Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 720

May 5, 200918 counties in Oklahoma; 14 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 5, 2009, 11:03 PM CDT for 18 counties in Oklahoma; 14 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 5, 2009, 11:03 PM CDT (04:03 UTC)
Expired: May 6, 2009, 1:00 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

All 32 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Cotton County, OK, Garvin County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Stephens County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Jack County, TX, Lamar County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 143 km from the middle of the area, began a volume at 04:03 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 249May 5, 11:30 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 4.1 hours before the alert went out and 114 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: 2348 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 367 m²/s²
Significant tornado parameter: 5.0
Supercell composite: 16.1

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
May 5, 10:27 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	8 hr
May 5, 11:26 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 13 more	6 hr
May 6, 12:54 AM CDT	Tornado Watch	SPC	McCurtain	5 hr
May 6, 2:00 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Caddo, Carter, Choctaw, Coal and 18 more	2 hr
May 6, 3:05 AM CDT	Mesoscale Discussion	SPC	McCurtain	115 min
May 6, 5:08 AM CDT	Mesoscale Discussion	SPC	Bryan, Carter, Choctaw, Cotton, Jefferson, Johnston and 2 more	97 min
May 6, 5:29 AM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Cotton, Jefferson and 5 more	8 hr
May 5, 7:19 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 19 more	86 min
May 5, 9:14 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Bosque, Brown, Callahan, Coleman and 24 more	31 min
May 6, 6:58 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more	3 hr

Nearby

Mesoscale Discussions in Oklahoma, 2009 Mesoscale Discussions in Texas, 2009 Every mesoscale discussion in 2009

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.