Alert archive / Texas / Mesoscale Discussions in 2015

Mesoscale Discussion 1878

October 23, 201521 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Oct 23, 2015, 2:32 PM CDT for 21 counties in Texas. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Oct 23, 2015, 2:32 PM CDT (19:32 UTC)
Expired
Oct 23, 2015, 4:30 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 21 counties

Brown County, TX, Coleman County, TX, Comanche County, TX, Concho County, TX, Crockett County, TX, Edwards County, TX, Hamilton County, TX, Irion 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, Schleicher County, TX, Sutton County, TX, Terrell County, TX, Tom Green County, TX, Val Verde County, TX

The radar

The San Angelo radar (KSJT), 109 km from the middle of the area, began a volume at 19:35 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 nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 7.5 hours before the alert went out and 430 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 2015-10-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 278 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 2015-10-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
278 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
729 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Oct 22, 8:15 PM CDTMesoscale DiscussionSPCConcho, Crockett, Edwards, Kimble, Menard, Schleicher and 3 more90 min
Oct 23, 2:31 PM CDTMesoscale DiscussionSPCCallahan, Coke, Coleman, Eastland, Erath, Glasscock and 18 more119 min

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.