Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 176

April 1, 201524 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2015, 2:23 PM CDT for 24 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Apr 1, 2015, 2:23 PM CDT (19:23 UTC)
Expired: Apr 1, 2015, 5:00 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 24 counties

Bosque County, TX, Brown County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hill County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Lampasas County, TX, McCulloch County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, San Saba County, TX, Somervell County, TX, Tarrant County, TX, Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 87 km from the middle of the area, began a volume at 19:24 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

Fort Worth, TX (KFWD), launched 12:00Z, 7.4 hours before the alert went out and 103 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: 503 J/kg
Mixed-layer CIN: -223 J/kg
Mixed-layer LCL: 816 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Mar 31, 8:14 PM CDT	Mesoscale Discussion	SPC	Cottle, Foard, Hardeman, Wheeler, Wichita, Wilbarger	91 min
Mar 31, 9:40 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Wichita, Wilbarger	6 hr
Apr 1, 3:57 PM CDT	Mesoscale Discussion	SPC	Collingsworth, Hemphill, Lipscomb, Wheeler	93 min

Nearby

Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.