Alert archive / Oklahoma / Mesoscale Discussions in 2008

Mesoscale Discussion 715

April 24, 200820 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2008, 4:15 PM CDT for 20 counties in Oklahoma; 8 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 24, 2008, 4:15 PM CDT (21:15 UTC)
Expired: Apr 24, 2008, 6:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 28 counties

Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Jefferson County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, McClain County, OK, Oklahoma County, OK, Stephens County, OK, Woods County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Jack County, TX, Montague County, TX, Throckmorton County, TX, Wichita County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 42 km from the middle of the area, began a volume at 21:14 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 12:00Z, 9.3 hours before the alert went out and 134 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: 405 J/kg
Mixed-layer CIN: -312 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 391 m²/s²
0-3 km storm-relative helicity: 545 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 14.6

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 24, 7:52 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Haskell, Latimer and 12 more	53 min
Apr 23, 10:02 PM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Collin, Coryell, Dallas, Delta and 24 more	88 min
Apr 24, 2:49 PM CDT	Mesoscale Discussion	SPC	Brown, Coleman, Comanche, Concho, Edwards, Gillespie and 14 more	2 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.