Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 724

May 11, 2011Texas County, Oklahoma; 37 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2011, 2:28 AM CDT for Texas County, Oklahoma; 37 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 11, 2011, 2:28 AM CDT (07:28 UTC)
Expired
May 11, 2011, 4:00 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 38 counties

Texas County, OK, Armstrong County, TX, Bailey County, TX, Borden County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Cochran County, TX, Crosby County, TX, Dawson County, TX, Deaf Smith County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Gaines County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hockley County, TX, Howard County, TX, Hutchinson County, TX, Lamb County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Moore County, TX, Motley County, TX, Ochiltree County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Swisher County, TX, Terry County, TX

The radar

The Amarillo radar (KAMA), 67 km from the middle of the area, began a volume at 07:28 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

Midland Regional, TX (KMAF), launched 00:00Z, 7.5 hours before the alert went out and 307 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-pSkew-T log-p diagram, Midland Regional, TX at 00:00Z on 2011-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 62 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Midland Regional, TX at 00:00Z on 2011-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
62 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
3567 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
41 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.

IssuedProductOfficeCountiesLasted
May 11, 7:30 AM CDTMesoscale DiscussionSPCBeaver, Beckham, Ellis, Harmon, Harper, Roger Mills60 min
May 11, 12:33 PM CDTMesoscale DiscussionSPCAtoka, Coal, Creek, Haskell, Hughes, Johnston and 19 more87 min
May 11, 1:16 PM CDTSevere Thunderstorm WatchSPCAdair, Atoka, Bryan, Caddo, Canadian, Carter and 53 more8 hr
May 11, 1:51 PM CDTMesoscale DiscussionSPCBeaver, Harper84 min
May 11, 2:51 PM CDTMesoscale DiscussionSPCMcCurtain84 min
May 11, 3:46 PM CDTSevere Thunderstorm WatchSPCMcCurtain8 hr
May 11, 6:02 PM CDTMesoscale DiscussionSPCEllis, Harper, Woods, Woodward88 min
May 11, 6:35 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, LeFlore, Mayes and 3 more55 min
May 11, 3:29 AM CDTSevere Thunderstorm WatchSPCAndrews, Armstrong, Bailey, Borden, Briscoe, Carson and 46 more8 hr
May 11, 9:56 AM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Comanche, Concho and 20 more94 min
May 11, 10:21 AM CDTSevere Thunderstorm WatchSPCBell, Bosque, Brown, Burnet, Callahan, Coleman and 52 more5 hr

Nearby

Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 2011Every mesoscale discussion in 2011

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.