Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 1924

August 9, 20115 counties in Kansas; 8 counties in Oklahoma; 31 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2011, 8:27 PM CDT for 5 counties in Kansas; 8 counties in Oklahoma; 31 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 2011, 8:27 PM CDT (01:27 UTC)
Expired
Aug 9, 2011, 10:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 44 counties

Clark County, KS, Comanche County, KS, Kiowa County, KS, Meade County, KS, Seward County, KS, Beaver County, OK, Beckham County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Roger Mills County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Briscoe County, TX, Carson County, TX, Castro County, TX, Childress County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Floyd County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lamb County, TX, Lipscomb 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, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 106 km from the middle of the area, began a volume at 01:30 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.5 hours before the alert went out and 105 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, Amarillo Airport, TX at 00:00Z on 2011-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 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, Amarillo Airport, TX at 00:00Z on 2011-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2708 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
64 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
Aug 9, 9:26 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Rawlins, Sheridan and 2 more64 min
Aug 9, 9:51 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more7 hr
Aug 9, 11:11 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Chautauqua, Cowley, Edwards and 28 more94 min
Aug 10, 3:25 AM CDTMesoscale DiscussionSPCBarton, Butler, Cowley, Ellis, Ellsworth, Greenwood and 12 more65 min
Aug 10, 3:42 AM CDTSevere Thunderstorm WatchSPCBarton, Butler, Chase, Chautauqua, Cowley, Elk and 17 more3 hr
Aug 10, 3:53 AM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Rawlins, Sheridan, Sherman and 1 more67 min
Aug 10, 6:54 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Graham, Logan, Norton and 5 more66 min
Aug 9, 10:02 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 28 more88 min
Aug 9, 10:23 PM CDTSevere Thunderstorm WatchSPCAdair, Alfalfa, Beckham, Blaine, Caddo, Canadian and 48 more5 hr
Aug 10, 1:32 AM CDTMesoscale DiscussionSPCCherokee, Cleveland, Creek, Haskell, Hughes, Lincoln and 17 more58 min
Aug 10, 3:15 AM CDTSevere Thunderstorm WatchSPCAdair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 6 more6 hr
Aug 10, 7:27 AM CDTMesoscale DiscussionSPCCreek, Lincoln, McIntosh, Noble, Okfuskee, Okmulgee and 4 more63 min

Nearby

Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Kansas, 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.