Alert archive / Louisiana / Mesoscale Discussions in 2025

Mesoscale Discussion 99

February 15, 20259 parishes in Louisiana; Issaquena County, Sharkey County, Warren County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 15, 2025, 5:49 PM CST for 9 parishes in Louisiana; Issaquena County, Sharkey County, Warren County, Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued
Feb 15, 2025, 5:49 PM CST (23:49 UTC)
Expired
Feb 15, 2025, 7:15 PM CST
In force
86 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 8

Counties Caldwell Parish, LA, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Issaquena County, MS, Sharkey County, MS, Warren County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 158 km from the middle of the area, began a volume at 23:51 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 12:00Z, 11.8 hours before the alert went out and 197 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 12:00Z on 2025-02-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 177 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 12:00Z on 2025-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 510 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
177 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
447 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
510 m²/s²
0-3 km storm-relative helicity
577 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.4

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
Feb 15, 1:06 PM CSTMesoscale DiscussionSPCBienville, Bossier, Claiborne, De Soto, Lincoln, Red River and 2 more3 hr
Feb 15, 4:00 PM CSTTornado WatchSPCAvoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 23 more7 hr

Nearby

Mesoscale Discussions in Louisiana, 2025Mesoscale Discussions in Mississippi, 2025Every mesoscale discussion in 2025

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.