Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 632

April 30, 20126 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2012, 2:08 PM CDT for 6 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2012, 2:08 PM CDT (19:08 UTC)
Expired: Apr 30, 2012, 3:45 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Crane County, TX, Ector County, TX, Midland County, TX, Pecos County, TX, Terrell County, TX, Upton County, TX

The radar

The Midland/Odessa radar (KMAF), 122 km from the middle of the area, began a volume at 19:12 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 209Apr 30, 2:35 PM CDT

The nearest sounding before it

Midland Regional, TX (KMAF), launched 12:00Z, 7.1 hours before the alert went out and 122 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: 1590 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 184 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

326 
ACUS11 KWNS 301909
SWOMCD
SPC MCD 301908
TXZ000-302045-

MESOSCALE DISCUSSION 0632
NWS STORM PREDICTION CENTER NORMAN OK
0208 PM CDT MON APR 30 2012

AREAS AFFECTED...SOUTHWEST TX

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 301908Z - 302045Z

SEVERE POTENTIAL...MAINLY IN THE FORM OF LARGE HAIL...SHOULD
INCREASE THROUGH MID/LATE AFTERNOON ACROSS PORTIONS OF SOUTHWEST
TX...AT LEAST ON AN ISOLATED BASIS. WILL MONITOR CONVECTIVE TRENDS
FOR A POSSIBLE WATCH ISSUANCE.

TSTMS HAVE BEGUN TO DEVELOP ACROSS THE TRANSPECOS REGION OF
SOUTHWEST TX IN VICINITY OF THE DAVIS MOUNTAINS AS OF 1845Z. TSTMS
SHOULD FURTHER INCREASE/DEVELOP GENERALLY EASTWARD OVER THE NEXT FEW
HOURS...WITH ADDITIONAL/AT LEAST ISOLATED DEVELOPMENT ALSO POSSIBLE
FARTHER NORTH LATER THIS AFTERNOON IN VICINITY OF A NORTH-SOUTH
ORIENTED DRYLINE. STEEPENING LOW/MID LEVEL LAPSE RATES IN
CONJUNCTION WITH A RELATIVELY MOIST AIRMASS WILL ALLOW FOR MODERATE
DESTABILIZATION/QUICKLY ERODING CINH THIS AFTERNOON. MID-LEVEL
WEST-SOUTHWESTERLY FLOW IS NOT PARTICULARLY STRONG ACROSS THE REGION
/AROUND 30 KT/ PER REGIONAL PROFILERS...BUT THE DEGREE OF
DESTABILIZATION AND EAST-SOUTHEASTERLY LOW-LEVEL WINDS ACROSS
SOUTHWESTERN TX SHOULD BE SUFFICIENT FOR SOME SUPERCELLS CAPABLE OF
LARGE HAIL. A WATCH COULD BE NEEDED.

..GUYER.. 04/30/2012

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

ATTN...WFO...SJT...MAF...

LAT...LON   30390410 31010374 31380307 32340244 32140149 29940197
            30390410

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 7:23 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Bailey, Borden, Briscoe, Castro, Cochran and 14 more	4 hr
Apr 29, 7:33 PM CDT	Mesoscale Discussion	SPC	Carson, Dallam, Gray, Hansford, Hartley, Hemphill and 8 more	87 min
Apr 29, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Carson, Collingsworth, Donley, Gray, Hemphill and 6 more	6 hr
Apr 29, 10:04 PM CDT	Mesoscale Discussion	SPC	Armstrong, Borden, Briscoe, Carson, Castro, Childress and 29 more	86 min
Apr 29, 10:31 PM CDT	Mesoscale Discussion	SPC	Dallam, Hansford, Lipscomb, Ochiltree, Sherman	119 min
Apr 29, 10:50 PM CDT	Severe Thunderstorm Watch	SPC	Bailey, Borden, Castro, Cochran, Dawson, Garza and 11 more	4 hr
Apr 30, 12:38 AM CDT	Mesoscale Discussion	SPC	Armstrong, Carson, Collingsworth, Donley, Gray, Hansford and 9 more	37 min
Apr 30, 2:15 AM CDT	Mesoscale Discussion	SPC	Briscoe, Castro, Crosby, Dickens, Floyd, Garza and 5 more	30 min
Apr 30, 2:39 PM CDT	Severe Thunderstorm Watch	SPC	Borden, Brewster, Crane, Dawson, Ector, Howard and 12 more	7 hr
Apr 30, 2:58 PM CDT	Mesoscale Discussion	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Cochran and 21 more	62 min
Apr 30, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	Armstrong, Bailey, Briscoe, Carson, Castro, Childress and 35 more	7 hr
Apr 30, 5:19 PM CDT	Mesoscale Discussion	SPC	Gray, Hemphill, Lipscomb, Ochiltree, Roberts, Wheeler	56 min
Apr 30, 5:42 PM CDT	Tornado Watch	SPC	Armstrong, Briscoe, Carson, Childress, Collingsworth, Donley and 12 more	7 hr
Apr 30, 6:11 PM CDT	Mesoscale Discussion	SPC	Baylor, Borden, Callahan, Coke, Coleman, Concho and 48 more	2 hr
Apr 30, 6:54 PM CDT	Severe Thunderstorm Watch	SPC	Archer, Baylor, Callahan, Coke, Coleman, Concho and 33 more	6 hr

Nearby

Mesoscale Discussions in Texas, 2012 Every 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.