Alert archive / Texas / Mesoscale Discussions in 2014

Mesoscale Discussion 256

April 3, 20147 counties in Oklahoma; 32 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2014, 6:42 AM CDT for 7 counties in Oklahoma; 32 counties in Texas. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2014, 6:42 AM CDT (11:42 UTC)
Expired: Apr 3, 2014, 8:15 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 39 counties

Atoka County, OK, Bryan County, OK, Choctaw County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Pushmataha County, OK, Camp County, TX, Collin County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Montague County, TX, Morris County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 66 km from the middle of the area, began a volume at 11:46 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, 11.7 hours before the alert went out and 244 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: 2297 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 8.6

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 3, 9:18 AM CDT	Mesoscale Discussion	SPC	Adair, LeFlore, Sequoyah	57 min
Apr 3, 12:33 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Haskell and 12 more	87 min
Apr 3, 1:15 PM CDT	Tornado Watch	SPC	Adair, Cherokee, Choctaw, Craig, Delaware, Haskell and 13 more	8 hr
Apr 3, 1:46 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 9 more	89 min
Apr 3, 1:50 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Coal, Hughes, Johnston, Love and 4 more	7 hr
Apr 3, 3:48 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Haskell, Latimer, LeFlore and 7 more	57 min
Apr 3, 2:30 PM CDT	Mesoscale Discussion	SPC	Bandera, Bexar, Blanco, Brown, Burnet, Comal and 23 more	90 min

Nearby

Mesoscale Discussions in Texas, 2014 Mesoscale Discussions in Oklahoma, 2014 Every mesoscale discussion in 2014

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.