Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 609

May 9, 201321 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2013, 9:37 AM CDT for 21 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: May 9, 2013, 9:37 AM CDT (14:37 UTC)
Expired: May 9, 2013, 11:30 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 21 counties

Bell County, TX, Bosque County, TX, Brown County, TX, Burnet County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Coryell County, TX, Falls County, TX, Hamilton County, TX, Hill County, TX, Irion County, TX, Lampasas County, TX, McCulloch County, TX, McLennan County, TX, Menard County, TX, Mills County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Tom Green County, TX

The radar

The Dyess AFB radar (KDYX), 131 km from the middle of the area, began a volume at 14:39 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 150May 9, 11:55 AM CDT

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 2.6 hours before the alert went out and 218 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: 474 J/kg
Mixed-layer CIN: -390 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
May 9, 6:39 AM CDT	Mesoscale Discussion	SPC	Bosque, Brown, Callahan, Coleman, Comanche, Concho and 13 more	3 hr
May 9, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 44 more	9 hr
May 9, 2:52 PM CDT	Mesoscale Discussion	SPC	Angelina, Brazos, Grimes, Hardin, Houston, Jasper and 12 more	53 min
May 9, 3:19 PM CDT	Mesoscale Discussion	SPC	Anderson, Bell, Bosque, Brown, Burnet, Callahan and 42 more	56 min
May 9, 3:34 PM CDT	Severe Thunderstorm Watch	SPC	Angelina, Brazos, Burleson, Chambers, Cherokee, Gregg and 25 more	6 hr
May 9, 5:38 PM CDT	Mesoscale Discussion	SPC	Briscoe, Childress, Collingsworth, Cottle, Crosby, Donley and 4 more	67 min
May 9, 6:12 PM CDT	Mesoscale Discussion	SPC	Anderson, Atascosa, Bandera, Bexar, Blanco, Brown and 47 more	63 min
May 9, 6:40 PM CDT	Mesoscale Discussion	SPC	Angelina, Cherokee, Hardin, Jasper, Liberty, Montgomery and 10 more	2 hr

Nearby

Mesoscale Discussions in Texas, 2013 Every mesoscale discussion in 2013

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.