Alert archive / Oklahoma / Mesoscale Discussions in 2004

Mesoscale Discussion 505

April 29, 200423 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2004, 9:28 PM CDT for 23 counties in Oklahoma; 9 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2004, 9:28 PM CDT (02:28 UTC)
Expired
Apr 29, 2004, 10:30 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
All 32 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Seminole County, OK, Sequoyah County, OK, Cooke County, TX, Delta County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 118 km from the middle of the area, began a volume at 02:31 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 watches that followed

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

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.5 hours before the alert went out and 119 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 2004-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1108 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, Norman, OK at 00:00Z on 2004-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.193958Sfc1 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
1108 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
1094 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
101 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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, 8:56 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Custer, Grant, Jackson, Kiowa and 2 more64 min
Apr 29, 10:27 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Greer, Harmon, Jackson and 4 more63 min
Apr 29, 11:05 PM CDTSevere Thunderstorm WatchSPCBeckham, Caddo, Carter, Comanche, Cotton, Custer and 15 more4 hr
Apr 30, 2:16 AM CDTMesoscale DiscussionSPCBeckham, Caddo, Carter, Comanche, Cotton, Custer and 17 more59 min
Apr 30, 12:45 PM CDTTornado WatchSPCBryan, Carter, Cotton, Jefferson, Love, Marshall8 hr
Apr 30, 3:09 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Custer and 9 more2 hr
Apr 30, 4:10 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Haskell, Hughes, Latimer, LeFlore and 8 more2 hr
Apr 30, 4:40 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Carter, Cherokee, Cleveland, Coal and 23 more5 hr
Apr 30, 5:53 PM CDTMesoscale DiscussionSPCBryan, Carter, Cotton, Jefferson, Love, Marshall97 min
Apr 30, 12:01 PM CDTMesoscale DiscussionSPCArcher, Baylor, Eastland, Erath, Haskell, Hood and 9 more119 min
Apr 30, 2:40 PM CDTMesoscale DiscussionSPCCooke, Denton, Eastland, Erath, Hood, Jack and 6 more2 hr
Apr 30, 4:41 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 12 more94 min
Apr 30, 5:05 PM CDTSevere Thunderstorm WatchSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 16 more5 hr
Apr 30, 6:08 PM CDTMesoscale DiscussionSPCBailey, Borden, Cochran, Dawson, Gaines, Hockley and 6 more97 min

Nearby

Mesoscale Discussions in Oklahoma, 2004Mesoscale Discussions in Texas, 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.