Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 495

April 11, 2012Eddy County, Lea County, New Mexico; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2012, 8:12 PM MDT for Eddy County, Lea County, New Mexico; 22 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2012, 8:12 PM MDT (02:12 UTC)
Expired: Apr 11, 2012, 9:45 PM MDT
In force: 93 min
Issued by: the Storm Prediction Center

All 24 counties

Eddy County, NM, Lea County, NM, Andrews County, TX, Cochran County, TX, Crane County, TX, Dawson County, TX, Ector County, TX, Gaines County, TX, Hale County, TX, Hockley County, TX, Jeff Davis County, TX, Loving County, TX, Lubbock County, TX, Lynn County, TX, Martin County, TX, Midland County, TX, Pecos County, TX, Reeves County, TX, Terrell County, TX, Terry County, TX, Upton County, TX, Ward County, TX, Winkler County, TX, Yoakum County, TX

The radar

The Midland/Odessa radar (KMAF), 69 km from the middle of the area, began a volume at 02:13 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

Midland Regional, TX (KMAF), launched 00:00Z, 2.2 hours before the alert went out and 68 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: 733 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1111 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -40 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

438 
ACUS11 KWNS 120212
SWOMCD
SPC MCD 120212 
TXZ000-NMZ000-120345-

MESOSCALE DISCUSSION 0495
NWS STORM PREDICTION CENTER NORMAN OK
0912 PM CDT WED APR 11 2012

AREAS AFFECTED...SWRN TX AND PORTIONS OF S TX PLAINS

CONCERNING...SEVERE THUNDERSTORM WATCH 156...

VALID 120212Z - 120345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 156
CONTINUES.

ISOLATED SEVERE THREAT WILL CONTINUE THE NEXT 1-3 HOURS. A LOCAL
EXTENSION IN SPACE/TIME MAY BE NEEDED FOR PORTIONS OF WW 156 THROUGH
AROUND 05Z. 

A SMALL LINEAR/BOWING SEGMENT HAS DEVELOPED ACROSS YOAKUM COUNTY
TEXAS AND IS LIKELY PRODUCING NEAR SEVERE WIND GUSTS /PLAINS TX
MESONET SITE REPORTED 51 KT GUST/ IN ADDITION TO HAIL. WHILE TRENDS
HAVE BEEN FOR STORMS TO GENERALLY WEAKEN OVER THE LAST HOUR OR
SO...SHOULD A COLD POOL BECOME WELL ESTABLISHED THIS BOWING SEGMENT
COULD CONTINUE TO PERSIST AS IT TRACKS EWD INTO THE LUB CWA AND OUT
OF WHAT IS CURRENTLY WW 156. THEREFORE AN EXTENSION IN TIME AND
SPACE WILL LIKELY BE NEEDED.

FURTHER SOUTH...ISOLATED STORMS WERE LIKELY PRODUCING SEVERE HAIL
ACROSS SOUTHWEST TX. THESE STORMS SHOULD BECOME INCREASINGLY
ELEVATED AS THE BOUNDARY LAYER COOLS AND STABILIZES. ISOLATED SEVERE
HAIL WILL BE POSSIBLE BEYOND THE 03Z EXPIRATION TIME OF WW 156 AND
AN EXTENSION IN TIME WILL LIKELY BE NEEDED. STORMS SHOULD WEAKEN
AFTER 05Z.

..LEITMAN.. 04/12/2012

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

ATTN...WFO...EWX...SJT...LUB...MAF...ABQ...

LAT...LON   33950240 34200180 34170158 33880137 30080171 29990172
            30050422 32520471 33950240

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 7:54 PM MDT	Mesoscale Discussion	SPC	Armstrong, Carson, Donley, Gray, Hansford, Hartley and 8 more	66 min
Apr 12, 1:28 PM MDT	Mesoscale Discussion	SPC	Carson, Gray, Hansford, Hemphill, Hutchinson, Lipscomb and 2 more	2 hr
Apr 12, 2:34 PM MDT	Mesoscale Discussion	SPC	Childress, Collingsworth, Foard, Hardeman, Wilbarger	86 min
Apr 12, 5:06 PM MDT	Mesoscale Discussion	SPC	Baylor, Childress, Collingsworth, Cottle, Foard, Hall and 5 more	114 min

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in New Mexico, 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.