Alert archive / Mississippi / Mesoscale Discussions in 2025

Mesoscale Discussion 1012

May 27, 20254 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2025, 4:44 PM CDT for 4 states. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: May 27, 2025, 4:44 PM CDT (21:44 UTC)
Expired: May 27, 2025, 6:15 PM CDT
In force: 91 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

All 27 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Saint Tammany Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 77 km from the middle of the area, began a volume at 21:44 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.

Severe Thunderstorm Watch 339May 27, 5:05 PM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.7 hours before the alert went out and 144 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: 2607 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 647 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 87 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
May 27, 8:55 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 27 more	95 min
May 27, 12:08 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 24 more	97 min
May 27, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 9 more	6 hr
May 27, 2:25 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Coffee, Crenshaw, Dale and 7 more	95 min
May 27, 3:39 PM CDT	Mesoscale Discussion	SPC	Henry, Houston	96 min
May 27, 5:06 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Choctaw, Clarke, Conecuh, Dallas, Escambia and 9 more	6 hr
May 27, 3:34 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more	86 min
May 27, 4:54 AM CDT	Mesoscale Discussion	SPC	Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 24 more	96 min
May 27, 5:05 AM CDT	Severe Thunderstorm Watch	SPC	Ascension, Assumption, Catahoula, Concordia, East Baton Rouge, East Feliciana and 14 more	8 hr

Nearby

Mesoscale Discussions in Mississippi, 2025 Mesoscale Discussions in Alabama, 2025 Mesoscale Discussions in Louisiana, 2025 Every 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.