Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 485

April 10, 20124 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2012, 12:25 AM CDT for 4 counties in Texas. It was in force for 35 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2012, 12:25 AM CDT (05:25 UTC)
Expired: Apr 10, 2012, 1:00 AM CDT
In force: 35 min
Issued by: the Storm Prediction Center

Counties Brewster County, TX, Pecos County, TX, Presidio County, TX, Terrell County, TX

The radar

The Midland/Odessa radar (KMAF), 233 km from the middle of the area, began a volume at 05:27 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, 5.4 hours before the alert went out and 233 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: 617 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1776 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

422 
ACUS11 KWNS 100526
SWOMCD
SPC MCD 100525
TXZ000-100600-

MESOSCALE DISCUSSION 0485
NWS STORM PREDICTION CENTER NORMAN OK
1225 AM CDT TUE APR 10 2012

AREAS AFFECTED...FAR WRN TX

CONCERNING...SEVERE THUNDERSTORM WATCH 153...

VALID 100525Z - 100600Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 153
CONTINUES.

SRN PORTION OF WW 153 COULD BE LOCALLY EXTENDED GIVEN ONGOING
SUPERCELL OVER WRN PECOS COUNTY...BUT AN ADDITIONAL WW DOES NOT
APPEAR NECESSARY AS SEVERE THREAT IS EXPECTED TO RAPIDLY DIMINISH IN
THE NEXT COUPLE OF HOURS.

SURFACE DEW POINTS CONTINUE TO SLOWLY DROP IN THE DOWNSTREAM AIR
MASS...WITH MODIFIED RR/RUC SOUNDINGS SUGGESTING MINIMAL BUOYANCY
BEYOND THE LOWER PECOS VALLEY. EVENING MODEL GUIDANCE ALL INDICATE
LOW-LEVEL S/SELYS WILL DIMINISH THIS MORNING. AS SUCH...ONGOING
SEVERE TSTMS WILL LIKELY WEAKEN AND MAY TEND TO DEVELOP
S/SEWD...PERHAPS MERGING WITH A TSTM CLUSTER NEAR THE BIG BEND.

..GRAMS.. 04/10/2012

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

ATTN...WFO...EWX...MAF...

LAT...LON   30330442 30770316 30890221 30660184 29960168 29390226
            28930313 29180415 29930471 30330442

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 7:33 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Crane, Crosby, Dawson and 25 more	57 min
Apr 9, 8:54 PM CDT	Mesoscale Discussion	SPC	Foard, Hardeman, Wichita, Wilbarger	66 min
Apr 10, 12:52 AM CDT	Mesoscale Discussion	SPC	Baylor, Childress, Cottle, Foard, Hardeman, Knox and 1 more	23 min
Apr 10, 1:56 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Delta, Gregg, Harrison and 8 more	64 min
Apr 10, 3:35 PM CDT	Mesoscale Discussion	SPC	Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 20 more	115 min

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.