Alert archive / Texas / Mesoscale Discussions in 2018

Mesoscale Discussion 1576

October 13, 201829 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2018, 1:56 PM CDT for 29 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 13, 2018, 1:56 PM CDT (18:56 UTC)
Expired
Oct 13, 2018, 4:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 29 counties

Anderson County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Burnet County, TX, Cherokee County, TX, Coryell County, TX, Falls County, TX, Freestone County, TX, Grimes County, TX, Henderson County, TX, Hill County, TX, Houston County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Llano County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Nacogdoches County, TX, Navarro County, TX, Robertson County, TX, Rusk County, TX, San Saba County, TX, Smith County, TX, Trinity County, TX, Walker County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 71 km from the middle of the area, began a volume at 18:57 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, 6.9 hours before the alert went out and 180 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 2018-10-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLEL10008507005003002001001 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 2018-10-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 258 square meters per square second.193958Sfc1 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
5 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
469 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
258 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

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
Oct 12, 7:22 PM CDTMesoscale DiscussionSPCCrane, Crockett, Ector, Glasscock, Irion, Jeff Davis and 9 more2 hr
Oct 12, 8:14 PM CDTSevere Thunderstorm WatchSPCAndrews, Brewster, Crane, Culberson, Ector, Glasscock and 13 more8 hr
Oct 12, 10:58 PM CDTMesoscale DiscussionSPCCrane, Ector, Glasscock, Loving, Midland, Pecos and 6 more2 hr
Oct 13, 1:40 AM CDTMesoscale DiscussionSPCConcho, Crane, Crockett, Ector, Gillespie, Glasscock and 16 more65 min
Oct 13, 1:59 AM CDTSevere Thunderstorm WatchSPCConcho, Crockett, Irion, Kimble, McCulloch, Mason and 5 more6 hr
Oct 13, 7:40 AM CDTTornado WatchSPCBrown, Coleman, Concho, McCulloch, Menard, Runnels and 3 more4 hr
Oct 13, 7:47 AM CDTMesoscale DiscussionSPCBell, Bosque, Brown, Burnet, Coleman, Comanche and 13 more118 min
Oct 13, 9:54 AM CDTTornado WatchSPCAnderson, Bell, Bosque, Burnet, Comanche, Coryell and 22 more9 hr
Oct 13, 11:04 AM CDTMesoscale DiscussionSPCAnderson, Bell, Bosque, Brown, Burnet, Comanche and 27 more116 min
Oct 13, 3:06 PM CDTTornado WatchSPCAngelina, Cherokee, Gregg, Harrison, Houston, Madison and 7 more5 hr
Oct 13, 5:34 PM CDTMesoscale DiscussionSPCAnderson, Bell, Falls, Freestone, Leon, Milam and 1 more56 min
Oct 13, 6:41 PM CDTMesoscale DiscussionSPCAngelina, Harrison, Houston, Madison, Nacogdoches, Panola and 4 more94 min

Nearby

Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018

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.