogers50 min
Apr 20, 7:30 PM CDTSevere Thunderstorm WarningTSACraig45 min
Apr 20, 7:39 PM CDTTornado WarningTSAWagoner36 min
Apr 20, 7:41 PM CDTTornado WarningTSACreek64 min
Apr 20, 7:43 PM CDTSevere Thunderstorm WarningTSAOsage47 min
Apr 20, 7:52 PM CDTSevere Thunderstorm WarningTSARogers23 min
Apr 20, 8:03 PM CDTSevere Thunderstorm WarningTSAOkmulgee57 min
Apr 20, 8:15 PM CDTTornado WarningTSACraig, Ottawa45 min
Apr 20, 8:19 PM CDTSevere Thunderstorm WarningTSAMayes, Rogers41 min
Apr 20, 8:25 PM CDTTornado WarningTSAWagoner50 min
Apr 20, 8:28 PM CDTTornado WarningTSAOkmulgee47 min
Apr 20, 8:43 PM CDTSevere Thunderstorm WarningTSAMayes47 min
Apr 20, 8:44 PM CDTSevere Thunderstorm WarningTSACreek46 min
Apr 20, 8:51 PM CDTSevere Thunderstorm WarningTSAOttawa39 min
Apr 20, 9:02 PM CDTTornado WarningTSAMuskogee43 min
Apr 20, 9:08 PM CDTSevere Thunderstorm WarningTSAOkfuskee37 min
Apr 20, 9:13 PM CDTSevere Thunderstorm WarningTSACherokee, Wagoner47 min
Apr 20, 9:21 PM CDTTornado WarningTSAOkfuskee24 min
Apr 20, 9:29 PM CDTTornado WarningTSAOkmulgee46 min
Apr 20, 9:31 PM CDTSevere Thunderstorm WarningTSACreek44 min
Apr 20, 9:41 PM CDTSevere Thunderstorm WarningTSADelaware49 min
Apr 20, 9:44 PM CDTSevere Thunderstorm WarningTSAMuskogee46 min
Apr 20, 10:22 PM CDTSevere Thunderstorm WarningTSACherokee38 min
Apr 20, 10:24 PM CDTSevere Thunderstorm WarningTSAMcIntosh51 min
Apr 20, 10:52 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Okfuskee, Okmulgee38 min
Apr 21, 3:18 PM CDTSevere Thunderstorm WarningTSASequoyah42 min
Apr 21, 3:53 PM CDTSevere Thunderstorm WarningTSAMuskogee67 min
Apr 21, 4:41 PM CDTTornado WarningTSASequoyah64 min
Apr 21, 5:01 PM CDTSevere Thunderstorm WarningTSAPawnee74 min
Apr 21, 5:08 PM CDTSevere Thunderstorm WarningTSACherokee82 min
Apr 21, 5:24 PM CDTSevere Thunderstorm WarningTSAMuskogee51 min
Apr 21, 5:28 PM CDTTornado WarningTSASequoyah62 min
Apr 21, 5:56 PM CDTSevere Thunderstorm WarningTSACreek79 min
Apr 21, 6:12 PM CDTSevere Thunderstorm WarningTSAPawnee63 min
Apr 21, 6:16 PM CDTSevere Thunderstorm WarningTSAWagoner59 min
Apr 21, 6:19 PM CDTSevere Thunderstorm WarningTSATulsa56 min
Apr 21, 6:21 PM CDTTornado WarningTSACreek54 min
Apr 21, 6:26 PM CDTSevere Thunderstorm WarningTSARogers64 min
Apr 21, 6:30 PM CDTSevere Thunderstorm WarningTSASequoyah30 min
Apr 21, 6:33 PM CDTTornado WarningTSATulsa57 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2004Every severe thunderstorm warning in 2004

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.