Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 683

May 13, 200423 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at May 13, 2004, 9:54 AM CDT for 23 counties in Texas. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
May 13, 2004, 9:54 AM CDT (14:54 UTC)
Expired
May 13, 2004, 11:30 AM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 23 counties

Angelina County, TX, Austin County, TX, Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Fayette County, TX, Grimes County, TX, Hardin County, TX, Lee County, TX, Liberty County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Williamson County, TX

The radar

The Houston radar (KHGX), 120 km from the middle of the area, began a volume at 14:53 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 2.9 hours before the alert went out and 240 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, Lake Charles Mun, LA at 12:00Z on 2004-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1515 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, Lake Charles Mun, LA at 12:00Z on 2004-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.1939Sfc1 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
1515 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
727 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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 12, 8:04 PM CDTMesoscale DiscussionSPCArcher, Baylor, Callahan, Fisher, Foard, Hardeman and 13 more86 min
May 13, 3:52 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Brazos, Burleson and 27 more83 min
May 13, 8:30 AM CDTTornado WatchSPCAngelina, Austin, Bastrop, Brazos, Burleson, Caldwell and 17 more6 hr
May 13, 10:20 AM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Cottle, Dickens, Foard and 10 more115 min
May 13, 10:45 AM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Foard, Hardeman, Knox and 2 more6 hr
May 13, 12:10 PM CDTTornado WatchSPCAngelina, Austin, Brazoria, Chambers, Colorado, Fayette and 22 more6 hr
May 13, 12:26 PM CDTMesoscale DiscussionSPCBandera, Brown, Callahan, Coke, Coleman, Concho and 26 more2 hr
May 13, 12:48 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Foard, Haskell, Knox and 4 more117 min
May 13, 12:55 PM CDTTornado WatchSPCBrown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more6 hr
May 13, 1:38 PM CDTMesoscale DiscussionSPCAustin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 15 more97 min
May 13, 2:30 PM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more6 hr
May 13, 2:48 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Haskell, Wichita87 min
May 13, 2:57 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more2 hr
May 13, 3:34 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Caldwell, Comal and 21 more86 min
May 13, 5:22 PM CDTMesoscale DiscussionSPCAngelina, Austin, Brazoria, Chambers, Colorado, Fort Bend and 17 more53 min
May 13, 5:54 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Concho, Eastland, Haskell and 14 more96 min
May 13, 6:55 PM CDTSevere Thunderstorm WatchSPCBandera, Edwards, Gillespie, Kerr, Kimble, Mason and 6 more5 hr

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.