Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 658

May 2, 200727 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 2, 2007, 9:57 PM CDT for 27 counties in Texas. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
May 2, 2007, 9:57 PM CDT (02:57 UTC)
Expired
May 2, 2007, 11:00 PM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 27 counties

Aransas County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Jim Wells County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Newton County, TX, Nueces County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Tyler County, TX, Victoria County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 123 km from the middle of the area, began a volume at 03:01 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

Corpus Christi, TX (KCRP), launched 00:00Z, 3.0 hours before the alert went out and 187 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, Corpus Christi, TX at 00:00Z on 2007-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1528 joules per kilogram.LCLLFCEL10008507005003002001001 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, Corpus Christi, TX at 00:00Z on 2007-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 square meters per square second.193958Sfc1 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
1528 J/kg
Mixed-layer CIN
-306 J/kg
Mixed-layer LCL
1292 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
156 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

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
May 2, 7:24 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Atascosa, Austin, Bandera, Bastrop and 110 more96 min
May 2, 7:59 PM CDTTornado WatchSPCAngelina, Bowie, Brazos, Burleson, Camp, Cass and 25 more7 hr
May 2, 9:10 PM CDTMesoscale DiscussionSPCBrewster, Crane, Pecos, Reeves, Terrell, Ward65 min
May 2, 9:30 PM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Collin, Cooke, Coryell and 33 more60 min
May 2, 10:19 PM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 16 more6 hr
May 2, 10:48 PM CDTTornado WatchSPCAransas, Bee, Brooks, Calhoun, Cameron, DeWitt and 17 more5 hr
May 2, 11:09 PM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Franklin, Gregg, Harrison and 12 more96 min
May 2, 11:48 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more87 min
May 3, 12:01 AM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Hardin and 13 more89 min
May 3, 1:21 AM CDTMesoscale DiscussionSPCHarrison, Panola, Sabine, San Augustine, Shelby84 min
May 3, 1:52 AM CDTMesoscale DiscussionSPCCameron, Kenedy, Willacy83 min
May 3, 12:08 PM CDTMesoscale DiscussionSPCBosque, Burnet, Coryell, Hamilton, Hood, Johnson and 7 more97 min
May 3, 2:19 PM CDTMesoscale DiscussionSPCAustin, Chambers, Colorado, Fort Bend, Hardin, Harris and 10 more86 min
May 3, 3:08 PM CDTTornado WatchSPCAngelina, Austin, Brazoria, Brazos, Burleson, Chambers and 26 more7 hr
May 3, 6:34 PM CDTMesoscale DiscussionSPCAngelina, Brazos, Burleson, Chambers, Grimes, Hardin and 19 more116 min
May 3, 6:49 PM CDTMesoscale DiscussionSPCBosque, Dallas, Hamilton, Johnson56 min

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.