Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 714

May 5, 200920 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 5, 2009, 5:13 PM CDT for 20 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: May 5, 2009, 5:13 PM CDT (22:13 UTC)
Expired: May 5, 2009, 6:15 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Bosque County, TX, Brown County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Johnson County, TX, Mills County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX

The radar

The Dyess AFB radar (KDYX), 62 km from the middle of the area, began a volume at 22:14 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 247May 5, 5:45 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.2 hours before the alert went out and 137 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: 164 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.1

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, 6:40 AM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Collingsworth, Foard and 12 more	2 hr
May 5, 12:21 PM CDT	Mesoscale Discussion	SPC	Delta, Fannin, Franklin, Grayson, Hopkins, Lamar and 2 more	84 min
May 5, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 13 more	4 hr
May 5, 3:06 PM CDT	Mesoscale Discussion	SPC	Callahan, Coleman, Eastland, Jones, Nolan, Palo Pinto and 6 more	54 min
May 5, 3:53 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Red River	97 min
May 5, 5:46 PM CDT	Tornado Watch	SPC	Bosque, Brown, Callahan, Coke, Coleman, Comanche and 20 more	6 hr

Nearby

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.