Alert archive / Texas / Mesoscale Discussions in 2020

Mesoscale Discussion 204

March 19, 202015 counties in Arkansas; 7 counties in Oklahoma; 32 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 19, 2020, 1:58 PM CDT for 15 counties in Arkansas; 7 counties in Oklahoma; 32 counties in Texas. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Mar 19, 2020, 1:58 PM CDT (18:58 UTC)
Expired
Mar 19, 2020, 3:00 PM CDT
In force
62 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 54 counties

Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Little River County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Yell County, AR, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Bosque County, TX, Bowie County, TX, Camp County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 203 km from the middle of the area, began a volume at 18:59 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

Norman, OK (KOUN), launched 12:00Z, 7.0 hours before the alert went out and 249 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, Norman, OK at 12:00Z on 2020-03-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 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, Norman, OK at 12:00Z on 2020-03-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 418 square meters per square second.1939587897Sfc1 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
18 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
418 m²/s²
0-3 km storm-relative helicity
496 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Mar 19, 11:05 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clay, Cleburne and 21 more115 min
Mar 19, 2:24 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 48 more8 hr
Mar 19, 3:40 PM CDTMesoscale DiscussionSPCClay, Randolph65 min
Mar 19, 6:06 PM CDTMesoscale DiscussionSPCFranklin, Johnson, Logan, Newton, Polk, Pope and 3 more84 min
Mar 19, 3:23 AM CDTMesoscale DiscussionSPCCleveland, Garvin, Grady, McClain, Murray, Oklahoma and 4 more2 hr
Mar 18, 8:45 PM CDTMesoscale DiscussionSPCBandera, Coke, Concho, Crockett, Edwards, Irion and 18 more60 min
Mar 18, 9:34 PM CDTMesoscale DiscussionSPCCooke, Grayson, Wise56 min
Mar 18, 11:37 PM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 34 more5 hr
Mar 19, 1:28 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 23 more2 hr
Mar 19, 2:08 AM CDTMesoscale DiscussionSPCShackelford, Stephens67 min
Mar 19, 3:33 AM CDTMesoscale DiscussionSPCBandera, Brown, Callahan, Coleman, Comanche, Concho and 24 more117 min
Mar 19, 6:51 PM CDTMesoscale DiscussionSPCBell, Bosque, Coryell, Falls, Freestone, Hamilton and 9 more54 min

Nearby

Mesoscale Discussions in Texas, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Oklahoma, 2020Every mesoscale discussion in 2020

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.