Alert archive / Louisiana / Tornado Watches in 1998

Tornado Watch 826

September 12, 199842 parishes in Louisiana; 9 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Sep 12, 1998, 9:45 AM CDT for 42 parishes in Louisiana; 9 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Sep 12, 1998, 9:45 AM CDT (14:45 UTC)
Expired: Sep 12, 1998, 4:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 51 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Natchitoches Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS, Lincoln County, MS, Pike County, MS, Walthall County, MS, Wilkinson 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
Sep 12, 11:03 AM CDT	Flash Flood Warning	LIX	Saint Tammany	3 hr
Sep 12, 11:03 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	3 hr
Sep 12, 11:03 AM CDT	Flash Flood Warning	SHV	Sabine	4 hr
Sep 12, 11:15 AM CDT	Flash Flood Warning	SHV	Natchitoches	4 hr
Sep 12, 1:04 PM CDT	Tornado Warning	LCH	Rapides	61 min
Sep 12, 1:28 PM CDT	Flash Flood Warning	LIX	Plaquemines	3 hr
Sep 12, 1:38 PM CDT	Flash Flood Warning	SHV	Grant, Winn	4 hr
Sep 12, 2:27 PM CDT	Flash Flood Warning	LCH	Evangeline	2 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.8 hours before the alert went out and 170 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: 5 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 884 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 424 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.

Nearby

Tornado Watches in Louisiana, 1998 Tornado Watches in Mississippi, 1998 Every tornado watch in 1998

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.