Alert archive / Texas / Mesoscale Discussions in 2017

Mesoscale Discussion 401

April 2, 201725 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 2, 2017, 9:44 AM CDT for 25 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 2, 2017, 9:44 AM CDT (14:44 UTC)
Expired
Apr 2, 2017, 11:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 25 counties

Austin County, TX, Bastrop County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Cherokee County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Gonzales County, TX, Grimes County, TX, Houston County, TX, Karnes County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Robertson County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Ft Hood radar (KGRK), 95 km from the middle of the area, began a volume at 14:44 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

Corpus Christi, TX (KCRP), launched 12:00Z, 2.7 hours before the alert went out and 255 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, Corpus Christi, TX at 12:00Z on 2017-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3410 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, Corpus Christi, TX at 12:00Z on 2017-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 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
3410 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
521 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
328 m²/s²
Significant tornado parameter
3.7
Supercell composite
20.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 7:20 PM CDTMesoscale DiscussionSPCVal Verde85 min
Apr 1, 8:44 PM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 5 more61 min
Apr 1, 10:06 PM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Comal, Edwards, Gillespie and 9 more114 min
Apr 1, 10:28 PM CDTTornado WatchSPCBandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more8 hr
Apr 2, 2:53 AM CDTMesoscale DiscussionSPCBandera, Edwards, Gillespie, Kerr, Kimble, Kinney and 6 more82 min
Apr 2, 5:16 AM CDTMesoscale DiscussionSPCAnderson, Angelina, Bandera, Bastrop, Bell, Bexar and 51 more119 min
Apr 2, 6:00 AM CDTTornado WatchSPCAnderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 51 more7 hr
Apr 2, 9:04 AM CDTMesoscale DiscussionSPCAngelina, Houston, Jasper, Montgomery, Nacogdoches, Newton and 8 more2 hr
Apr 2, 10:39 AM CDTTornado WatchSPCAngelina, Austin, Cherokee, Colorado, Gregg, Hardin and 20 more5 hr
Apr 2, 12:22 PM CDTMesoscale DiscussionSPCAngelina, Nacogdoches, Sabine, San Augustine, Shelby, Trinity83 min
Apr 2, 1:34 PM CDTTornado Watch PDSSPCAngelina, Hardin, Jasper, Nacogdoches, Newton, Orange and 4 more7 hr
Apr 2, 2:06 PM CDTMesoscale DiscussionSPCSabine54 min
Apr 2, 4:23 PM CDTMesoscale DiscussionSPCAransas, Brazoria, Calhoun, Cameron, Jackson, Kenedy and 5 more3 hr
Apr 2, 5:54 PM CDTMesoscale DiscussionSPCHardin, Jasper, Newton, Orange96 min

Nearby

Mesoscale Discussions in Texas, 2017Every mesoscale discussion in 2017

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.