Alert archive / Texas / Mesoscale Discussions in 2004

Mesoscale Discussion 2291

October 4, 200420 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 4, 2004, 10:14 AM CDT for 20 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 4, 2004, 10:14 AM CDT (15:14 UTC)
Expired
Oct 4, 2004, 12:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Angelina County, TX, Brazos County, TX, Burleson County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Jasper County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Nacogdoches County, TX, Polk County, TX, Robertson County, TX, San Augustine County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Washington County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 3.2 hours before the alert went out and 219 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, Fort Worth, TX at 12:00Z on 2004-10-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2004-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 206 square meters per square second.19395878Sfc1 km3 km6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
984 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
206 m²/s²
0-3 km storm-relative helicity
338 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

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
Oct 3, 10:40 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Borden, Briscoe, Castro, Cochran and 21 more3 hr
Oct 4, 7:31 AM CDTMesoscale DiscussionSPCAndrews, Borden, Coke, Crane, Dawson, Ector and 20 more29 min
Oct 4, 1:23 PM CDTMesoscale DiscussionSPCChambers, Hardin, Harris, Jasper, Jefferson, Liberty and 8 more2 hr
Oct 4, 4:43 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Bell, Brazos, Burleson, Burnet and 17 more3 hr
Oct 4, 5:15 PM CDTMesoscale DiscussionSPCAndrews, Crane, Culberson, Ector, Gaines, Loving and 5 more3 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.