Alert archive / Texas / Mesoscale Discussions in 2016

Mesoscale Discussion 367

April 11, 20167 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2016, 4:49 PM CDT for 7 counties in Texas. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2016, 4:49 PM CDT (21:49 UTC)
Expired: Apr 11, 2016, 6:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Collin County, TX, Dallas County, TX, Denton County, TX, Hunt County, TX, Rains County, TX, Rockwall County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 88 km from the middle of the area, began a volume at 21:51 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 12:00Z, 9.8 hours before the alert went out and 75 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1237 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 331 m²/s²
0-3 km storm-relative helicity: 347 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

915 
ACUS11 KWNS 112149
SWOMCD
SPC MCD 112149 
TXZ000-112315-

MESOSCALE DISCUSSION 0367
NWS STORM PREDICTION CENTER NORMAN OK
0449 PM CDT MON APR 11 2016

AREAS AFFECTED...N CENTRAL TX

CONCERNING...SEVERE THUNDERSTORM WATCH 85...

VALID 112149Z - 112315Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 85
CONTINUES.

SUMMARY...VERY LARGE HAIL WILL THREATEN NRN DFW METROPLEX BY ABOUT
23-00Z...BUT THE TORNADO RISK SHOULD REMAIN MARGINAL AT BEST.

DISCUSSION...AN INTENSE SUPERCELL CONTINUES TO MOVE ESEWD-SEWD
ACROSS NRN WISE COUNTY...WITH THE MESOCYCLONE A LITTLE MORE THAN 10
MI N OF AN OUTFLOW BOUNDARY EXTENDING FROM SRN WISE TO NRN DALLAS
COUNTIES.  A SIMILAR SITUATION EXISTS WITH A STORM N OF THE BOUNDARY
IN HUNT COUNTY.  THIS OUTFLOW BOUNDARY CONTINUES TO MOVE SWD...WITH
A CLEAR REDUCTION IN SBCAPE WITHIN THE RELATIVELY NEW/COOL OUTFLOW. 
THE NLY SURFACE WINDS AHEAD OF THE SUPERCELLS ARE HELPING MAINTAIN
FAVORABLE HODOGRAPH STRUCTURES...BUT LOW-LEVEL SRH IS NOT
PARTICULARLY LARGE AND IS UNLIKELY TO OFFSET THE REDUCTIONS IN
BUOYANCY.  THUS...THE TORNADO THREAT WILL REMAIN MARGINAL AND BE
FOCUSED PRIMARILY WITH ANY NEWER SUPERCELL DEVELOPMENT AT THE
OUTFLOW/DRYLINE INTERSECTION IN WRN WISE COUNTY.  DESPITE THE
MARGINAL NATURE OF ANY TORNADO RISK...VERY LARGE HAIL /NEAR BASEBALL
SIZE/ WILL BE POSSIBLE WITH THESE STORMS...PERHAPS AFFECTING THE NRN
PORTIONS OF FORT WORTH AND DALLAS IN THE NEXT COUPLE OF HOURS.

..THOMPSON.. 04/11/2016

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

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

LAT...LON   33159590 32999545 32729546 32629562 32619599 32679641
            32789690 32909732 33269790 33379775 33479749 33389694
            33259633 33159590

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 10, 7:36 PM CDT	Mesoscale Discussion	SPC	Montague	114 min
Apr 10, 8:54 PM CDT	Mesoscale Discussion	SPC	Dimmit, Edwards, Kinney, Maverick, Real, Uvalde and 2 more	66 min
Apr 10, 9:31 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Childress, Clay, Cooke, Cottle and 19 more	59 min
Apr 10, 9:52 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Clay, Cooke, Foard, Hardeman and 4 more	6 hr
Apr 10, 11:06 PM CDT	Mesoscale Discussion	SPC	Atascosa, Bandera, Bexar, Comal, Dimmit, Frio and 9 more	54 min
Apr 11, 6:15 AM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Delta, Denton, Fannin and 7 more	3 hr
Apr 11, 11:48 AM CDT	Mesoscale Discussion	SPC	Bowie, Cass, Marion	2 hr
Apr 11, 12:39 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Camp, Clay, Collin, Cooke and 33 more	2 hr
Apr 11, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	Jasper, Newton, Sabine	6 hr
Apr 11, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Angelina, Bowie, Camp, Cass, Cherokee and 46 more	9 hr
Apr 11, 1:43 PM CDT	Mesoscale Discussion	SPC	Austin, Brazos, Grimes, Hardin, Harris, Liberty and 8 more	3 hr
Apr 11, 3:26 PM CDT	Mesoscale Discussion	SPC	Clay, Collin, Cooke, Dallas, Delta, Denton and 18 more	94 min
Apr 11, 3:42 PM CDT	Mesoscale Discussion	SPC	Newton, Sabine	93 min
Apr 11, 5:27 PM CDT	Mesoscale Discussion	SPC	Archer, Baylor, Fisher, Haskell, Jones, King and 7 more	93 min
Apr 11, 6:09 PM CDT	Mesoscale Discussion	SPC	Newton, Sabine	66 min
Apr 11, 6:58 PM CDT	Severe Thunderstorm Watch	SPC	Cherokee, Nacogdoches, Panola, Rusk, Shelby	5 hr

Nearby

Mesoscale Discussions in Texas, 2016 Every mesoscale discussion in 2016

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.