Alert archive / Texas / Mesoscale Discussions in 2009

Mesoscale Discussion 876

May 26, 200912 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 26, 2009, 8:23 PM CDT for 12 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 26, 2009, 8:23 PM CDT (01:23 UTC)
Expired: May 26, 2009, 10:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Dimmit County, TX, Duval County, TX, Edwards County, TX, Jim Wells County, TX, Kinney County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Zavala County, TX

The radar

The Laughlin AFB radar (KDFX), 45 km from the middle of the area, began a volume at 01:23 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

Del Rio, TX (KDRT), launched 00:00Z, 1.4 hours before the alert went out and 85 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: 1174 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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
May 26, 7:19 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Collin, Comanche and 42 more	86 min
May 26, 10:08 PM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Collin, Comanche, Cooke, Coryell and 31 more	67 min
May 27, 8:38 AM CDT	Mesoscale Discussion	SPC	Aransas, Atascosa, Bee, Calhoun, DeWitt, Dimmit and 13 more	97 min
May 27, 3:56 PM CDT	Mesoscale Discussion	SPC	Brooks, Dimmit, Edwards, Frio, Hidalgo, Jim Hogg and 11 more	64 min

Nearby

Mesoscale Discussions in Texas, 2009 Every mesoscale discussion in 2009

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.