Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 328

April 11, 20048 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2004, 1:39 AM CDT for 8 counties in Texas. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
Apr 11, 2004, 1:39 AM CDT (06:39 UTC)
Expired
Apr 11, 2004, 2:45 AM CDT
In force
66 min
Issued by
the Storm Prediction Center

Counties Brooks County, TX, Cameron County, TX, Hidalgo County, TX, Jim Hogg County, TX, Kenedy County, TX, Starr County, TX, Willacy County, TX, Zapata County, TX

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 00:00Z, 6.7 hours before the alert went out and 128 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, Brownsville Intl, TX at 00:00Z on 2004-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2551 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, Brownsville Intl, TX at 00:00Z on 2004-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
2551 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
1.9
Supercell composite
7.3

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
Apr 10, 7:19 PM CDTMesoscale DiscussionSPCSan Augustine86 min
Apr 10, 8:00 PM CDTSevere Thunderstorm WatchSPCBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more3 hr
Apr 10, 9:20 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Hidalgo, Kenedy, Starr, Willacy85 min
Apr 10, 9:35 PM CDTSevere Thunderstorm WatchSPCBrooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more5 hr
Apr 10, 10:52 PM CDTMesoscale DiscussionSPCAtascosa, Bee, Bexar, DeWitt, Dimmit, Duval and 14 more2 hr
Apr 11, 10:14 AM CDTMesoscale DiscussionSPCAustin, Bee, Brazoria, Calhoun, Chambers, Colorado and 23 more4 hr
Apr 11, 1:45 PM CDTMesoscale DiscussionSPCJefferson, Orange3 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.