Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 285, NWS New Orleans, LA

October 25, 1997Livingston Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Oct 25, 1997, 12:22 PM CDT for Livingston Parish, Tangipahoa Parish, Louisiana. It was in force for 68 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
Oct 25, 1997, 12:22 PM CDT (17:22 UTC)
Expired
Oct 25, 1997, 1:30 PM CDT
In force
68 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Livingston Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.4 hours before the alert went out and 89 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 12:00Z on 1997-10-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2541 joules per kilogram.LCLEL10008507005003002001001 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 12:00Z on 1997-10-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 174 square meters per square second.1939587897117Sfc1 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
2541 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
174 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
2.2
Supercell composite
12.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 251723 RRA
SVRNEW
LAC063-105-251830-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1222 PM CDT SAT OCT 25 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  130 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...TANGIPAHOA PARISH
 
AT 1220 CDT SLIDELL RADAR INDICATED A STRONG THUNDERSTORM MOVING INTO
SOUTHERN TANGIPAHOA PARISH. THIS STORM WAS MOVING TO THE NORTHEAST AT 30
MPH.
 
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
DON'T 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, Oct 25, 10:11 AM CDT, 2 hours 11 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-261500-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SAT OCT 25 1997

THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA IS FORECASTING AN
OUTBREAK OF SEVERE THUNDERSTORMS AND TORNADOES ACROSS MOST OF THE LOWER
MISSISSIPPI VALLEY THIS AFTERNOON AND TONIGHT..

AN UPPER AIR TROUGH IS MOVING EASTWARD INTO TEXAS. STRONG LOW LEVEL
FLOW OFF THE GULF OF MEXICO IS BRING IN WARM MOIST UNSTABLE AIR INTO
THE REGION. A STRONG JET REMAINS IN PLACE OVER THE CENTRAL GULF COAST.
AS THE UPPER AIR TROUGH APPROACHES A FEW SEVERE THUNDERSTORMS ARE
EXPECTED TO DEVELOP ACROSS SOUTHEAST LOUISIANA AND PORTIONS OF
SOUTHWEST MISSISSIPPI AND THE MISSISSIPPI GULF COAST.

PERSONS IN THE THREATENED AREAS ARE URGED TO REVIEW SEVERE WEATHER
SAFETY RULES AND TUNE IN TO NOAA WEATHER RADIO...LOCAL RADIO AND TV
STATIONS...CABLE OUTLETS...OR CONTACT OUT INTERNET HOMEPAGE AT
HTTP://WWW.SRH4.NOAA.GOV UNDER "FORECAST OFFICES" FOR FURTHER
INFORMATION ON CURRENT WEATHER CONDITIONS.

23
Special weather statement, Oct 25, 11:00 AM CDT, 1 hour 22 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-261500-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SAT OCT 25 1997

THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA IS FORECASTING AN
OUTBREAK OF SEVERE THUNDERSTORMS AND TORNADOES ACROSS MOST OF THE LOWER
MISSISSIPPI VALLEY THIS AFTERNOON AND TONIGHT..

AN UPPER AIR TROUGH IS MOVING EASTWARD INTO TEXAS. STRONG LOW LEVEL
FLOW OFF THE GULF OF MEXICO IS BRING IN WARM MOIST UNSTABLE AIR INTO
THE REGION. A STRONG JET REMAINS IN PLACE OVER THE CENTRAL GULF COAST.
AS THE UPPER AIR TROUGH APPROACHES A FEW SEVERE THUNDERSTORMS ARE
EXPECTED TO DEVELOP ACROSS SOUTHEAST LOUISIANA AND PORTIONS OF
SOUTHWEST MISSISSIPPI AND THE MISSISSIPPI GULF COAST.

PERSONS IN THE THREATENED AREAS ARE URGED TO REVIEW SEVERE WEATHER
SAFETY RULES AND TUNE IN TO NOAA WEATHER RADIO...LOCAL RADIO AND TV
STATIONS...CABLE OUTLETS...OR CONTACT OUT INTERNET HOMEPAGE AT
HTTP://WWW.SRH.NOAA.GOV UNDER FORECAST OFFICES FOR FURTHER
INFORMATION ON CURRENT WEATHER CONDITIONS.

23

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 25, 1:08 PM CDTSevere Thunderstorm WarningLIXSaint Tammany67 min
Oct 25, 1:30 PM CDTSevere Thunderstorm WarningLIXWashington30 min
Oct 25, 1:30 PM CDTSevere Thunderstorm WarningLIXLivingston30 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1997Every severe thunderstorm warning in 1997

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.