Alert archive / Oklahoma / Mesoscale Discussions in 2007

Mesoscale Discussion 1457

July 12, 2007Crawford County, Sebastian County, Arkansas; 13 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 12, 2007, 10:39 AM CDT for Crawford County, Sebastian County, Arkansas; 13 counties in Oklahoma. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jul 12, 2007, 10:39 AM CDT (15:39 UTC)
Expired: Jul 12, 2007, 11:45 AM CDT
In force: 66 min
Issued by: the Storm Prediction Center

Counties Crawford County, AR, Sebastian County, AR, Atoka County, OK, Carter County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Norman radar (KTLX), 130 km from the middle of the area, began a volume at 15:42 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, 3.7 hours before the alert went out and 135 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: 2131 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 912 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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
Jul 12, 2:07 PM CDT	Mesoscale Discussion	SPC	Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 19 more	53 min
Jul 11, 10:17 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	88 min
Jul 12, 5:34 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Blaine, Caddo, Canadian, Cleveland, Custer and 15 more	2 hr
Jul 12, 5:46 AM CDT	Severe Thunderstorm Watch	SPC	Blaine, Caddo, Canadian, Cleveland, Creek, Custer and 23 more	5 hr
Jul 12, 7:47 AM CDT	Mesoscale Discussion	SPC	Blaine, Caddo, Canadian, Cleveland, Creek, Custer and 21 more	118 min
Jul 12, 3:41 PM CDT	Mesoscale Discussion	SPC	Beaver, Beckham, Ellis, Greer, Harmon, Harper and 4 more	2 hr
Jul 12, 5:54 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Ellis, Harper, Texas, Woods and 1 more	7 hr

Nearby

Mesoscale Discussions in Oklahoma, 2007 Mesoscale Discussions in Arkansas, 2007 Every mesoscale discussion in 2007

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.