Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 486

April 10, 20124 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2012, 12:52 AM CDT for 4 counties in Oklahoma; 7 counties in Texas. It was in force for 23 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2012, 12:52 AM CDT (05:52 UTC)
Expired: Apr 10, 2012, 1:15 AM CDT
In force: 23 min
Issued by: the Storm Prediction Center

Counties Greer County, OK, Harmon County, OK, Jackson County, OK, Tillman County, OK, Baylor County, TX, Childress County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 52 km from the middle of the area, began a volume at 05:55 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

Norman, OK (KOUN), launched 00:00Z, 5.9 hours before the alert went out and 221 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: 900 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 726 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

113 
ACUS11 KWNS 100553
SWOMCD
SPC MCD 100552
OKZ000-TXZ000-100615-

MESOSCALE DISCUSSION 0486
NWS STORM PREDICTION CENTER NORMAN OK
1252 AM CDT TUE APR 10 2012

AREAS AFFECTED...SWRN OK...NWRN TX

CONCERNING...TORNADO WATCH 154...

VALID 100552Z - 100615Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 154 CONTINUES.

TORNADO/SEVERE THREAT APPEARS TO BE MINIMAL ACROSS WW 154. SMALL MCS
ALONG THE RED RIVER HAS RAPIDLY DIMINISHED DURING THE PAST HOUR IN
BOTH REFLECTIVITY AND LIGHTNING TRENDS. THIS IS LIKELY A RESULT OF
INCREASING CIN AND PROGRESSIVELY WEAKER BUOYANCY WITH SERN EXTENT.
LITTLE APPRECIABLE REASONING EXISTS FOR ACTIVITY TO RESTRENGTHEN
BEFORE THE SCHEDULED 07Z EXPIRATION OF WW 154.

..GRAMS.. 04/10/2012

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

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

LAT...LON   34799999 35049934 34669875 33899885 33419896 33400002
            34380039 34799999

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 8:07 PM CDT	Mesoscale Discussion	SPC	Craig, Nowata, Osage, Rogers, Washington	83 min
Apr 9, 8:54 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Comanche, Cotton and 14 more	66 min
Apr 10, 1:56 PM CDT	Mesoscale Discussion	SPC	Choctaw, McCurtain	64 min
Apr 10, 3:35 PM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Ellis, Roger Mills, Texas	115 min
Apr 9, 7:33 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Cochran, Crane, Crosby, Dawson and 25 more	57 min
Apr 10, 12:25 AM CDT	Mesoscale Discussion	SPC	Brewster, Pecos, Presidio, Terrell	35 min

Nearby

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