Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 976

May 30, 201234 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 30, 2012, 5:07 AM CDT for 34 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 30, 2012, 5:07 AM CDT (10:07 UTC)
Expired
May 30, 2012, 6:30 AM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 34 counties

Anderson County, TX, Camp County, TX, Cherokee County, TX, Collin County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison 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, Marion County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Tarrant County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 126 km from the middle of the area, began a volume at 10:07 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

Fort Worth, TX (KFWD), launched 00:00Z, 10.1 hours before the alert went out and 129 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 2012-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1364 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 2012-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
1364 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
2060 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.6

Open this sounding in Storm Lab

The text

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

016 
ACUS11 KWNS 301007
SWOMCD
SPC MCD 301007 
LAZ000-TXZ000-301130-

MESOSCALE DISCUSSION 0976
NWS STORM PREDICTION CENTER NORMAN OK
0507 AM CDT WED MAY 30 2012

AREAS AFFECTED...NRN AND CNTRL TX

CONCERNING...SEVERE THUNDERSTORM WATCH 320...

VALID 301007Z - 301130Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 320
CONTINUES.

SUMMARY...LINGERING STORM DEVELOPMENT MAY BEGIN TO SPREAD SOUTH/EAST
OF WW AREA...BUT THE SEVERE THREAT IS NOT ANTICIPATED TO INCREASE
SUFFICIENTLY IN THE NEAR TERM TO REQUIRE AN ADDITIONAL WW.

DISCUSSION...MESO HIGH CENTER HAS CONTINUED TO WEAKEN AS IT DEVELOPS
SOUTHEASTWARD THROUGH NORTHEAST TEXAS.  THE BULK OF ONGOING
CONVECTIVE DEVELOPMENT IS NOW GENERALLY ABOVE THE CORE OF THE COLD
POOL...WHICH MAY BEGIN TO SPREAD SOUTH/EAST OF THE WW AREA ACROSS
PARTS OF NORTHWESTERN LOUISIANA AND EASTERN TEXAS WITHIN THE NEXT
FEW HOURS.  OBSERVATIONAL DATA GENERALLY INDICATES CONTINUED
WEAKENING TRENDS TO THUNDERSTORM ACTIVITY...THOUGH ISOLATED STORM
DEVELOPMENT IN CLOSER PROXIMITY TO THE LOW-LEVEL JET...WEST
NORTHWEST OF DALLAS/FORT WORTH MAY STILL BE OCCASIONALLY PRODUCING
SEVERE HAIL.

..KERR.. 05/30/2012

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

ATTN...WFO...SHV...HGX...FWD...

LAT...LON   33219823 33689704 33259534 32959433 32449397 31689398
            31369471 31489632 31789751 33219823

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 8:54 PM CDTMesoscale DiscussionSPCCollin, Dallas, Denton, Hood, Jack, Johnson and 6 more96 min
May 29, 11:28 PM CDTMesoscale DiscussionSPCCooke, Fannin, Grayson, Lamar, Montague62 min
May 30, 12:43 AM CDTSevere Thunderstorm WatchSPCCamp, Collin, Cooke, Dallas, Delta, Denton and 19 more7 hr
May 30, 2:43 AM CDTMesoscale DiscussionSPCArcher, Baylor, Camp, Cass, Clay, Collin and 37 more92 min
May 30, 2:58 PM CDTMesoscale DiscussionSPCBriscoe, Childress, Collingsworth, Cottle, Dickens, Donley and 8 more62 min
May 30, 3:38 PM CDTTornado WatchSPCBaylor, Briscoe, Childress, Collingsworth, Cottle, Dickens and 15 more5 hr
May 30, 4:52 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Concho, Eastland and 17 more83 min
May 30, 5:11 PM CDTTornado WatchSPCBrown, Burnet, Callahan, Coke, Coleman, Comanche and 27 more6 hr
May 30, 6:13 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Cooke, Denton, Jack and 5 more8 hr

Nearby

Mesoscale Discussions in Texas, 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.