Alert archive / Mississippi / Mesoscale Discussions in 2019

Mesoscale Discussion 2115

October 25, 20194 states

The Storm Prediction Center issued this mesoscale discussion at Oct 25, 2019, 8:53 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Oct 25, 2019, 8:53 AM CDT (13:53 UTC)
Expired: Oct 25, 2019, 11:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Baldwin County, AL, Mobile County, AL, Escambia County, FL, Plaquemines Parish, LA, Saint Bernard Parish, LA, George County, MS, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 93 km from the middle of the area, began a volume at 13:57 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 683Oct 25, 9:50 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.9 hours before the alert went out and 96 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: 376 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 528 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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
Oct 25, 9:49 AM CDT	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	6 hr
Oct 25, 12:06 PM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Mobile, Washington	114 min
Oct 25, 3:03 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Marengo, Mobile, Monroe and 1 more	57 min
Oct 25, 3:43 PM CDT	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	7 hr
Oct 25, 5:14 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	91 min
Oct 25, 6:50 AM CDT	Mesoscale Discussion	SPC	Plaquemines	55 min

Nearby

Mesoscale Discussions in Mississippi, 2019 Mesoscale Discussions in Alabama, 2019 Mesoscale Discussions in Louisiana, 2019 Every mesoscale discussion in 2019

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.