Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 1902

August 6, 20049 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 6, 2004, 2:40 PM CDT for 9 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 6, 2004, 2:40 PM CDT (19:40 UTC)
Expired: Aug 6, 2004, 4:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bailey County, TX, Castro County, TX, Deaf Smith County, TX, Hale County, TX, Hartley County, TX, Lamb County, TX, Oldham County, TX, Parmer County, TX, Randall County, TX

The radar

The Amarillo radar (KAMA), 94 km from the middle of the area, began a volume at 19:40 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 716Aug 6, 4:05 PM CDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.7 hours before the alert went out and 94 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: 489 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 640 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 204 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
Aug 6, 4:05 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Cochran and 19 more	5 hr
Aug 6, 6:29 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Castro, Cochran, Crosby and 10 more	61 min

Nearby

Mesoscale Discussions in Texas, 2004 Every mesoscale discussion in 2004

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.