Alert archive / Louisiana / Mesoscale Discussions in 2017

Mesoscale Discussion 1598

August 30, 2017Baldwin County, Mobile County, Alabama; 6 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Aug 30, 2017, 1:00 AM CDT for Baldwin County, Mobile County, Alabama; 6 parishes in Louisiana; 6 counties in Mississippi. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Aug 30, 2017, 1:00 AM CDT (06:00 UTC)
Expired: Aug 30, 2017, 2:30 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Baldwin County, AL, Mobile County, AL, Orleans Parish, LA, Saint Bernard Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.0 hours before the alert went out and 33 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: 356 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 520 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 357 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

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
Aug 30, 6:57 AM CDT	Mesoscale Discussion	SPC	Baldwin	2 hr
Aug 30, 10:22 AM CDT	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	8 hr
Aug 30, 12:10 PM CDT	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston, Russell	2 hr
Aug 30, 12:36 PM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Mobile, Washington	114 min
Aug 30, 2:55 PM CDT	Mesoscale Discussion	SPC	Choctaw, Sumter, Washington	2 hr
Aug 30, 9:51 AM CDT	Mesoscale Discussion	SPC	Catahoula, Concordia, East Feliciana, Franklin, LaSalle, Saint Helena and 4 more	114 min
Aug 30, 5:50 PM CDT	Mesoscale Discussion	SPC	Avoyelles, Catahoula, Concordia, East Carroll, East Feliciana, Franklin and 8 more	55 min

Nearby

Mesoscale Discussions in Louisiana, 2017 Mesoscale Discussions in Mississippi, 2017 Mesoscale Discussions in Alabama, 2017 Every mesoscale discussion in 2017

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.