Alert archive / Louisiana / Mesoscale Discussions in 2019

Mesoscale Discussion 203

March 14, 201915 parishes in Louisiana; 5 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 14, 2019, 5:52 AM CDT for 15 parishes in Louisiana; 5 counties in Texas. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Mar 14, 2019, 5:52 AM CDT (10:52 UTC)
Expired: Mar 14, 2019, 6:45 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, Winn Parish, LA, Jasper County, TX, Newton County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 72 km from the middle of the area, began a volume at 10:54 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

Shreveport, LA (KBAD), launched 00:00Z, 10.9 hours before the alert went out and 100 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

Issued	Product	Office	Counties	Lasted
Mar 14, 1:59 AM CDT	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	5 hr
Mar 14, 4:07 AM CDT	Mesoscale Discussion	SPC	Bossier, Caddo, De Soto, Webster	83 min
Mar 13, 11:30 PM CDT	Mesoscale Discussion	SPC	Anderson, Bowie, Camp, Cass, Cherokee, Falls and 23 more	3 hr

Nearby

Mesoscale Discussions in Louisiana, 2019 Mesoscale Discussions in Texas, 2019 Every 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.