Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 2, NWS New Orleans, LA

January 7, 1998Saint Tammany Parish, Louisiana; Hancock County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Jan 7, 1998, 1:13 AM CST for Saint Tammany Parish, Louisiana; Hancock County, Mississippi. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jan 7, 1998, 1:13 AM CST (07:13 UTC)
Expired
Jan 7, 1998, 1:45 AM CST
In force
32 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Hancock County, MS

What was reported inside it

TimeReportWhereRemark
Jan 7, 1:45 AM CSTTornado F0Slidell, LAA tornado touched down briefly in the Ozone Woods subdivision snapping trees and downing power lines.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.2 hours before the alert went out and 17 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-pSkew-T log-p diagram, Slidell Radar S, LA at 00:00Z on 1998-01-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 00:00Z on 1998-01-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 319 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4 J/kg
Mixed-layer CIN
-252 J/kg
Mixed-layer LCL
768 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
319 m²/s²
0-3 km storm-relative helicity
407 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

843 
WUUS1 KNEW 070714 RRA
SVRNEW
GMZ530-555-LAC103-MSC045-070745-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
113 AM CST WED JAN 7 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 145 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHEASTERN LOUISIANA

   ...ST TAMMANY PARISH AND LAKE PONTCHARTRAIN

IN SOUTHERN MISSISSIPPI

   ...HANCOCK COUNTY AND ADJACENT COASTAL WATERS

AT 110 AM CST...DOPPLER RADAR IN SLIDELL INDICATED A CLUSTER OF
SEVERE THUNDERSTORMS OVER LAKE PONTCHARTAIN AND NEAR THE COAST OF
HANCOCK COUNTY MOVING NORTHEAST AT 40 MILES AN HOUR. DAMAGING WIND
GUSTS ARE EXPECTED WITH THESE STORMS AS THEY SPREAD ACROSS ST
TAMMANY PARISH AND HANCOCK COUNTY.



IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 6, 8:32 PM CSTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston4 hr
Jan 6, 8:32 PM CSTFlash Flood WarningLIXAssumption, Saint James4 hr
Jan 6, 8:32 PM CSTFlash Flood WarningLIXIberville, West Baton Rouge4 hr
Jan 6, 9:57 PM CSTFlash Flood WarningLIXEast Feliciana, Pointe Coupee, West Feliciana4 hr
Jan 6, 9:57 PM CSTFlash Flood WarningLIXSaint Helena, Tangipahoa4 hr
Jan 6, 11:19 PM CSTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard4 hr
Jan 6, 11:19 PM CSTFlash Flood WarningLIXLafourche, Saint Charles, Saint John the Baptist, Terrebonne4 hr
Jan 7, 1:31 AM CSTTornado WarningLIXSaint Tammany19 min
Jan 7, 1:42 AM CSTFlash Flood WarningLIXSaint Tammany3 hr
Jan 7, 5:09 AM CSTFlash Flood WarningLIXSaint Tammany116 min
Jan 6, 9:57 PM CSTFlash Flood WarningLIXPike4 hr
Jan 6, 9:57 PM CSTFlash Flood WarningLIXWilkinson4 hr
Jan 7, 3:42 AM CSTSevere Thunderstorm WarningLIXHarrison48 min
Jan 7, 4:25 AM CSTFlash Flood WarningLIXHarrison, Jackson3 hr
Jan 7, 7:30 AM CSTFlash Flood WarningLIXHarrison, Jackson90 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1998Severe Thunderstorm Warnings in Mississippi, 1998Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.