Alert archive / Texas / Mesoscale Discussions in 2003

Mesoscale Discussion 476

April 16, 200314 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2003, 1:41 AM CDT for 14 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 16, 2003, 1:41 AM CDT (06:41 UTC)
Expired
Apr 16, 2003, 3:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Brown County, TX, Comanche County, TX, Coryell County, TX, Erath County, TX, Hamilton County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Mills County, TX, San Saba County, TX, Sutton County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 6.7 hours before the alert went out and 257 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 00:00Z on 2003-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 133 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 00:00Z on 2003-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 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
133 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
1178 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.3

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 15, 7:11 PM CDTMesoscale DiscussionSPCBaylor, Borden, Childress, Cottle, Dickens, Fisher and 20 more2 hr
Apr 15, 8:35 PM CDTMesoscale DiscussionSPCClay, Cooke, Grayson, Jack, Montague, Wise115 min
Apr 15, 9:00 PM CDTTornado WatchSPCClay, Cooke, Denton, Grayson, Jack, Montague and 1 more5 hr
Apr 15, 9:04 PM CDTMesoscale DiscussionSPCBaylor, Knox, Wichita, Wilbarger86 min
Apr 15, 11:00 PM CDTMesoscale DiscussionSPCArcher, Clay, Cooke, Jack, Montague, Wise2 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.