Alert archive / Texas / Mesoscale Discussions in 2013

Mesoscale Discussion 184

February 21, 2013Jefferson County, Love County, Oklahoma; 22 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Feb 21, 2013, 5:08 AM CST for Jefferson County, Love County, Oklahoma; 22 counties in Texas. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Feb 21, 2013, 5:08 AM CST (11:08 UTC)
Expired
Feb 21, 2013, 6:45 AM CST
In force
97 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 24 counties

Jefferson County, OK, Love County, OK, Bosque County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Comanche County, TX, Cooke County, TX, Denton County, TX, Eastland County, TX, Erath County, TX, Hamilton County, TX, Hood County, TX, Jack County, TX, Johnson County, TX, Mills County, TX, Montague County, TX, Palo Pinto County, TX, Parker County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 78 km from the middle of the area, began a volume at 11:09 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

Midland Regional, TX (KMAF), launched 00:00Z, 11.1 hours before the alert went out and 388 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, Midland Regional, TX at 00:00Z on 2013-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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, Midland Regional, TX at 00:00Z on 2013-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 451 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
21 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
860 m above ground
0-6 km bulk shear
103 kt
0-1 km storm-relative helicity
451 m²/s²
0-3 km storm-relative helicity
459 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
Feb 20, 10:52 PM CSTMesoscale DiscussionSPCComanche, Cotton, Harmon, Jackson, Jefferson, Stephens and 1 more113 min
Feb 20, 11:49 PM CSTMesoscale DiscussionSPCAlfalfa, Beaver, Custer, Dewey, Ellis, Grant and 5 more6 hr
Feb 21, 2:32 AM CSTMesoscale DiscussionSPCAdair, Cherokee, Craig, Creek, Delaware, Kay and 12 more6 hr
Feb 21, 9:27 AM CSTMesoscale DiscussionSPCOttawa4 hr
Feb 21, 3:19 AM CSTMesoscale DiscussionSPCConcho, Gillespie, Kimble, Llano, McCulloch, Mason and 3 more86 min
Feb 21, 7:22 AM CSTMesoscale DiscussionSPCBell, Brazos, Burleson, Falls, Freestone, Grimes and 13 more83 min
Feb 21, 10:53 AM CSTMesoscale DiscussionSPCAngelina, Chambers, Hardin, Harris, Jasper, Jefferson and 6 more97 min
Feb 21, 1:37 PM CSTTornado WatchSPCHardin, Jasper, Newton, Orange, Sabine, Tyler5 hr

Nearby

Mesoscale Discussions in Texas, 2013Mesoscale Discussions in Oklahoma, 2013Every mesoscale discussion in 2013

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.