Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 1872

July 23, 20086 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2008, 6:56 AM CDT for 6 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2008, 6:56 AM CDT (11:56 UTC)
Expired: Jul 23, 2008, 8:30 AM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Calhoun County, TX, Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Matagorda County, TX, Willacy County, TX

The radar

The Corpus Christi radar (KCRP), 70 km from the middle of the area, began a volume at 11:58 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.

Tornado Watch 734Jul 23, 9:40 AM CDT

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 11.9 hours before the alert went out and 161 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: 2229 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 666 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 57 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
Jul 22, 10:27 PM CDT	Tornado Watch	SPC	Brooks, Cameron, Hidalgo, Kenedy, Kleberg, Nueces and 1 more	11 hr
Jul 23, 9:00 AM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brooks, Calhoun, Cameron, Goliad and 12 more	60 min
Jul 23, 9:39 AM CDT	Tornado Watch	SPC	Aransas, Bee, Brazoria, Brooks, Calhoun, Cameron and 20 more	113 min
Jul 23, 11:27 AM CDT	Tornado Watch	SPC	Aransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 19 more	8 hr
Jul 23, 1:28 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 16 more	2 hr
Jul 23, 3:52 PM CDT	Mesoscale Discussion	SPC	Aransas, Bee, Brooks, Calhoun, DeWitt, Duval and 14 more	113 min
Jul 23, 5:38 PM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Brooks, Calhoun, Duval and 15 more	97 min

Nearby

Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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.