Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 254

April 2, 200414 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2004, 5:10 PM CST for 14 counties in Texas. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Apr 2, 2004, 5:10 PM CST (23:10 UTC)
Expired: Apr 2, 2004, 6:45 PM CST
In force: 95 min
Issued by: the Storm Prediction Center

Counties Brooks County, TX, Cameron County, TX, Dimmit County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, La Salle County, TX, McMullen County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 132 km from the middle of the area, began a volume at 23:09 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

Corpus Christi, TX (KCRP), launched 12:00Z, 11.2 hours before the alert went out and 146 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: 891 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.4

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
Apr 1, 6:52 PM CST	Mesoscale Discussion	SPC	Edwards, Kimble, Kinney, Menard, Real, Schleicher and 3 more	83 min
Apr 2, 10:59 AM CST	Mesoscale Discussion	SPC	Crockett, Edwards, Kinney, Maverick, Reagan, Real and 5 more	2 hr
Apr 2, 12:34 PM CST	Mesoscale Discussion	SPC	Howard, Irion, Sterling, Tom Green	86 min
Apr 2, 1:08 PM CST	Mesoscale Discussion	SPC	Culberson, Loving, Reeves	3 hr
Apr 2, 1:51 PM CST	Mesoscale Discussion	SPC	Dimmit, Edwards, Kinney, Maverick, Real, Sutton and 2 more	114 min
Apr 2, 2:25 PM CST	Severe Thunderstorm Watch	SPC	Bandera, Concho, Dimmit, Duval, Edwards, Frio and 19 more	6 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; radar from the NEXRAD Level II archive.