Alert archive / Texas / Mesoscale Discussions in 2008

Mesoscale Discussion 732

April 25, 200821 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2008, 4:50 PM CDT for 21 counties in Texas. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2008, 4:50 PM CDT (21:50 UTC)
Expired
Apr 25, 2008, 5:45 PM CDT
In force
55 min
Issued by
the Storm Prediction Center
All 21 counties

Bandera County, TX, Bell County, TX, Blanco County, TX, Burnet County, TX, Coryell County, TX, Edwards County, TX, Falls County, TX, Gillespie County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kimble County, TX, Lampasas County, TX, Llano County, TX, Mason County, TX, McLennan County, TX, Milam County, TX, Real County, TX, Robertson County, TX, Travis County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 112 km from the middle of the area, began a volume at 21:53 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

Del Rio, TX (KDRT), launched 12:00Z, 9.8 hours before the alert went out and 261 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, Del Rio, TX at 12:00Z on 2008-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2587 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, Del Rio, TX at 12:00Z on 2008-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 square meters per square second.19395878Sfc1 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
2587 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
683 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.9
Supercell composite
9.9

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 25, 2:15 PM CDTMesoscale DiscussionSPCCamp, Delta, Ellis, Fannin, Franklin, Hopkins and 9 more90 min
Apr 25, 3:26 PM CDTSevere Thunderstorm WatchSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 28 more7 hr
Apr 25, 5:05 PM CDTMesoscale DiscussionSPCAnderson, Bowie, Camp, Cass, Falls, Franklin and 17 more55 min
Apr 25, 5:32 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Bexar, Blanco, Burnet, Caldwell and 18 more6 hr

Nearby

Mesoscale Discussions in Texas, 2008Every mesoscale discussion in 2008

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.