Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 876

May 22, 201117 counties in Oklahoma; 40 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 8:10 PM CDT for 17 counties in Oklahoma; 40 counties in Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
May 22, 2011, 8:10 PM CDT (01:10 UTC)
Expired
May 22, 2011, 9:15 PM CDT
In force
65 min
Issued by
the Storm Prediction Center
All 57 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Garvin County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Seminole County, OK, Bosque County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 58 km from the middle of the area, began a volume at 01:13 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

Fort Worth, TX (KFWD), launched 00:00Z, 1.2 hours before the alert went out and 29 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, Fort Worth, TX at 00:00Z on 2011-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3311 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, Fort Worth, TX at 00:00Z on 2011-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.19395878Sfc1 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
3311 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1257 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
1.6
Supercell composite
13.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

209 
ACUS11 KWNS 230111
SWOMCD
SPC MCD 230110
OKZ000-TXZ000-230215-

MESOSCALE DISCUSSION 0876
NWS STORM PREDICTION CENTER NORMAN OK
0810 PM CDT SUN MAY 22 2011

AREAS AFFECTED...SRN OK...NRN TX

CONCERNING...TORNADO WATCH 326...

VALID 230110Z - 230215Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 326 CONTINUES.

WW 326 MAY NEED TO BE EXTENDED IN TIME...OR REPLACED BY A NEW WW
DURING THE NEXT HR.

AT 01Z...CLUSTERS OF STORMS AND ISOLATED RIGHT AND LEFT MOVING
SUPERCELLS WERE ONGOING ACROSS PORTIONS OF NRN TX AND SRN OK. THOUGH
CONVECTIVE INHIBITION WILL STEADILY INCREASE INTO THE
NIGHT...COMBINATION OF STRENGTHENING SLY LLJ AND RESERVOIR OF
INSTABILITY COINCIDENT WITH ONGOING STORMS /MUCAPE VALUES AOA 2500 J
PER KG/ WILL LIKELY AID STORM PERSISTENCE THROUGH THE EVENING AND
EARLY NIGHT. UPSCALE GROWTH INTO A QLCS REMAINS POSSIBLE OVER
NRN/NERN TX AND SRN/SERN OK...POSING A CONTINUED THREAT FOR LARGE
HAIL/DAMAGING WINDS AND PERHAPS A FEW TORNADOES.

..GARNER.. 05/23/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...SHV...TSA...FWD...OUN...SJT...

LAT...LON   35209719 35229472 32499533 31789662 31199855 31469900
            32229953 35209719

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 7:52 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Haskell, McIntosh and 9 more53 min
May 22, 8:47 PM CDTTornado WatchSPCAdair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 6 more7 hr
May 22, 11:46 PM CDTMesoscale DiscussionSPCHaskell, Sequoyah89 min
May 23, 5:07 AM CDTMesoscale DiscussionSPCAdair, Alfalfa, Blaine, Canadian, Cherokee, Cleveland and 29 more113 min
May 23, 5:41 AM CDTMesoscale DiscussionSPCCraig, Nowata, Osage, Ottawa, Washington94 min
May 23, 6:08 AM CDTSevere Thunderstorm WatchSPCCraig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more7 hr
May 23, 7:38 AM CDTMesoscale DiscussionSPCCraig, Delaware, Mayes, Nowata, Ottawa, Rogers and 2 more97 min
May 23, 9:14 AM CDTMesoscale DiscussionSPCLeFlore, McCurtain, Pushmataha91 min
May 23, 12:12 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Craig, Delaware, Mayes, Nowata and 2 more93 min
May 23, 2:08 PM CDTMesoscale DiscussionSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more97 min
May 23, 2:30 PM CDTTornado WatchSPCAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more8 hr
May 23, 5:07 PM CDTMesoscale DiscussionSPCAdair, Cherokee, Coal, Creek, Delaware, Garvin and 21 more23 min
May 23, 5:24 PM CDTTornado WatchSPCAdair, Cherokee, Creek, Haskell, Latimer, LeFlore and 13 more4 hr
May 23, 6:51 PM CDTMesoscale DiscussionSPCBlaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more84 min
May 22, 8:59 PM CDTSevere Thunderstorm WatchSPCBell, Bosque, Collin, Comanche, Coryell, Dallas and 28 more2 hr
May 23, 9:57 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Collin, Dallas, Delta and 30 more33 min
May 23, 9:59 AM CDTSevere Thunderstorm WatchSPCBosque, Collin, Comanche, Cooke, Dallas, Delta and 29 more6 hr
May 23, 12:10 PM CDTMesoscale DiscussionSPCAnderson, Bosque, Bowie, Camp, Cass, Cherokee and 46 more65 min
May 23, 4:58 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Eastland, Shackelford, Stephens and 2 more62 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.