Alert archive / Oklahoma / Mesoscale Discussions in 2011

Mesoscale Discussion 1332

June 20, 201123 counties in Oklahoma; 9 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 7:56 PM CDT for 23 counties in Oklahoma; 9 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2011, 7:56 PM CDT (00:56 UTC)
Expired: Jun 20, 2011, 9:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 32 counties

Carter County, OK, Cleveland County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Washington County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Jack County, TX, Montague County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Young County, TX

The radar

The Altus AFB radar (KFDR), 98 km from the middle of the area, began a volume at 00:58 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.

Severe Thunderstorm Watch 529Jun 20, 9:50 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.9 hours before the alert went out and 94 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: 1985 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 2113 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 276 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 17.0

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.

Issued	Product	Office	Counties	Lasted
Jun 20, 9:46 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 42 more	9 hr
Jun 21, 3:15 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Choctaw, Coal, Haskell and 8 more	60 min
Jun 21, 6:21 PM CDT	Mesoscale Discussion	SPC	Choctaw, LeFlore, McCurtain, Pushmataha	54 min
Jun 21, 6:43 PM CDT	Severe Thunderstorm Watch	SPC	Choctaw, LeFlore, McCurtain, Pushmataha	6 hr
Jun 21, 3:43 PM CDT	Mesoscale Discussion	SPC	Anderson, Bosque, Camp, Cass, Cherokee, Coryell and 32 more	62 min
Jun 21, 4:58 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Bell, Bosque, Brewster, Brown and 84 more	10 hr
Jun 21, 6:59 PM CDT	Mesoscale Discussion	SPC	Angelina, Cherokee, Hardin, Houston, Jasper, Liberty and 10 more	61 min

Nearby

Mesoscale Discussions in Oklahoma, 2011 Mesoscale Discussions in Texas, 2011 Every mesoscale discussion in 2011

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.