Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 847

May 9, 200811 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 9, 2008, 8:14 PM CDT for 11 counties in Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: May 9, 2008, 8:14 PM CDT (01:14 UTC)
Expired: May 9, 2008, 9:15 PM CDT
In force: 61 min
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), 35 km from the middle of the area, began a volume at 01:17 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, 1.2 hours before the alert went out and 202 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: 7 J/kg
Mixed-layer CIN: -351 J/kg
Mixed-layer LCL: 1895 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 104 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 10, 4:05 AM CDT	Mesoscale Discussion	SPC	Red River, Titus	115 min
May 10, 12:47 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Collin, Cooke, Delta and 11 more	88 min
May 10, 1:38 PM CDT	Tornado Watch	SPC	Bowie, Camp, Cass, Collin, Delta, Fannin and 16 more	10 hr
May 10, 3:59 PM CDT	Mesoscale Discussion	SPC	Bandera, Bell, Blanco, Bosque, Burnet, Coryell and 13 more	2 hr
May 10, 4:16 PM CDT	Tornado Watch	SPC	Anderson, Bell, Bosque, Collin, Coryell, Dallas and 20 more	5 hr

Nearby

Mesoscale Discussions in Texas, 2008 Every mesoscale discussion in 2008

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.