Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 823

May 20, 20115 counties in Oklahoma; 17 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 20, 2011, 2:58 AM CDT for 5 counties in Oklahoma; 17 counties in Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
May 20, 2011, 2:58 AM CDT (07:58 UTC)
Expired
May 20, 2011, 4:30 AM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 22 counties

Comanche County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK, Baylor County, TX, Coke County, TX, Fisher County, TX, Foard County, TX, Glasscock County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, Knox County, TX, Mitchell County, TX, Nolan County, TX, Reagan County, TX, Scurry County, TX, Sterling County, TX, Stonewall County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Dyess AFB radar (KDYX), 112 km from the middle of the area, began a volume at 08:01 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 nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 8.0 hours before the alert went out and 176 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 2011-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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 2011-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
11 J/kg
Mixed-layer CIN
-67 J/kg
Mixed-layer LCL
3474 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
61 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 19, 7:47 PM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Kiowa and 1 more118 min
May 19, 11:39 PM CDTSevere Thunderstorm WatchSPCHarmon, Jackson, Tillman6 hr
May 20, 9:11 AM CDTMesoscale DiscussionSPCCraig, Delaware, Ottawa2 hr
May 20, 10:30 AM CDTMesoscale DiscussionSPCBryan, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more60 min
May 20, 11:03 AM CDTTornado WatchSPCAdair, Choctaw, Haskell, Latimer, LeFlore, McCurtain and 2 more7 hr
May 20, 1:28 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Choctaw, Haskell, Latimer, LeFlore and 3 more62 min
May 20, 1:52 PM CDTMesoscale DiscussionSPCEllis, Harper, Woods, Woodward113 min
May 20, 2:32 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more7 hr
May 20, 4:00 PM CDTMesoscale DiscussionSPCChoctaw, LeFlore, McCurtain, Pushmataha60 min
May 20, 5:56 PM CDTTornado WatchSPCMcCurtain3 hr
May 20, 6:01 PM CDTMesoscale DiscussionSPCAlfalfa, Ellis, Garfield, Grant, Harper, Major and 2 more59 min
May 19, 9:36 PM CDTMesoscale DiscussionSPCBorden, Briscoe, Childress, Coke, Collingsworth, Cottle and 28 more84 min
May 20, 12:08 PM CDTMesoscale DiscussionSPCAnderson, Bandera, Bastrop, Bell, Blanco, Bosque and 56 more67 min
May 20, 12:28 PM CDTSevere Thunderstorm WatchSPCAnderson, Bandera, Bastrop, Bell, Bexar, Blanco and 60 more10 hr
May 20, 5:34 PM CDTMesoscale DiscussionSPCAnderson, Bandera, Bastrop, Bell, Bexar, Blanco and 41 more116 min

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.