Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 679

May 2, 200927 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2009, 8:04 PM CDT for 27 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 2, 2009, 8:04 PM CDT (01:04 UTC)
Expired: May 2, 2009, 9:30 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

All 27 counties

Borden County, TX, Callahan County, TX, Coleman County, TX, Comanche County, TX, Dawson County, TX, Eastland County, TX, Erath County, TX, Fisher County, TX, Gaines County, TX, Garza County, TX, Haskell County, TX, Howard County, TX, Jones County, TX, Kent County, TX, Lynn County, TX, Martin County, TX, Mitchell County, TX, Nolan County, TX, Palo Pinto County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Taylor County, TX, Terry County, TX, Throckmorton County, TX, Yoakum County, TX

The radar

The Dyess AFB radar (KDYX), 121 km from the middle of the area, began a volume at 01:04 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 nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 1.1 hours before the alert went out and 177 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: 157 J/kg
Mixed-layer CIN: -370 J/kg
Mixed-layer LCL: 1972 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 186 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 2, 7:38 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Dallas, Ellis, Franklin and 15 more	97 min
May 2, 9:59 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Delta, Fannin, Franklin, Hopkins and 5 more	3 hr
May 2, 10:40 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Dallas, Delta, Franklin and 15 more	2 hr
May 2, 11:43 PM CDT	Severe Thunderstorm Watch	SPC	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 6 more	5 hr
May 3, 2:39 AM CDT	Mesoscale Discussion	SPC	Camp, Cherokee, Gregg, Harrison, Henderson, Kaufman and 10 more	2 hr
May 3, 3:02 AM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brown, Burnet, Collin and 28 more	118 min
May 3, 5:12 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Brazos, Burleson, Cherokee, Freestone and 28 more	7 hr
May 3, 6:54 AM CDT	Mesoscale Discussion	SPC	Angelina, Grimes, Hardin, Harrison, Jasper, Liberty and 14 more	2 hr
May 3, 9:24 AM CDT	Mesoscale Discussion	SPC	Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 3 more	66 min

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.