Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 676

May 2, 200913 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2009, 6:49 PM CDT for 13 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: May 2, 2009, 6:49 PM CDT (23:49 UTC)
Expired: May 2, 2009, 8:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Camp County, TX, Cass County, TX, Franklin County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Rockwall County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 148 km from the middle of the area, began a volume at 23:52 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

Fort Worth, TX (KFWD), launched 12:00Z, 11.8 hours before the alert went out and 141 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: 1140 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 504 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.6

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 1, 7:19 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cooke, Cottle and 21 more	86 min
May 1, 9:36 PM CDT	Mesoscale Discussion	SPC	Fannin, Lamar	84 min
May 2, 2:58 AM CDT	Mesoscale Discussion	SPC	Collingsworth, Gray, Hemphill, Wheeler	3 hr
May 2, 9:23 AM CDT	Mesoscale Discussion	SPC	Bowie, Delta, Lamar, Red River	97 min
May 2, 12:17 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Collin, Delta, Denton and 15 more	7 hr
May 2, 1:24 PM CDT	Mesoscale Discussion	SPC	Bell, Blanco, Bosque, Burnet, Collin, Coryell and 31 more	66 min
May 2, 1:56 PM CDT	Tornado Watch	SPC	Bell, Bosque, Coryell, Dallas, Ellis, Falls and 18 more	4 hr
May 2, 3:04 PM CDT	Mesoscale Discussion	SPC	Anderson, Camp, Cherokee, Gregg, Harrison, Houston and 10 more	26 min
May 2, 3:47 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Dallas, Delta, Franklin and 12 more	58 min
May 2, 5:10 PM CDT	Mesoscale Discussion	SPC	Harrison, Panola, Rusk	65 min
May 2, 5:25 PM CDT	Mesoscale Discussion	SPC	Bowie	95 min
May 2, 6:03 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Collin, Dallas, Delta and 27 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.