Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 628

April 30, 201211 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2012, 2:15 AM CDT for 11 counties in Texas. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued: Apr 30, 2012, 2:15 AM CDT (07:15 UTC)
Expired: Apr 30, 2012, 2:45 AM CDT
In force: 30 min
Issued by: the Storm Prediction Center

Counties Briscoe County, TX, Castro County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Garza County, TX, Hale County, TX, Kent County, TX, Motley County, TX, Scurry County, TX, Swisher County, TX

The radar

The Lubbock radar (KLBB), 60 km from the middle of the area, began a volume at 07:16 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 7.3 hours before the alert went out and 195 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: 63 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 2070 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

864 
ACUS11 KWNS 300715
SWOMCD
SPC MCD 300715 
TXZ000-300745-

MESOSCALE DISCUSSION 0628
NWS STORM PREDICTION CENTER NORMAN OK
0215 AM CDT MON APR 30 2012

AREAS AFFECTED...TX SOUTH PLAINS

CONCERNING...SEVERE THUNDERSTORM WATCH 207...

VALID 300715Z - 300745Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 207
CONTINUES.

SEVERE THREAT CONTINUES TO SLOWLY DIMINISH ACROSS MOST OF WW
207...AS STORMS BECOME INCREASINGLY ISOLATED.  STILL...WITH AMPLE
INSTABILITY AND A PERSISTENT SSELY LOW-LEVEL JET OBSERVED ACROSS THE
AREA...OCCASIONAL/ISOLATED STORM REGENERATION MAY CONTINUE FOR
SEVERAL HOURS -- ALONG WITH ISOLATED HAIL/WIND POTENTIAL. 
STILL...OVERALL THREAT DOES NOT APPEAR TO WARRANT NEW WW ISSUANCE
ATTM -- THOUGH A FEW COUNTIES MAY BE EXTENDED LOCALLY IN
TIME...BEYOND THE SCHEDULED 30/07Z EXPIRATION OF WW 207.

..GOSS.. 04/30/2012

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

ATTN...WFO...SJT...LUB...AMA...MAF...

LAT...LON   32560039 32480113 33110128 34020195 34760240 35000150
            33710048 32560039

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, 2:08 PM CDT	Mesoscale Discussion	SPC	Crane, Ector, Midland, Pecos, Terrell, Upton	97 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.