Alert archive / Oklahoma / Mesoscale Discussions in 2013

Mesoscale Discussion 342

March 30, 20139 counties in Oklahoma; 6 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2013, 4:53 PM CDT for 9 counties in Oklahoma; 6 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Mar 30, 2013, 4:53 PM CDT (21:53 UTC)
Expired: Mar 30, 2013, 6:30 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Beckham County, OK, Caddo County, OK, Custer County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Foard County, TX, Hall County, TX, Hardeman County, TX

The radar

The Altus AFB radar (KFDR), 74 km from the middle of the area, began a volume at 21:59 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, 9.9 hours before the alert went out and 197 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: 21 J/kg
Mixed-layer CIN: -317 J/kg
Mixed-layer LCL: 786 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 286 m²/s²
0-3 km storm-relative helicity: 508 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

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
Mar 29, 7:01 PM CDT	Mesoscale Discussion	SPC	Beckham, Blaine, Caddo, Canadian, Comanche, Custer and 15 more	89 min
Mar 29, 9:24 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cotton, Jefferson, Johnston and 5 more	96 min
Mar 29, 10:30 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Cotton, Jefferson, Johnston and 2 more	5 hr
Mar 30, 1:21 AM CDT	Mesoscale Discussion	SPC	Bryan	114 min
Mar 30, 10:24 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 8 more	96 min
Mar 30, 2:21 PM CDT	Mesoscale Discussion	SPC	Choctaw	84 min
Mar 30, 5:41 PM CDT	Mesoscale Discussion	SPC	Ottawa	94 min
Mar 30, 6:06 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Carter, Coal, Comanche and 14 more	7 hr
Mar 30, 2:33 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 11 more	3 hr
Mar 30, 5:15 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coleman, Comanche, Concho, Eastland and 8 more	90 min
Mar 30, 5:37 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Gregg, Harrison, Marion and 7 more	53 min

Nearby

Mesoscale Discussions in Oklahoma, 2013 Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.