Alert archive / Louisiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2194

August 31, 20084 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2008, 11:54 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 31, 2008, 11:54 PM CDT (04:54 UTC)
Expired: Sep 1, 2008, 2:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 43 counties

Baldwin County, AL, Mobile County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 87 km from the middle of the area, began a volume at 04:55 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.9 hours before the alert went out and 129 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: 838 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1135 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 31, 7:47 PM CDT	Mesoscale Discussion	SPC	Baldwin, Mobile	88 min
Aug 31, 8:49 PM CDT	Tornado Watch	SPC	Baldwin, Mobile	10 hr
Sep 1, 3:51 AM CDT	Mesoscale Discussion	SPC	Baldwin, Mobile	114 min
Sep 1, 6:30 AM CDT	Tornado Watch	SPC	Baldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more	9 hr
Sep 1, 9:49 AM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Conecuh, Escambia, Mobile, Monroe and 1 more	86 min
Sep 1, 3:51 PM CDT	Tornado Watch	SPC	Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more	8 hr
Sep 1, 6:28 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more	2 hr

Nearby

Mesoscale Discussions in Louisiana, 2008 Mesoscale Discussions in Florida, 2008 Mesoscale Discussions in Mississippi, 2008 Every mesoscale discussion in 2008

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.