Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 433

April 24, 201549 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2015, 11:12 AM CDT for 49 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2015, 11:12 AM CDT (16:12 UTC)
Expired
Apr 24, 2015, 1:15 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 49 counties

Bosque County, TX, Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Collin County, TX, Comanche County, TX, Concho County, TX, Cooke County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Fannin County, TX, Fisher County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Irion County, TX, Jack County, TX, Johnson County, TX, Jones County, TX, Kaufman County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Nolan County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Rockwall County, TX, Runnels County, TX, Shackelford County, TX, Somervell County, TX, Stephens County, TX, Sterling County, TX, Tarrant County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX, Van Zandt County, TX, Wise County, TX, Young County, TX

The radar

The Dyess AFB radar (KDYX), 69 km from the middle of the area, began a volume at 16:12 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

Fort Worth, TX (KFWD), launched 12:00Z, 4.2 hours before the alert went out and 134 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 2015-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1508 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 2015-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
1508 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
506 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
309 m²/s²
Significant tornado parameter
1.2
Supercell composite
4.6

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 23, 9:34 PM CDTMesoscale DiscussionSPCBandera, Dimmit, Edwards, Frio, Jim Hogg, Kinney and 10 more56 min
Apr 24, 2:36 AM CDTMesoscale DiscussionSPCDimmit, La Salle, McMullen, Webb, Zavala84 min
Apr 24, 3:01 AM CDTSevere Thunderstorm WatchSPCAtascosa, Dimmit, Frio, La Salle, Live Oak, McMullen and 5 more4 hr
Apr 24, 5:41 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Dimmit, Duval, Edwards, Frio and 10 more94 min
Apr 24, 10:29 AM CDTMesoscale DiscussionSPCHardin, Jasper, Liberty, Newton, Orange, Tyler91 min
Apr 24, 11:53 AM CDTMesoscale DiscussionSPCHardin, Jefferson, Newton, Orange97 min
Apr 24, 12:18 PM CDTTornado WatchSPCJasper, Newton, Orange5 hr
Apr 24, 12:56 PM CDTMesoscale DiscussionSPCChildress, Collingsworth, Cottle, Crosby, Dickens, Foard and 3 more94 min
Apr 24, 2:10 PM CDTTornado WatchSPCAnderson, Bell, Bosque, Brown, Callahan, Coke and 52 more8 hr
Apr 24, 3:58 PM CDTMesoscale DiscussionSPCAngelina, Camp, Cass, Cherokee, Gregg, Harrison and 16 more92 min
Apr 24, 4:45 PM CDTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 20 more5 hr
Apr 24, 4:56 PM CDTMesoscale DiscussionSPCAtascosa, Dimmit, Duval, Frio, Jim Hogg, Kinney and 9 more94 min
Apr 24, 6:01 PM CDTMesoscale DiscussionSPCDallas, Ellis, Erath, Hood, Johnson, Kaufman and 3 more59 min
Apr 24, 6:53 PM CDTSevere Thunderstorm WatchSPCAtascosa, Bee, Brooks, Cameron, DeWitt, Dimmit and 19 more6 hr

Nearby

Mesoscale Discussions in Texas, 2015Every mesoscale discussion in 2015

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.