Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 627

April 30, 2012Roger Mills County, Oklahoma; 15 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2012, 12:38 AM CDT for Roger Mills County, Oklahoma; 15 counties in Texas. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Apr 30, 2012, 12:38 AM CDT (05:38 UTC)
Expired
Apr 30, 2012, 1:15 AM CDT
In force
37 min
Issued by
the Storm Prediction Center

Counties Roger Mills County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 61 km from the middle of the area, began a volume at 05:38 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, 5.6 hours before the alert went out and 60 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, Amarillo Airport, TX at 00:00Z on 2012-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 63 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, Amarillo Airport, TX at 00:00Z on 2012-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.1939587897Sfc1 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
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.

884 
ACUS11 KWNS 300539
SWOMCD
SPC MCD 300538
OKZ000-TXZ000-300615-

MESOSCALE DISCUSSION 0627
NWS STORM PREDICTION CENTER NORMAN OK
1238 AM CDT MON APR 30 2012

AREAS AFFECTED...TX AND OK PANHANDLES

CONCERNING...SEVERE THUNDERSTORM WATCH 203...206...

VALID 300538Z - 300615Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
203...206...CONTINUES.

STORMS HAVE DECREASED ACROSS WW 203 AND 206...PARTICULARLY ACROSS WW
203 OVER SWRN KS AND THE OK PANHANDLE.  FARTHER S...A FEW STORMS
REMAIN SEVERE ACROSS THE TX PANHANDLE/WW 206.  HERE...AMPLE
INSTABILITY WILL SUPPORT A CONTINUATION OF THE STORMS -- AND
SUFFICIENT SHEAR FOR ORGANIZED STORMS SHOULD MAINTAIN LOCAL SEVERE
THREAT.  THUS...WHILE WW 203 CAN BE ALLOWED TO EXPIRE AT THE TOP OF
THE HOUR...WW 206 WILL BE EXTENDED LOCALLY FOR A COUPLE MORE HOURS
-- UNTIL STORMS SHIFT INTO WRN OK AND/OR WEAKEN.

..GOSS.. 04/30/2012

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

ATTN...WFO...OUN...LUB...AMA...

LAT...LON   34740214 35560221 36400169 36519988 35629968 34679996
            34740214

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 7:33 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Ellis, Harper, Roger Mills, Woods and 1 more87 min
Apr 29, 8:04 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Blaine, Craig, Creek, Custer, Delaware and 23 more7 hr
Apr 29, 10:31 PM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Craig, Creek, Custer, Delaware and 23 more119 min
Apr 30, 2:20 AM CDTMesoscale DiscussionSPCBlaine, Craig, Creek, Custer, Delaware, Dewey and 15 more25 min
Apr 30, 2:58 PM CDTMesoscale DiscussionSPCCimarron, Texas62 min
Apr 30, 3:36 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas7 hr
Apr 30, 5:19 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Dewey, Ellis, Harper and 3 more56 min
Apr 30, 5:42 PM CDTTornado WatchSPCAlfalfa, Beaver, Beckham, Blaine, Custer, Dewey and 12 more7 hr
Apr 30, 6:55 PM CDTMesoscale DiscussionSPCAlfalfa, Craig, Garfield, Grant, Kay, Noble and 7 more2 hr
Apr 29, 7:23 PM CDTSevere Thunderstorm WatchSPCAndrews, Bailey, Borden, Briscoe, Castro, Cochran and 14 more4 hr
Apr 29, 8:55 PM CDTSevere Thunderstorm WatchSPCArmstrong, Carson, Collingsworth, Donley, Gray, Hemphill and 6 more6 hr
Apr 29, 10:04 PM CDTMesoscale DiscussionSPCArmstrong, Borden, Briscoe, Carson, Castro, Childress and 29 more86 min
Apr 29, 10:50 PM CDTSevere Thunderstorm WatchSPCBailey, Borden, Castro, Cochran, Dawson, Garza and 11 more4 hr
Apr 30, 2:15 AM CDTMesoscale DiscussionSPCBriscoe, Castro, Crosby, Dickens, Floyd, Garza and 5 more30 min
Apr 30, 2:08 PM CDTMesoscale DiscussionSPCCrane, Ector, Midland, Pecos, Terrell, Upton97 min
Apr 30, 2:39 PM CDTSevere Thunderstorm WatchSPCBorden, Brewster, Crane, Dawson, Ector, Howard and 12 more7 hr
Apr 30, 6:11 PM CDTMesoscale DiscussionSPCBaylor, Borden, Callahan, Coke, Coleman, Concho and 48 more2 hr
Apr 30, 6:54 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Callahan, Coke, Coleman, Concho and 33 more6 hr

Nearby

Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 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.