Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 790

May 26, 2015Cotton County, Jefferson County, Tillman County, Oklahoma; 20 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 26, 2015, 5:42 PM CDT for Cotton County, Jefferson County, Tillman County, Oklahoma; 20 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: May 26, 2015, 5:42 PM CDT (22:42 UTC)
Expired: May 26, 2015, 7:15 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 23 counties

Cotton County, OK, Jefferson County, OK, Tillman County, OK, Archer County, TX, Baylor County, TX, Callahan County, TX, Clay County, TX, Eastland County, TX, Erath County, TX, Haskell County, TX, Hood County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 72 km from the middle of the area, began a volume at 22:43 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 226May 26, 9:25 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.7 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1151 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 143 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
May 26, 1:35 PM CDT	Mesoscale Discussion	SPC	Caddo, Carter, Comanche, Cotton, Grady, Greer and 6 more	85 min
May 26, 2:53 PM CDT	Tornado Watch	SPC	Cotton, Jackson, Jefferson, Tillman	7 hr
May 26, 3:22 PM CDT	Mesoscale Discussion	SPC	Craig, Creek, Delaware, Kay, Lincoln, Mayes and 10 more	53 min
May 26, 5:27 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 22 more	7 hr
May 25, 8:05 PM CDT	Mesoscale Discussion	SPC	Angelina, Austin, Brazoria, Chambers, Colorado, DeWitt and 22 more	85 min
May 25, 11:13 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Bee, Brazoria, Caldwell, Calhoun and 26 more	92 min
May 26, 3:54 PM CDT	Mesoscale Discussion	SPC	Coke, Crockett, Irion, Reagan, Schleicher, Sterling and 4 more	66 min
May 26, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Coke, Coleman, Concho, Crockett, Glasscock and 14 more	4 hr

Nearby

Mesoscale Discussions in Texas, 2015 Mesoscale Discussions in Oklahoma, 2015 Every mesoscale discussion in 2015

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.