Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 201, NWS New Orleans, LA

July 12, 1997East Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 12, 1997, 2:54 PM CDT for East Baton Rouge Parish, Louisiana. It was in force for 66 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
Jul 12, 1997, 2:54 PM CDT (19:54 UTC)
Expired
Jul 12, 1997, 4:00 PM CDT
In force
66 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County East Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.9 hours before the alert went out and 138 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 1997-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2495 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 12:00Z on 1997-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -46 square meters per square second.1939Sfc1 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
2495 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-46 m²/s²
0-3 km storm-relative helicity
-20 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 121954 RRA
SVRNEW
LAC033-122100-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
254 PM CDT SAT JUL 12 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  400 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...EAST BATON ROUGE PARISH
 
AT 255 PM NATIONAL WEATHER SERVICE RADAR IN SLIDELL INDICATED A SEVERE
THUNDERSTOREM FORMING OVER NORTHEAST PORTION OF EAST BATON ROUGE
PARISH NEAR THE TOWN OF PRIDE. THE STORM IS MOVING TOWARDS THE
SOUTHWEST AT 5 TO 10 MPH.  EXPECT STRONG GUSTY WINDS...HEAVY RAINFALL
OF UP TO 2.5 INCHES PER HOUR AND POSSIBLE SMALL HAIL.
 
 
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 QUICK(LY 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, Jul 12, 10:18 AM CDT, 4 hours 36 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-121600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SAT JUL 12 1997

AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT
IS OVER THE AREA. DRIER AIR ALOFT IS MOVING WESTWARD INTO SOUTHEAST
LOUISIANA. AIR MASS REMAINS UNSTABLE AND VERY MOIST. EXPECT
THUNDERSTORMS TO BEGIN TO FIRE EARLY IN THE AFTERNOON. A FEW COULD
REACH SEVERE LIMITS WITH WINDS AROUND 60 MPH AND SMALL HAIL. THE
ACTIVITY SHOULD BEGIN TO DECREASE DURING THE LATE AFTERNOON EARLY
EVENING HOURS. MOVEMENT OF STORMS WILL GENERALLY BE SOUTHERLY AT 10 MPH
Special weather statement, Jul 12, 11:00 AM CDT, 3 hours 54 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-121600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SAT JUL 12 1997

AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT
IS OVER THE AREA. DRIER AIR ALOFT IS MOVING WESTWARD INTO SOUTHEAST
LOUISIANA. AIR MASS REMAINS UNSTABLE AND VERY MOIST. EXPECT
THUNDERSTORMS TO BEGIN TO FIRE EARLY IN THE AFTERNOON. A FEW COULD
REACH SEVERE LIMITS WITH WINDS AROUND 60 MPH AND SMALL HAIL. THE
ACTIVITY SHOULD BEGIN TO DECREASE DURING THE LATE AFTERNOON EARLY
EVENING HOURS. MOVEMENT OF STORMS WILL GENERALLY BE SOUTHERLY AT 10 MPH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 1:42 PM CDTSevere Thunderstorm WarningLIXSaint Helena63 min
Jul 12, 2:10 PM CDTSevere Thunderstorm WarningLIXLivingston65 min
Jul 12, 2:36 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa69 min
Jul 12, 3:16 PM CDTSevere Thunderstorm WarningLIXTerrebonne59 min
Jul 12, 3:31 PM CDTSevere Thunderstorm WarningLIXSaint Helena59 min
Jul 12, 4:09 PM CDTSevere Thunderstorm WarningLIXSaint James, Saint John the Baptist36 min
Jul 12, 5:32 PM CDTSevere Thunderstorm WarningLIXJefferson, Plaquemines28 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.