Alert archive / Louisiana / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 355

May 30, 200519 parishes in Louisiana; Hancock County, Pearl River County, Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2005, 2:25 AM CDT for 19 parishes in Louisiana; Hancock County, Pearl River County, Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2005, 2:25 AM CDT (07:25 UTC)
Expired: May 30, 2005, 7:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 21 counties

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, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Hancock County, MS, Pearl River County, MS

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 30, 2:42 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, West Baton Rouge, West Feliciana	48 min
May 30, 3:46 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Iberville	29 min
May 30, 5:39 AM CDT	Tornado Warning	LIX	Saint Tammany	51 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.4 hours before the alert went out and 95 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: 26 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 1335 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 10:53 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Beauregard, Calcasieu and 14 more	37 min
May 29, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Acadia, Allen, Calcasieu, Cameron, Evangeline, Iberia and 4 more	6 hr
May 30, 1:33 AM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 12 more	87 min
May 30, 4:35 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 12 more	85 min
May 30, 6:17 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 12 more	58 min
May 30, 1:48 PM CDT	Mesoscale Discussion	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 9 more	117 min

Nearby

Severe Thunderstorm Watches in Louisiana, 2005 Severe Thunderstorm Watches in Mississippi, 2005 Every severe thunderstorm watch in 2005

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.