Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 390

March 30, 200751 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2007, 11:53 PM CDT for 51 counties in Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Mar 30, 2007, 11:53 PM CDT (04:53 UTC)
Expired
Mar 31, 2007, 1:00 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 51 counties

Anderson County, TX, Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bell County, TX, Bexar County, TX, Blanco County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Caldwell County, TX, Cherokee County, TX, Comal County, TX, Coryell County, TX, DeWitt County, TX, Edwards County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Grimes County, TX, Guadalupe County, TX, Hays County, TX, Houston County, TX, Karnes County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Kinney County, TX, Lampasas County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, Mason County, TX, McLennan County, TX, McMullen County, TX, Medina County, TX, Milam County, TX, Real County, TX, Robertson County, TX, Travis County, TX, Uvalde County, TX, Walker County, TX, Washington County, TX, Williamson County, TX, Wilson County, TX, Zavala County, TX

The radar

The Austin/San Antonio radar (KEWX), 52 km from the middle of the area, began a volume at 04:55 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.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 4.9 hours before the alert went out and 244 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-pSkew-T log-p diagram, Del Rio, TX at 00:00Z on 2007-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2842 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 00:00Z on 2007-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
2842 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1054 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
1.9
Supercell composite
9.1

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.

IssuedProductOfficeCountiesLasted
Mar 30, 7:38 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 74 more2 hr
Mar 30, 9:48 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 49 more117 min
Mar 30, 10:06 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 16 more84 min
Mar 30, 10:28 PM CDTSevere Thunderstorm WatchSPCBowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more8 hr
Mar 31, 2:12 AM CDTMesoscale DiscussionSPCAransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 32 more93 min
Mar 31, 2:40 AM CDTMesoscale DiscussionSPCBowie, Cass, Cherokee, Gregg, Harrison, Marion and 2 more95 min
Mar 31, 3:17 AM CDTTornado WatchSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 17 more7 hr
Mar 31, 5:30 AM CDTMesoscale DiscussionSPCAransas, Austin, Bee, Brazoria, Calhoun, Chambers and 16 more2 hr
Mar 31, 7:08 AM CDTMesoscale DiscussionSPCAransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 14 more67 min
Mar 31, 8:40 AM CDTSevere Thunderstorm WatchSPCJasper, Newton, Orange, Sabine, San Augustine5 hr

Nearby

Mesoscale Discussions in Texas, 2007Every 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.