Alert archive / Texas / Mesoscale Discussions in 2011

Mesoscale Discussion 944

May 24, 201112 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 11:00 PM CDT for 12 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: May 24, 2011, 11:00 PM CDT (04:00 UTC)
Expired: May 25, 2011, 12:00 AM CDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Anderson County, TX, Bell County, TX, Burnet County, TX, Coryell County, TX, Falls County, TX, Freestone County, TX, Hill County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Navarro County, TX

The radar

The Ft Hood radar (KGRK), 89 km from the middle of the area, began a volume at 04:03 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.

Severe Thunderstorm Watch 365May 24, 11:20 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 4.0 hours before the alert went out and 149 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: 2867 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1457 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 357 m²/s²
0-3 km storm-relative helicity: 602 m²/s²
Significant tornado parameter: 6.2
Supercell composite: 44.3

Open this sounding in Storm Lab

The text

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

294 
ACUS11 KWNS 250400
SWOMCD
SPC MCD 250400 
TXZ000-250500-

MESOSCALE DISCUSSION 0944
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CDT TUE MAY 24 2011

AREAS AFFECTED...CNTRL THROUGH S-CNTRL TX

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 250400Z - 250500Z

STORMS MAY CONTINUE BUILDING SWD INTO CNTRL AND S-CNTRL TX THROUGH
THE EARLY MORNING. PRIMARY THREATS WILL BE ISOLATED LARGE HAIL AND
DAMAGING WIND...BUT A TORNADO OR TWO MAY ALSO BE POSSIBLE.

STORMS HAVE BEEN BACKBUILDING ALONG A NE-SW ORIENTED BOUNDARY FROM
NERN THROUGH CNTRL TX. THE ATMOSPHERE IS MODERATELY UNSTABLE SOUTH
AND EAST OF THE STORMS...AND DESPITE INCREASING CONVECTIVE
INHIBITION...DEEP LAYER CONVERGENCE IS LIKELY BEING AUGMENTED BY
VIGOROUS SHORTWAVE TROUGH MOVING THROUGH THE CNTRL/SRN PLAINS.
VERTICAL SHEAR REMAINS SUFFICIENT FOR SUPERCELL STRUCTURES EMBEDDED
WITHIN THE LINE.

..DIAL.. 05/25/2011

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

ATTN...WFO...HGX...FWD...EWX...SJT...

LAT...LON   31579803 32309648 32139559 31479534 30659752 30809920
            31579803

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 7:42 PM CDT	Mesoscale Discussion	SPC	Bowie, Franklin, Red River, Titus	63 min
May 24, 8:05 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Delta, Fannin, Franklin and 15 more	7 hr
May 24, 11:22 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Coryell, Falls, Freestone, Henderson and 7 more	5 hr
May 24, 11:24 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Franklin, Hopkins, Marion and 5 more	96 min
May 25, 3:10 AM CDT	Mesoscale Discussion	SPC	Bastrop, Bell, Blanco, Brazos, Burleson, Burnet and 8 more	95 min
May 25, 1:53 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Gregg and 10 more	2 hr
May 25, 3:16 PM CDT	Tornado Watch	SPC	Angelina, Cass, Cherokee, Gregg, Harrison, Marion and 6 more	7 hr
May 25, 5:15 PM CDT	Mesoscale Discussion	SPC	Anderson, Austin, Bastrop, Brazos, Burleson, Caldwell and 23 more	60 min

Nearby

Mesoscale Discussions in Texas, 2011 Every 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.