Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 778

May 19, 20174 counties in Oklahoma; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 19, 2017, 10:41 AM CDT for 4 counties in Oklahoma; 15 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 19, 2017, 10:41 AM CDT (15:41 UTC)
Expired: May 19, 2017, 12:15 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Carter County, OK, Jefferson County, OK, Love County, OK, Marshall County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Fisher County, TX, Haskell County, TX, Jack County, TX, Jones County, TX, Montague County, TX, Palo Pinto County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 88 km from the middle of the area, began a volume at 15:43 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.

Tornado Watch 246May 19, 12:25 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 3.7 hours before the alert went out and 143 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: 1189 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 18, 7:19 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Garfield, Grant, Major, Woods	26 min
May 18, 7:43 PM CDT	Mesoscale Discussion	SPC	Carter, Jefferson, Johnston, Love, Murray, Pontotoc	62 min
May 18, 7:47 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Atoka, Bryan, Canadian, Carter, Cleveland and 26 more	6 hr
May 18, 9:41 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, Haskell, Latimer and 4 more	94 min
May 19, 2:13 PM CDT	Mesoscale Discussion	SPC	Adair, Ottawa, Sequoyah	92 min
May 19, 3:26 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 19 more	11 hr
May 19, 3:28 PM CDT	Mesoscale Discussion	SPC	Grant, Kay	92 min
May 19, 4:47 PM CDT	Tornado Watch	SPC	Alfalfa, Grant, Kay	4 hr
May 19, 6:56 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 24 more	2 hr
May 18, 9:08 PM CDT	Mesoscale Discussion	SPC	Brown, Clay, Comanche, Cooke, Denton, Eastland and 10 more	37 min
May 19, 2:17 AM CDT	Mesoscale Discussion	SPC	Callahan, Coke, Crane, Ector, Fisher, Glasscock and 9 more	118 min
May 19, 2:44 AM CDT	Severe Thunderstorm Watch	SPC	Callahan, Coke, Fisher, Glasscock, Haskell, Howard and 13 more	6 hr
May 19, 7:03 AM CDT	Mesoscale Discussion	SPC	Callahan, Collin, Dallas, Denton, Eastland, Ellis and 15 more	117 min
May 19, 12:26 PM CDT	Tornado Watch	SPC	Brown, Callahan, Coke, Coleman, Comanche, Concho and 19 more	7 hr
May 19, 2:45 PM CDT	Mesoscale Discussion	SPC	Callahan, Coke, Coleman, Concho, Fisher, Irion and 10 more	60 min
May 19, 5:50 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Concho, Eastland and 11 more	115 min

Nearby

Mesoscale Discussions in Texas, 2017 Mesoscale Discussions in Oklahoma, 2017 Every mesoscale discussion in 2017

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.