Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 7, NWS New Orleans, LA

January 12, 1998Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jan 12, 1998, 7:12 AM CST for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 63 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 12, 1998, 7:12 AM CST (13:12 UTC)
Expired: Jan 12, 1998, 8:15 AM CST
In force: 63 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jan 12, 7:30 AM CST	Thunderstorm Wind	Hammond, LA

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 12:00Z, 1.2 hours before the alert went out and 55 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: 265 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 499 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 411 m²/s²
0-3 km storm-relative helicity: 492 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

081 
WUUS1 KNEW 121313 RRA
SVRNEW
LAC103-105-121415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
712 AM CST MON JAN 12 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN LOUISIANA

   ...TANGIPAHOA PARISH
   ...ST TAMMANY PARISH

AT 710 AM CST WEATHER SERVICE RADAR SHOWED A SEVERE THUNDERSTORM
ABOUT 8 MILES NORTHEAST OF HAMMOND MOVING TO THE NORTHEAST AT 30
MILES AN HOUR. THE STORM WILL BE MOVING TOWARDS FOLSOM IN NORTHERN
ST TAMMANY PARISH BY 8AM.

THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 12, 2:43 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	62 min
Jan 12, 4:46 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee	74 min
Jan 12, 6:33 AM CST	Severe Thunderstorm Warning	LIX	East Baton Rouge, Livingston	62 min
Jan 12, 7:41 AM CST	Severe Thunderstorm Warning	LIX	Tangipahoa	119 min
Jan 12, 8:03 AM CST	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa	3 hr
Jan 12, 8:46 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	59 min
Jan 12, 10:50 AM CST	Tornado Warning	LIX	Orleans	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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.