Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 927

May 30, 200711 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2007, 7:42 AM CDT for 11 counties in Oklahoma; 17 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: May 30, 2007, 7:42 AM CDT (12:42 UTC)
Expired: May 30, 2007, 9:15 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 28 counties

Bryan County, OK, Carter County, OK, Cotton County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Montague County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 136 km from the middle of the area, began a volume at 12:45 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 310May 30, 8:55 AM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 0.7 hours before the alert went out and 107 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: 1294 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.5

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 29, 9:02 PM CDT	Mesoscale Discussion	SPC	Beaver, Harper, Texas	118 min
May 30, 1:52 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 5 more	83 min
May 30, 4:11 AM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Comanche, Cotton, Grady, Greer and 7 more	94 min
May 30, 4:50 AM CDT	Severe Thunderstorm Watch	SPC	Bryan, Carter, Comanche, Cotton, Garvin, Grady and 9 more	6 hr
May 29, 7:53 PM CDT	Mesoscale Discussion	SPC	Bell, Brown, Burnet, Coleman, Coryell, Lampasas and 5 more	2 hr
May 30, 8:59 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Austin, Bell, Bosque, Bowie and 63 more	5 hr
May 30, 11:07 AM CDT	Mesoscale Discussion	SPC	Anderson, Angelina, Austin, Brazos, Burleson, Camp and 45 more	83 min
May 30, 1:23 PM CDT	Mesoscale Discussion	SPC	Angelina, Chambers, Hardin, Jasper, Jefferson, Liberty and 10 more	97 min
May 30, 6:13 PM CDT	Mesoscale Discussion	SPC	Bandera, Brown, Callahan, Coleman, Comanche, Concho and 18 more	92 min

Nearby

Mesoscale Discussions in Texas, 2007 Mesoscale Discussions in Oklahoma, 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.