Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 348

March 26, 200716 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2007, 2:31 PM CDT for 16 counties in Texas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Mar 26, 2007, 2:31 PM CDT (19:31 UTC)
Expired: Mar 26, 2007, 3:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Atascosa County, TX, Bexar County, TX, Comal County, TX, Duval County, TX, Frio County, TX, Guadalupe County, TX, Jim Hogg County, TX, Jim Wells County, TX, Karnes County, TX, La Salle County, TX, Live Oak County, TX, McMullen County, TX, Starr County, TX, Webb County, TX, Wilson County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 137 km from the middle of the area, began a volume at 19:33 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 77Mar 26, 3:00 PM CDT

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 7.5 hours before the alert went out and 155 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: 648 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

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
Mar 25, 10:35 PM CDT	Mesoscale Discussion	SPC	Crockett, Edwards, Kimble, Schleicher, Sutton, Val Verde	115 min
Mar 26, 11:57 AM CDT	Mesoscale Discussion	SPC	Bandera, Dimmit, Frio, Kendall, Medina, Zavala	63 min
Mar 26, 2:59 PM CDT	Severe Thunderstorm Watch	SPC	Atascosa, Bexar, Comal, Dimmit, Duval, Frio and 12 more	6 hr
Mar 26, 6:32 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bandera, Bee, Bexar, Blanco and 31 more	88 min

Nearby

Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.