Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 805

May 6, 200318 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 7:48 PM CDT for 18 counties in Texas. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: May 6, 2003, 7:48 PM CDT (00:48 UTC)
Expired: May 6, 2003, 9:45 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center

Counties Collin County, TX, Cooke County, TX, Dallas County, TX, Denton County, TX, Erath County, TX, Fannin County, TX, Grayson County, TX, Hood County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Lamar County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 64 km from the middle of the area, began a volume at 00:48 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 279May 6, 11:30 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.8 hours before the alert went out and 35 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: 2942 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1239 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.4

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 6, 11:08 PM CDT	Mesoscale Discussion	SPC	Bowie, Cass	97 min
May 6, 11:30 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Delta, Franklin, Gregg and 16 more	6 hr
May 7, 2:27 AM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Franklin, Gregg and 16 more	3 hr
May 7, 2:17 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Concho, Dawson, Fisher, Garza and 19 more	103 min
May 7, 5:00 PM CDT	Tornado Watch	SPC	Archer, Armstrong, Baylor, Briscoe, Callahan, Carson and 33 more	6 hr
May 7, 5:38 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Callahan, Clay, Eastland, Fisher and 16 more	97 min

Nearby

Mesoscale Discussions in Texas, 2003 Every mesoscale discussion in 2003

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.