Alert archive / Texas / Mesoscale Discussions in 2006

Mesoscale Discussion 440

April 6, 20064 counties in Oklahoma; 37 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2006, 1:15 PM CDT for 4 counties in Oklahoma; 37 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2006, 1:15 PM CDT (18:15 UTC)
Expired: Apr 6, 2006, 2:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

All 41 counties

Comanche County, OK, Cotton County, OK, Jefferson County, OK, Stephens County, OK, Archer County, TX, Baylor County, TX, Bosque County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Kimble County, TX, Lampasas County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Wichita County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 51 km from the middle of the area, began a volume at 18:15 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 156Apr 6, 3:45 PM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 6.3 hours before the alert went out and 152 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: 149 J/kg
Mixed-layer CIN: -619 J/kg
Mixed-layer LCL: 812 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 289 m²/s²
0-3 km storm-relative helicity: 289 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.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 11:03 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 24 more	117 min
Apr 6, 12:51 PM CDT	Mesoscale Discussion	SPC	Cleveland, Creek, Garfield, Grant, Kay, Lincoln and 9 more	114 min
Apr 6, 1:26 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 42 more	8 hr
Apr 6, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	6 hr
Apr 6, 4:21 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Haskell and 18 more	84 min
Apr 6, 4:53 PM CDT	Mesoscale Discussion	SPC	Ottawa	97 min

Nearby

Mesoscale Discussions in Texas, 2006 Mesoscale Discussions in Oklahoma, 2006 Every mesoscale discussion in 2006

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.