Alert archive / Louisiana / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 42
The Storm Prediction Center issued this severe thunderstorm watch at Mar 13, 2003, 10:45 AM CST for 18 parishes in Louisiana; Hancock County, Harrison County, Mississippi. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2003, 10:45 AM CST (16:45 UTC)
- Expired
- Mar 13, 2003, 4:00 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, West Baton Rouge Parish, LA, Hancock County, MS, Harrison County, MS
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 12:16 PM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Saint Helena, Tangipahoa | 59 min |
| Mar 13, 12:59 PM CST | Severe Thunderstorm Warning | LIX | Tangipahoa, Washington | 46 min |
| Mar 13, 1:15 PM CST | Severe Thunderstorm Warning | LIX | Livingston, Tangipahoa | 45 min |
| Mar 13, 1:48 PM CST | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa | 42 min |
| Mar 13, 2:16 PM CST | Severe Thunderstorm Warning | LIX | Hancock, Pearl River | 59 min |
| Mar 13, 2:29 PM CST | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Saint Tammany | 61 min |
| Mar 13, 2:58 PM CST | Severe Thunderstorm Warning | LIX | Plaquemines, Saint Bernard | 62 min |
| Mar 13, 3:06 PM CST | Severe Thunderstorm Warning | LIX | Hancock, Harrison | 54 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 12:00Z, 4.8 hours before the alert went out and 121 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.
- Mixed-layer CAPE
- 797 J/kg
- Mixed-layer CIN
- -157 J/kg
- Mixed-layer LCL
- 711 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 209 m²/s²
- 0-3 km storm-relative helicity
- 247 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 7:52 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 8 more | 113 min |
| Mar 13, 8:30 AM CST | Severe Thunderstorm Watch | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 7 more | 6 hr |
| Mar 13, 8:50 AM CST | Severe Thunderstorm Watch | SPC | Avoyelles, Catahoula, Concordia, East Carroll, Franklin, Madison and 1 more | 5 hr |
| Mar 13, 10:53 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 5 more | 2 hr |
| Mar 13, 11:29 AM CST | Mesoscale Discussion | SPC | Catahoula, Concordia, East Carroll, Madison, Tensas | 2 hr |
| Mar 13, 1:26 PM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Livingston, Orleans and 5 more | 2 hr |
| Mar 13, 2:15 PM CST | Mesoscale Discussion | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard | 2 hr |
| Mar 13, 3:53 PM CST | Mesoscale Discussion | SPC | Beauregard, Calcasieu | 2 hr |
| Mar 13, 9:39 AM CST | Mesoscale Discussion | SPC | Clarke, Forrest, George, Greene, Hancock, Harrison and 11 more | 2 hr |
| Mar 13, 10:10 AM CST | Severe Thunderstorm Watch | SPC | Clarke, Forrest, George, Greene, Jasper, Jones and 6 more | 6 hr |
| Mar 13, 12:59 PM CST | Mesoscale Discussion | SPC | Clarke, Greene, Jones, Kemper, Lauderdale, Noxubee and 2 more | 2 hr |
| Mar 13, 3:10 PM CST | Severe Thunderstorm Watch | SPC | George, Greene, Harrison, Jackson, Pearl River, Perry and 1 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2003Severe Thunderstorm Watches in Mississippi, 2003Every severe thunderstorm watch in 2003
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.