Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 239, NWS New Orleans, LA

November 10, 1998Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 10, 1998, 1:07 PM CST for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 63 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: Nov 10, 1998, 1:07 PM CST (19:07 UTC)
Expired: Nov 10, 1998, 2:10 PM CST
In force: 63 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa 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
Nov 10, 11:15 AM CST	Tornado Watch	SPC	5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.1 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: 967 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 344 m²/s²
0-3 km storm-relative helicity: 471 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

212 
WUUS1 KNEW 101905 RRA
SVRNEW
LAC103-105-102010-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
107 PM CST TUE NOV 10 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A...

* SEVERE THUNDERSTORM WARNING FOR
   - SOUTHERN TANGIPAHOA PARISH IN SOUTHEASTERN LOUISIANA
   - ST TAMMANY PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 210 PM CST

* AT 105 PM CST... DOPPLER RADAR INDICATED A CLUSTER OF SEVERE
THUNDERSTORMS CENTERED 15 MILES WEST OF COVINGTON...MOVING EAST AT
40 MILES AN HOUR.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  COVINGTON AROUND 120 PM.
  MANDEVILLE AROUND 120 PM.

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.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Nov 10, 10:20 AM CST, 2 hours 47 minutes before

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-111600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1020 AM CST TUE NOV 10 1998

STRONG COLD FRONT MOVING ACROSS THE LOCAL REGION WILL PRODUCE
THUNDERSTORMS. SOME OF THESE THUNDERSTORMS WILL BE SEVERE IN
SOUTHEAST LOUISIANA AND SOUTHWEST MISSISSIPPI THROUGH THIS AFTERNOON
WITH FREQUENT LIGHTNINGS...POTENTIAL DAMAGING WINDS AND SMALL HAIL.
THE STORM WILL CONTINUE TO MOVE EAST AND AFFECT COASTAL MISSISSIPPI
THROUGH THE EVENING HOURS. THE ATMOSPHERIC CONDITIONS OVER THE
REGION WILL STABILIZE BY LATE TONIGHT AS THE COLD FRONT IS EXPECTED
TO MOVE OUT FROM THE LOCAL AREAS.

OUR WEB SITE PROVIDES MORE WEATHER INFORMATION AT:
HTTP://WWW.SRH.NOAA.GOV/LIX (ALL LOWER CASE)

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 10, 10:29 AM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	46 min
Nov 10, 11:03 AM CST	Severe Thunderstorm Warning	LIX	Tangipahoa	47 min
Nov 10, 11:18 AM CST	Severe Thunderstorm Warning	LIX	Iberville	47 min
Nov 10, 11:24 AM CST	Severe Thunderstorm Warning	LIX	Washington	46 min
Nov 10, 11:39 AM CST	Tornado Warning	LIX	Washington	31 min
Nov 10, 12:00 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa	35 min
Nov 10, 12:14 PM CST	Tornado Warning	LIX	Washington	36 min
Nov 10, 1:59 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	46 min
Nov 10, 2:07 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	48 min
Nov 10, 3:12 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	48 min
Nov 10, 3:27 PM CST	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	33 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.