Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 325

April 10, 20046 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2004, 9:20 PM CDT for 6 counties in Texas. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2004, 9:20 PM CDT (02:20 UTC)
Expired: Apr 10, 2004, 10:45 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center

Counties Brooks County, TX, Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Starr County, TX, Willacy County, TX

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 67Apr 10, 9:35 PM CDT

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 2.3 hours before the alert went out and 97 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: 2551 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 624 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 7.3

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
Apr 10, 7:19 PM CDT	Mesoscale Discussion	SPC	San Augustine	86 min
Apr 10, 8:00 PM CDT	Severe Thunderstorm Watch	SPC	Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more	3 hr
Apr 10, 9:35 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more	5 hr
Apr 10, 10:52 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bee, Bexar, DeWitt, Dimmit, Duval and 14 more	2 hr
Apr 11, 1:39 AM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more	66 min
Apr 11, 10:14 AM CDT	Mesoscale Discussion	SPC	Austin, Bee, Brazoria, Calhoun, Chambers, Colorado and 23 more	4 hr
Apr 11, 1:45 PM CDT	Mesoscale Discussion	SPC	Jefferson, Orange	3 hr

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.