Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 800

May 6, 200313 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 4:46 PM CDT for 13 counties in Texas. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued: May 6, 2003, 4:46 PM CDT (21:46 UTC)
Expired: May 6, 2003, 6:45 PM CDT
In force: 119 min
Issued by: the Storm Prediction Center

Counties Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 34 km from the middle of the area, began a volume at 21:49 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 274May 6, 5:15 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.8 hours before the alert went out and 32 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: 2816 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1185 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.2

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, 8:44 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 14 more	2 hr
May 6, 9:10 AM CDT	Severe Thunderstorm Watch	SPC	Bell, Bosque, Brown, Burnet, Callahan, Coleman and 28 more	6 hr
May 6, 12:14 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Bexar, Blanco, Burnet, Comal and 16 more	2 hr
May 6, 2:21 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Colorado, Fayette and 11 more	114 min
May 6, 2:47 PM CDT	Mesoscale Discussion	SPC	Collin, Dallas, Delta, Fannin, Franklin, Grayson and 10 more	118 min
May 6, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	Collin, Cooke, Dallas, Delta, Denton, Eastland and 19 more	5 hr

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.