Alert archive / Louisiana / Mesoscale Discussions in 2023

Mesoscale Discussion 97

January 24, 202315 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Jan 24, 2023, 3:43 PM CST for 15 parishes in Louisiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jan 24, 2023, 3:43 PM CST (21:43 UTC)
Expired: Jan 24, 2023, 5:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch likely
Chance of a watch: 80%

Counties Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA

The radar

The Lake Charles radar (KLCH), 128 km from the middle of the area, began a volume at 21:47 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.

Tornado Watch 28Jan 24, 5:25 PM CST

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.7 hours before the alert went out and 126 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: 744 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 395 m²/s²
0-3 km storm-relative helicity: 502 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
Jan 24, 10:16 AM CST	Mesoscale Discussion	SPC	Calcasieu, Cameron	119 min
Jan 24, 10:49 AM CST	Tornado Watch	SPC	Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis	7 hr
Jan 24, 5:25 PM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, East Baton Rouge, East Feliciana and 25 more	7 hr

Nearby

Mesoscale Discussions in Louisiana, 2023 Every mesoscale discussion in 2023

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.