Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 540

April 3, 200823 counties in Oklahoma; 26 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2008, 1:42 PM CDT for 23 counties in Oklahoma; 26 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2008, 1:42 PM CDT (18:42 UTC)
Expired
Apr 3, 2008, 3:15 PM CDT
In force
93 min
Issued by
the Storm Prediction Center
All 49 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, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole 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, Concho County, TX, Cooke County, TX, Eastland County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Montague County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 65 km from the middle of the area, began a volume at 18:45 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 12:00Z, 6.7 hours before the alert went out and 158 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 12:00Z on 2008-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 199 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 12:00Z on 2008-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 666 square meters per square second.1939587897Sfc1 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
199 J/kg
Mixed-layer CIN
-238 J/kg
Mixed-layer LCL
410 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
666 m²/s²
0-3 km storm-relative helicity
625 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

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 3, 10:47 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more58 min
Apr 3, 2:04 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Cleveland and 23 more6 hr
Apr 3, 2:39 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Haskell, Latimer and 11 more66 min
Apr 3, 3:50 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Creek, Delaware, Haskell and 15 more5 hr
Apr 3, 5:32 PM CDTMesoscale DiscussionSPCBryan, Choctaw, McCurtain, Marshall58 min
Apr 3, 5:54 PM CDTTornado WatchSPCMcCurtain3 hr
Apr 3, 6:12 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Cleveland and 34 more2 hr
Apr 3, 3:28 PM CDTMesoscale DiscussionSPCCoke, Crockett, Glasscock, Irion, Reagan, Sterling and 3 more62 min
Apr 3, 4:40 PM CDTTornado WatchSPCCrockett, Edwards, Kinney, Schleicher, Sutton, Terrell and 1 more3 hr

Nearby

Mesoscale Discussions in Texas, 2008Mesoscale Discussions in Oklahoma, 2008Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.