Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 903

May 13, 20089 counties in Oklahoma; 16 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 13, 2008, 1:25 PM CDT for 9 counties in Oklahoma; 16 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 13, 2008, 1:25 PM CDT (18:25 UTC)
Expired: May 13, 2008, 4:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 25 counties

Carter County, OK, Cleveland County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Love County, OK, McClain County, OK, Murray County, OK, Stephens County, OK, Archer County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Eastland County, TX, Erath County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Shackelford County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 114 km from the middle of the area, began a volume at 18:27 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.

Tornado Watch 311May 13, 2:05 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 6.4 hours before the alert went out and 231 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: 847 J/kg
Mixed-layer CIN: -518 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 636 m²/s²
0-3 km storm-relative helicity: 580 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 13, 6:26 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 41 more	94 min
May 13, 2:03 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 28 more	9 hr
May 13, 4:51 PM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Osage, Ottawa, Rogers, Tulsa and 1 more	84 min
May 13, 5:09 PM CDT	Tornado Watch	SPC	Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more	5 hr
May 13, 5:50 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 26 more	115 min
May 13, 9:37 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Bell, Bosque, Bowie, Brazos and 61 more	53 min
May 13, 5:29 PM CDT	Mesoscale Discussion	SPC	Bandera, Edwards, Kerr, Kimble, Kinney, Mason and 9 more	91 min
May 13, 6:06 PM CDT	Severe Thunderstorm Watch	SPC	Bandera, Blanco, Burnet, Dimmit, Edwards, Gillespie and 10 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2008 Mesoscale Discussions in Oklahoma, 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.