Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 429

April 3, 20129 counties in Oklahoma; 38 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 11:47 AM CDT for 9 counties in Oklahoma; 38 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2012, 11:47 AM CDT (16:47 UTC)
Expired
Apr 3, 2012, 1:45 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 47 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Pushmataha County, OK, Bosque County, TX, Collin County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Freestone 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, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan 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, Tarrant County, TX, Van Zandt County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 14 km from the middle of the area, began a volume at 16:49 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 12:00Z, 4.8 hours before the alert went out and 43 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 12:00Z on 2012-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1939 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 12:00Z on 2012-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 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
1939 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
469 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

608 
ACUS11 KWNS 031647
SWOMCD
SPC MCD 031647 
TXZ000-OKZ000-031845-

MESOSCALE DISCUSSION 0429
NWS STORM PREDICTION CENTER NORMAN OK
1147 AM CDT TUE APR 03 2012

AREAS AFFECTED...SRN OK/N TX

CONCERNING...SEVERE THUNDERSTORM WATCH 132...

VALID 031647Z - 031845Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 132
CONTINUES.

SEVERE THREAT CONTINUES ACROSS THE WW AREA.

LATEST RADAR IMAGERY SHOWS A CLUSTER OF STRONG/LOCALLY SEVERE STORMS
ALONG WRN FRINGES OF THE WATCH...WITH AN INCREASE IN STORMS NOW
ONGOING JUST S OF THE DFW METROPLEX.  

DESPITE ABUNDANT CLOUD COVER...SOME HEATING OF THE WARM SECTOR AHEAD
OF THE COLD FRONT AND SOUTH OF THE NERN TX OUTFLOW BOUNDARY HAS
RESULTED IN LOW-LEVEL DESTABILIZATION -- WHICH WILL SUPPORT
INCREASINGLY SURFACE-BASED STORMS WITH TIME.  ALONG WITH CONTINUED
THREAT FOR HAIL...POTENTIAL FOR LOCALLY DAMAGING WINDS AND ALSO
ISOLATED TORNADOES SHOULD INCREASE -- AS SURFACE-BASED SUPERCELL
POTENTIAL FURTHER INCREASES IN THE FAVORABLY SHEARED/DESTABILIZING
ENVIRONMENT.  GIVEN THIS...UPGRADE OF ROUGHLY THE SRN HALF OF WW 132
TO A TORNADO WATCH MAY BECOME NECESSARY...WITH THIS THREAT LIKELY
SPREADING INTO NERN TX LATER THIS AFTERNOON.

..GOSS.. 04/03/2012

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

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

LAT...LON   31109873 34489796 34399513 31159601 31109873

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 7:17 PM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper, Roger Mills, Texas58 min
Apr 2, 9:12 PM CDTMesoscale DiscussionSPCBeaver, Beckham, Caddo, Comanche, Cotton, Custer and 13 more63 min
Apr 2, 10:51 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more5 hr
Apr 3, 1:14 AM CDTMesoscale DiscussionSPCCarter, Cleveland, Comanche, Cotton, Garfield, Garvin and 12 more2 hr
Apr 3, 3:32 AM CDTMesoscale DiscussionSPCCaddo, Canadian, Comanche, Cotton, Grady, Jefferson and 2 more88 min
Apr 3, 8:36 AM CDTMesoscale DiscussionSPCBryan, Carter, Jefferson, Johnston, Love, Marshall and 2 more84 min
Apr 3, 9:18 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more8 hr
Apr 3, 2:21 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Johnston, Love and 2 more84 min
Apr 3, 2:36 PM CDTTornado WatchSPCMcCurtain7 hr
Apr 3, 3:05 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Johnston and 5 more85 min
Apr 3, 3:43 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 3 more6 hr
Apr 2, 11:45 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more2 hr
Apr 3, 12:08 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more9 hr
Apr 3, 1:12 PM CDTMesoscale DiscussionSPCBosque, Collin, Dallas, Denton, Ellis, Erath and 16 more93 min
Apr 3, 1:46 PM CDTMesoscale DiscussionSPCCamp, Cass, Cherokee, Franklin, Gregg, Harrison and 9 more89 min
Apr 3, 4:38 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more67 min
Apr 3, 5:00 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Delta, Falls and 18 more60 min
Apr 3, 6:53 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bastrop, Bowie, Brazos, Burleson and 24 more67 min

Nearby

Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012

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.