Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 635

May 1, 200711 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 1, 2007, 6:51 AM CDT for 11 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2007, 6:51 AM CDT (11:51 UTC)
Expired: May 1, 2007, 9:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bell County, TX, Burnet County, TX, Coryell County, TX, Falls County, TX, Lampasas County, TX, Limestone County, TX, Llano County, TX, McLennan County, TX, Milam County, TX, Robertson County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 48 km from the middle of the area, began a volume at 11:53 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 00:00Z, 11.9 hours before the alert went out and 215 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: 32 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1555 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 67 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 1, 1:03 AM CDT	Mesoscale Discussion	SPC	Bell, Bosque, Brown, Burnet, Callahan, Coke and 31 more	2 hr
May 1, 3:31 PM CDT	Mesoscale Discussion	SPC	Austin, Bandera, Bastrop, Bell, Bexar, Blanco and 47 more	89 min
May 1, 3:48 PM CDT	Tornado Watch	SPC	Austin, Bandera, Bastrop, Bexar, Blanco, Brazos and 29 more	7 hr

Nearby

Mesoscale Discussions in Texas, 2007 Every mesoscale discussion in 2007

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.