Alert archive / Texas / Mesoscale Discussions in 2019

Mesoscale Discussion 199

March 13, 20196 counties in Arkansas; 29 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2019, 11:30 PM CDT for 6 counties in Arkansas; 29 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Mar 13, 2019, 11:30 PM CDT (04:30 UTC)
Expired
Mar 14, 2019, 2:00 AM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 35 counties

Hempstead County, AR, Howard County, AR, Little River County, AR, Miller County, AR, Pike County, AR, Sevier County, AR, Anderson County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Falls County, TX, Franklin County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Kaufman County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Robertson County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 155 km from the middle of the area, began a volume at 04:33 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

Shreveport, LA (KBAD), launched 00:00Z, 4.5 hours before the alert went out and 163 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, Shreveport, LA at 00:00Z on 2019-03-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Shreveport, LA at 00:00Z on 2019-03-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 285 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
3 J/kg
Mixed-layer CIN
-323 J/kg
Mixed-layer LCL
683 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
285 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

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 14, 1:59 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more5 hr
Mar 14, 4:07 AM CDTMesoscale DiscussionSPCColumbia, Hempstead, Lafayette, Miller, Nevada83 min
Mar 14, 4:47 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 19 more88 min
Mar 14, 5:28 AM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clay and 24 more7 hr
Mar 14, 7:14 AM CDTMesoscale DiscussionSPCArkansas, Chicot, Clay, Craighead, Crittenden, Cross and 12 more2 hr
Mar 14, 5:52 AM CDTMesoscale DiscussionSPCJasper, Newton, Sabine, San Augustine, Tyler53 min

Nearby

Mesoscale Discussions in Texas, 2019Mesoscale Discussions in Arkansas, 2019Every mesoscale discussion in 2019

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.