Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 695

April 23, 200820 counties in Oklahoma; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2008, 2:01 AM CDT for 20 counties in Oklahoma; 5 counties in Texas. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Apr 23, 2008, 2:01 AM CDT (07:01 UTC)
Expired: Apr 23, 2008, 3:30 AM CDT
In force: 89 min
Issued by: the Storm Prediction Center

All 25 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, McClain County, OK, Oklahoma County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 71 km from the middle of the area, began a volume at 07:02 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 7.0 hours before the alert went out and 104 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1939 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

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.

Issued	Product	Office	Counties	Lasted
Apr 23, 7:31 AM CDT	Mesoscale Discussion	SPC	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 5 more	59 min
Apr 23, 9:32 AM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Comanche and 21 more	6 hr
Apr 23, 11:42 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 16 more	2 hr
Apr 23, 3:37 PM CDT	Mesoscale Discussion	SPC	Adair, Alfalfa, Beaver, Beckham, Blaine, Caddo and 43 more	53 min
Apr 23, 3:52 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	4 hr
Apr 23, 9:59 AM CDT	Mesoscale Discussion	SPC	Borden, Callahan, Coke, Dawson, Fisher, Garza and 18 more	61 min
Apr 23, 10:07 AM CDT	Tornado Watch	SPC	Andrews, Borden, Coke, Concho, Crane, Dawson and 25 more	6 hr
Apr 23, 1:35 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Coke, Crane, Dawson, Ector and 20 more	85 min
Apr 23, 2:28 PM CDT	Mesoscale Discussion	SPC	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 18 more	3 hr
Apr 23, 3:16 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 34 more	59 min
Apr 23, 3:25 PM CDT	Tornado Watch	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 44 more	8 hr
Apr 23, 5:43 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Brown, Callahan, Coke, Coleman and 44 more	92 min
Apr 23, 6:20 PM CDT	Tornado Watch	SPC	Anderson, Bosque, Collin, Coryell, Dallas, Delta and 24 more	7 hr

Nearby

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