Alert archive / Louisiana / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 155

April 11, 1997Baldwin County, Mobile County, Alabama; 13 parishes in Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 11, 1997, 10:15 AM CDT for Baldwin County, Mobile County, Alabama; 13 parishes in Louisiana; 6 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 11, 1997, 10:15 AM CDT (15:15 UTC)
Expired: Apr 11, 1997, 3:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 21 counties

Baldwin County, AL, Mobile County, AL, Ascension Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 11, 10:27 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche	48 min
Apr 11, 10:45 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles	45 min
Apr 11, 11:09 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines	66 min
Apr 11, 11:09 AM CDT	Severe Thunderstorm Warning	LIX	Saint Bernard	66 min
Apr 11, 11:26 AM CDT	Tornado Warning	LIX	Jefferson, Lafourche	34 min
Apr 11, 11:31 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa	44 min
Apr 11, 11:49 AM CDT	Tornado Warning	LIX	Saint Tammany, Tangipahoa	26 min
Apr 11, 12:12 PM CDT	Tornado Warning	LIX	Saint Tammany, Tangipahoa	33 min
Apr 11, 12:17 PM CDT	Severe Thunderstorm Warning	LIX	Orleans, Plaquemines, Saint Bernard	43 min
Apr 11, 12:59 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	46 min
Apr 11, 2:48 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	42 min

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 3.3 hours before the alert went out and 257 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1830 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 11, 3:00 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Coffee, Conecuh, Covington, Dale, Escambia and 6 more	6 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 1997 Severe Thunderstorm Watches in Mississippi, 1997 Severe Thunderstorm Watches in Alabama, 1997 Every severe thunderstorm watch in 1997

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.