Alert archive / Mississippi / Mesoscale Discussions in 2023

Mesoscale Discussion 101

January 24, 20235 parishes in Louisiana; 8 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 24, 2023, 10:12 PM CST for 5 parishes in Louisiana; 8 counties in Mississippi. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jan 24, 2023, 10:12 PM CST (04:12 UTC)
Expired
Jan 24, 2023, 11:45 PM CST
In force
93 min
Issued by
the Storm Prediction Center
Concerning
Tornado watch 28...29

Counties Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Forrest County, MS, Hancock County, MS, Harrison County, MS, Jones County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.2 hours before the alert went out and 2 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, Slidell Radar S, LA at 00:00Z on 2023-01-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Slidell Radar S, LA at 00:00Z on 2023-01-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 805 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
550 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
805 m²/s²
0-3 km storm-relative helicity
1093 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

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
Jan 24, 6:11 PM CSTMesoscale DiscussionSPCAcadia, Avoyelles, Iberia, Iberville, Lafayette, Pointe Coupee and 6 more2 hr
Jan 24, 8:18 PM CSTMesoscale DiscussionSPCForrest, George, Hancock, Harrison, Jackson, Perry and 1 more87 min
Jan 24, 9:32 PM CSTTornado WatchSPCForrest, George, Greene, Hancock, Harrison, Jackson and 7 more8 hr

Nearby

Mesoscale Discussions in Mississippi, 2023Mesoscale Discussions in Louisiana, 2023Every 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.