Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 581

April 7, 200842 counties in Oklahoma; 4 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2008, 6:52 PM CDT for 42 counties in Oklahoma; 4 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2008, 6:52 PM CDT (23:52 UTC)
Expired
Apr 7, 2008, 8:45 PM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 46 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Tulsa County, OK, Wagoner County, OK, Washita County, OK, Archer County, TX, Clay County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 49 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 91 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 2008-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 joules per kilogram.LCLLFCEL10008507005003002001001 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 2008-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
10 J/kg
Mixed-layer CIN
-463 J/kg
Mixed-layer LCL
1302 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
106 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 7, 2:05 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Grady, Kiowa, Stephens and 2 more85 min
Apr 7, 3:02 PM CDTTornado Watch PDSSPCBlaine, Caddo, Canadian, Carter, Cleveland, Comanche and 22 more7 hr
Apr 7, 4:52 PM CDTMesoscale DiscussionSPCCaddo, Comanche, Cotton, Grady, Jackson, Kiowa and 3 more83 min
Apr 7, 2:46 PM CDTMesoscale DiscussionSPCCallahan, Coleman, Runnels, Shackelford, Stephens, Taylor and 2 more89 min

Nearby

Mesoscale Discussions in Oklahoma, 2008Mesoscale Discussions in Texas, 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.