Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 1841

October 10, 20148 counties in Arkansas; 15 counties in Oklahoma; 25 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 10, 2014, 2:26 PM CDT for 8 counties in Arkansas; 15 counties in Oklahoma; 25 counties in Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Oct 10, 2014, 2:26 PM CDT (19:26 UTC)
Expired: Oct 10, 2014, 4:00 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 48 counties

Hempstead County, AR, Howard County, AR, Little River County, AR, Montgomery County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pontotoc County, OK, Pushmataha County, OK, Archer County, TX, Callahan County, TX, Clay County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Fannin County, TX, Grayson County, TX, Hunt County, TX, Jack County, TX, Jones County, TX, Lamar County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Red River County, TX, Shackelford County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 96 km from the middle of the area, began a volume at 19:26 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.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 7.4 hours before the alert went out and 200 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: 857 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 683 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.1

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
Oct 10, 3:22 PM CDT	Severe Thunderstorm Watch	SPC	Howard, Little River, Montgomery, Pike, Polk, Scott and 2 more	7 hr
Oct 10, 5:31 PM CDT	Mesoscale Discussion	SPC	Arkansas, Clark, Cleveland, Cross, Dallas, Faulkner and 16 more	89 min
Oct 9, 7:26 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Ellis, Harper, Roger Mills, Texas	94 min
Oct 9, 10:34 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Custer and 11 more	86 min
Oct 10, 3:36 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Concho, Irion and 10 more	84 min
Oct 10, 5:01 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Callahan, Coke, Coleman, Concho, Fisher and 15 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2014 Mesoscale Discussions in Oklahoma, 2014 Mesoscale Discussions in Arkansas, 2014 Every mesoscale discussion in 2014

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.