Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 498

April 29, 200419 counties in Oklahoma; 24 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2004, 5:10 PM CDT for 19 counties in Oklahoma; 24 counties in Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2004, 5:10 PM CDT (22:10 UTC)
Expired
Apr 29, 2004, 6:45 PM CDT
In force
95 min
Issued by
the Storm Prediction Center
All 43 counties

Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Kingfisher County, OK, Logan County, OK, Love County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Clay County, TX, Coke County, TX, Coleman County, TX, Cooke County, TX, Eastland County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Knox County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 46 km from the middle of the area, began a volume at 22:13 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 10.2 hours before the alert went out and 58 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 Sill, OK at 12:00Z on 2004-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Sill, OK at 12:00Z on 2004-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.1939Sfc1 km3 km6 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
695 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
324 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 1:49 PM CDTMesoscale DiscussionSPCBeckham, Greer, Harmon, Jackson, Tillman116 min
Apr 29, 3:05 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Grant and 9 more7 hr
Apr 29, 5:35 PM CDTSevere Thunderstorm WatchSPCCaddo, Canadian, Cleveland, Comanche, Cotton, Grady and 10 more5 hr
Apr 29, 6:35 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Custer, Dewey, Grant and 9 more85 min
Apr 28, 7:07 PM CDTMesoscale DiscussionSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more83 min
Apr 28, 7:25 PM CDTSevere Thunderstorm WatchSPCBandera, Brooks, Crockett, Dimmit, Duval, Edwards and 17 more6 hr
Apr 28, 9:56 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 12 more94 min
Apr 29, 4:12 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Colorado, DeWitt and 18 more3 hr
Apr 29, 1:10 PM CDTTornado WatchSPCShelby6 hr
Apr 29, 3:58 PM CDTMesoscale DiscussionSPCBorden, Coke, Crockett, Fisher, Glasscock, Howard and 15 more2 hr

Nearby

Mesoscale Discussions in Texas, 2004Mesoscale Discussions in Oklahoma, 2004Every mesoscale discussion 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.