Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 101, NWS New Orleans, LA

March 7, 1998Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 7, 1998, 5:44 PM CST for Terrebonne Parish, Louisiana. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 7, 1998, 5:44 PM CST (23:44 UTC)
Expired: Mar 7, 1998, 6:45 PM CST
In force: 61 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Terrebonne Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 7, 1:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.7 hours before the alert went out and 150 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: 520 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 325 m²/s²
0-3 km storm-relative helicity: 480 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

081 
WUUS1 KNEW 072342 RRA
SVRNEW
LAC109-080045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
544 PM CST SAT MAR 7 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN LOUISIANA

   ...TERREBONNE PARISH

NATIONAL WEATHER SERVICE RADAR INDICATED A CLUSTER OF SEVERE
THUNDERSTORMS LOCATED ABOUT 30 MILES SOUTHWEST OF HOUMA. THESE
STORMS WERE MOVING NORTHEAST AT 50 MPH. THESE STORMS WILL EFFECT
HOUMA OVER THE NEXT H0UR. LARGE HAIL IS POSSIBLE WITH THIS CLUSTER.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 7, 3:51 AM CST	Severe Thunderstorm Warning	LIX	Washington	59 min
Mar 7, 4:19 AM CST	Severe Thunderstorm Warning	LIX	Livingston	36 min
Mar 7, 4:24 AM CST	Tornado Warning	LIX	Saint Tammany	31 min
Mar 7, 4:56 AM CST	Tornado Warning	LIX	Ascension, Iberville	34 min
Mar 7, 5:07 AM CST	Tornado Warning	LIX	Saint Tammany	33 min
Mar 7, 5:51 AM CST	Severe Thunderstorm Warning	LIX	Saint James	34 min
Mar 7, 6:41 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	44 min
Mar 7, 8:10 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	35 min
Mar 7, 4:14 PM CST	Severe Thunderstorm Warning	LIX	Assumption	61 min
Mar 7, 4:20 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	30 min
Mar 7, 4:41 PM CST	Flash Flood Warning	LIX	Saint Bernard	4 hr
Mar 7, 4:46 PM CST	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	34 min
Mar 7, 5:00 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	35 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1998 Every severe thunderstorm warning 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.