Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 647

May 11, 200423 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 11, 2004, 9:37 AM CDT for 23 counties in Texas. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued
May 11, 2004, 9:37 AM CDT (14:37 UTC)
Expired
May 11, 2004, 11:30 AM CDT
In force
113 min
Issued by
the Storm Prediction Center
All 23 counties

Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Goliad County, TX, Harris County, TX, Jackson County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Lavaca County, TX, Matagorda County, TX, Montgomery County, TX, Nueces County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Waller County, TX, Wharton County, TX

The radar

The Corpus Christi radar (KCRP), 91 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.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 2.6 hours before the alert went out and 82 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 12:00Z on 2004-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2170 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, Corpus Christi, TX at 12:00Z on 2004-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
2170 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.7

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 10, 7:43 PM CDTMesoscale DiscussionSPCArmstrong, Bailey, Borden, Briscoe, Carson, Castro and 38 more2 hr
May 11, 10:05 AM CDTMesoscale DiscussionSPCBee, Duval, Goliad, Jim Wells, Live Oak, McMullen and 2 more115 min
May 11, 10:55 AM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 33 more5 hr
May 11, 2:00 PM CDTMesoscale DiscussionSPCDallam, Hansford, Hartley, Hutchinson, Moore, Oldham and 1 more2 hr
May 11, 2:33 PM CDTMesoscale DiscussionSPCCrane, Crockett, Glasscock, Irion, Midland, Pecos and 3 more117 min
May 11, 2:58 PM CDTMesoscale DiscussionSPCBrazoria, Fort Bend, Harris, Matagorda62 min
May 11, 3:00 PM CDTMesoscale DiscussionSPCBrazoria, Fort Bend, Harris, Matagorda60 min
May 11, 3:50 PM CDTSevere Thunderstorm WatchSPCChambers, Hardin, Harris, Jefferson, Liberty, Orange3 hr
May 11, 4:05 PM CDTSevere Thunderstorm WatchSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 38 more6 hr
May 11, 6:03 PM CDTMesoscale DiscussionSPCChambers, Hardin, Jefferson, Liberty, Orange57 min

Nearby

Mesoscale Discussions in Texas, 2004Every mesoscale discussion in 2004

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.