Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 428

April 3, 20128 counties in Oklahoma; 46 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 8:36 AM CDT for 8 counties in Oklahoma; 46 counties in Texas. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 3, 2012, 8:36 AM CDT (13:36 UTC)
Expired
Apr 3, 2012, 10:00 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 54 counties

Bryan County, OK, Carter County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Stephens County, OK, Archer County, TX, Bell County, TX, Blanco County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Gillespie County, TX, Grayson County, TX, Hamilton County, TX, Hays County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Kendall County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, McLennan County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Rockwall County, TX, San Saba County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Throckmorton County, TX, Williamson County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 93 km from the middle of the area, began a volume at 13:38 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, 1.6 hours before the alert went out and 113 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.

882 
ACUS11 KWNS 031337
SWOMCD
SPC MCD 031336
OKZ000-TXZ000-031500-

MESOSCALE DISCUSSION 0428
NWS STORM PREDICTION CENTER NORMAN OK
0836 AM CDT TUE APR 03 2012

AREAS AFFECTED...CENTRAL AND NRN TX/SRN OK

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 031336Z - 031500Z

STRENGTHENING CONVECTION/INCREASING SEVERE POTENTIAL SUGGEST THAT WW
ISSUANCE MAY BE REQUIRED IN THE NEXT HOUR.

LATEST RADAR LOOP SHOWS STORMS INCREASING IN COVERAGE AND INTENSITY
ACROSS PARTS OF CENTRAL AND N TX...WITHIN ZONE OF ASCENT PIVOTING
NEWD ACROSS CENTRAL AND N TX AROUND THE SERN FRINGE OF THE SRN
ROCKIES UPPER LOW.  STORMS ARE DEVELOPING IN CLOSE PROXIMITY TO THE
SURFACE COLD FRONT -- WHICH HAS PUSHED EWD ACROSS THE WRN HALF OF TX
AND NOW LIES ROUGHLY N-S FROM JUST W OF ABI TO JUST E OF JCT.  E OF
THE FRONT WITHIN THE WARM SECTOR...A SLIGHTLY STABLE BOUNDARY LAYER
IS INDICATED...WITH WIDESPREAD LOW CLOUDS PER LATEST VISIBLE IMAGERY
LIKELY TO HINDER THE INITIATION OF BOUNDARY LAYER
HEATING/DESTABILIZATION OVER THE NEXT COUPLE OF HOURS.
STILL...MORNING FWD /FORT WORTH TX/ RAOB REVEALS STEEP LAPSE
RATES/MODERATE CAPE ABOVE THE BOUNDARY LAYER ALONG WITH AMPLE
CLOUD-LAYER SHEAR.  THUS...EXPECT THREAT FOR LARGE HAIL WITH THE
DEVELOPING CONVECTION ALONG WITH LIMITED WIND GUST POTENTIAL --
POTENTIAL WHICH COULD INCREASE LATER THIS MORNING PRESUMING LOW
CLOUD EROSION ALLOWING HEATING TO COMMENCE.

..GOSS.. 04/03/2012

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

ATTN...WFO...FWD...OUN...EWX...SJT...

LAT...LON   29869908 30419931 32089952 33599916 34479798 34709703
            34119620 33039617 30839736 29829816 29869908

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, 9:18 AM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more8 hr
Apr 3, 11:47 AM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Jefferson, Johnston and 3 more118 min
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.