Alert archive / Texas / Mesoscale Discussions in 2022

Mesoscale Discussion 270

March 17, 20224 counties in Arkansas; 10 parishes in Louisiana; 11 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Mar 17, 2022, 8:30 PM CDT for 4 counties in Arkansas; 10 parishes in Louisiana; 11 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 17, 2022, 8:30 PM CDT (01:30 UTC)
Expired: Mar 17, 2022, 10:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

All 25 counties

Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 6 km from the middle of the area, began a volume at 01:30 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 (KSHV), launched 00:00Z, 1.5 hours before the alert went out and 12 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1826 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 301 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.

Issued	Product	Office	Counties	Lasted
Mar 18, 11:50 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Craighead, Fulton, Greene, Independence and 6 more	85 min
Mar 18, 3:04 PM CDT	Mesoscale Discussion	SPC	Clay	116 min
Mar 17, 10:47 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 19 more	3 hr
Mar 17, 11:42 PM CDT	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 23 more	7 hr
Mar 18, 1:40 AM CDT	Mesoscale Discussion	SPC	East Baton Rouge, Evangeline, Pointe Coupee, Saint Landry, West Baton Rouge, West Feliciana	95 min
Mar 18, 3:12 AM CDT	Mesoscale Discussion	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Pointe Coupee and 7 more	2 hr
Mar 18, 3:55 AM CDT	Tornado Watch	SPC	Saint Tammany, Washington	8 hr
Mar 18, 5:48 AM CDT	Mesoscale Discussion	SPC	Washington	87 min

Nearby

Mesoscale Discussions in Texas, 2022 Mesoscale Discussions in Louisiana, 2022 Mesoscale Discussions in Arkansas, 2022 Every mesoscale discussion in 2022

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.