Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 2499

November 17, 200346 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2003, 7:11 AM CST for 46 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Nov 17, 2003, 7:11 AM CST (13:11 UTC)
Expired
Nov 17, 2003, 9:45 AM CST
In force
3 hr
Issued by
the Storm Prediction Center
All 46 counties

Anderson County, TX, Angelina County, TX, Austin County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Colorado County, TX, Dallas County, TX, Ellis County, TX, Fort Bend County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Kaufman County, TX, Leon County, TX, Liberty County, TX, Limestone County, TX, Madison County, TX, Montgomery County, TX, Nacogdoches County, TX, Navarro County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Rusk County, TX, San Augustine County, TX, San Jacinto County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX, Wood County, TX

The watches that followed

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

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 1.2 hours before the alert went out and 241 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 2003-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1175 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, Fort Worth, TX at 12:00Z on 2003-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.1939587897117Sfc1 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
1175 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.6
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
Nov 16, 6:02 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Childress, Cottle, Crosby, Dickens and 12 more118 min
Nov 17, 1:11 AM CSTMesoscale DiscussionSPCClay, Hardeman, Hemphill, Lipscomb, Montague, Wheeler and 2 more3 hr
Nov 17, 7:43 AM CSTMesoscale DiscussionSPCCooke, Fannin, Grayson, Lamar, Montague3 hr
Nov 17, 8:15 AM CSTTornado WatchSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 11 more5 hr
Nov 17, 8:20 AM CSTTornado WatchSPCAnderson, Angelina, Austin, Bastrop, Bell, Brazoria and 54 more5 hr
Nov 17, 9:58 AM CSTMesoscale DiscussionSPCBandera, Bexar, Blanco, Brown, Burnet, Callahan and 36 more92 min
Nov 17, 10:21 AM CSTMesoscale DiscussionSPCBrazoria, Calhoun, Chambers, Fort Bend, Hardin, Harris and 6 more84 min
Nov 17, 10:59 AM CSTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 11 more91 min
Nov 17, 11:50 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Aransas, Austin, Bell, Bosque and 75 more85 min
Nov 17, 12:20 PM CSTTornado WatchSPCBell, Bosque, Collin, Comanche, Cooke, Coryell and 36 more6 hr
Nov 17, 12:45 PM CSTTornado WatchSPCBrazoria, Calhoun, Chambers, Colorado, DeWitt, Fort Bend and 15 more5 hr
Nov 17, 2:57 PM CSTMesoscale DiscussionSPCAnderson, Bell, Bosque, Bowie, Camp, Cass and 42 more2 hr
Nov 17, 3:02 PM CSTMesoscale DiscussionSPCAustin, Brazoria, Calhoun, Chambers, Colorado, DeWitt and 16 more88 min
Nov 17, 5:07 PM CSTMesoscale DiscussionSPCAngelina, Brazoria, Calhoun, Chambers, Fort Bend, Galveston and 14 more53 min
Nov 17, 5:25 PM CSTMesoscale DiscussionSPCBowie, Camp, Cass, Delta, Franklin, Gregg and 15 more65 min
Nov 17, 5:35 PM CSTTornado WatchSPCChambers, Galveston, Hardin, Jasper, Jefferson, Newton and 2 more6 hr

Nearby

Mesoscale Discussions in Texas, 2003Every mesoscale discussion in 2003

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.