Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 210, NWS New Orleans, LA

July 13, 1997Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 13, 1997, 1:11 PM CDT for Saint Tammany Parish, Louisiana. It was in force for 64 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 13, 1997, 1:11 PM CDT (18:11 UTC)
Expired
Jul 13, 1997, 2:15 PM CDT
In force
64 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.2 hours before the alert went out and 30 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 1997-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1858 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 1997-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
1858 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
1023 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
2 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 131812 RRA
SVRNEW
LAC103-LAZ501-131915-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
111 PM CDT SUN JUL 13 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  215 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...SOUTH CENTRAL ST. TAMMANY PARISH
 
  AND FOR MARINE INTERESTS IN THE COASTAL WATERS AROUND...
 
  ...LAKE PONTCHARTRAIN
 
AT 110 PM NATIONAL WEATHER SERVICE RADAR IN SLIDEL INDICATED A SEVERE
THUNDERSTORM FORMING OVER SOUTH CENTRAL ST TAMMANY PARISH NEAR
COVINGTON AND ABITA SPRINGS. ANOTHER THUNDERSTORM WAS LOCATED OVER
MANDEVILLE EAST OF THE COUSEWAY BRIDGE. THESE STORMS ARE MOVING SOUTH
AT 5 TO 10 MPH.  HEAVY RAINFALL OF 2 TO 4 INCHES IS POSSIBLE ALONG WITH
STRONG GUSTY WINDS AND SMALL HAIL.
 
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FRO>M 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.

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 13, 11:00 AM CDT, 2 hours 11 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-141600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SUN JUL 13 1997

AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT
IS OVER THE AREA. AIR MASS HAS BECOME MORE UNSTABLE. WEAK IMPULSES
MOVING SOUTH DOWN THE BACK SIDE OF THE HIGH WILL ENHANCE CONVECTION.
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
OR LESS. THIS COULD RESULT IN LOCALLY HEAVY RAINFALL UNDER THE HEAVIER
STORMS.
Special weather statement, Jul 13, 12:25 PM CDT, 46 minutes before
LAZ034>040-046>049-056>070-MSZ068>071-080>082-141600-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT SUN JUL 13 1997

AREA REMAINS UNDER A RIDGE OF HIGH PRESSURE. GOOD DIFLUENT FLOW ALOFT
IS OVER THE AREA. AIR MASS HAS BECOME MORE UNSTABLE. WEAK IMPULSES
MOVING SOUTH DOWN THE BACK SIDE OF THE HIGH WILL ENHANCE CONVECTION.
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
OR LESS. THIS COULD RESULT IN LOCALLY HEAVY RAINFALL UNDER THE HEAVIER
STORMS.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 12:44 PM CDTSevere Thunderstorm WarningLIXJefferson, Plaquemines61 min
Jul 13, 1:48 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Plaquemines57 min
Jul 13, 2:20 PM CDTSevere Thunderstorm WarningLIXTangipahoa55 min
Jul 13, 2:53 PM CDTSevere Thunderstorm WarningLIXJefferson, Plaquemines67 min
Jul 13, 3:11 PM CDTSevere Thunderstorm WarningLIXWashington64 min
Jul 13, 3:22 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge68 min
Jul 13, 3:45 PM CDTSevere Thunderstorm WarningLIXTangipahoa60 min
Jul 13, 4:08 PM CDTSevere Thunderstorm WarningLIXAscension, Livingston52 min
Jul 13, 4:17 PM CDTSevere Thunderstorm WarningLIXLafourche, Terrebonne43 min
Jul 13, 4:23 PM CDTSevere Thunderstorm WarningLIXSaint Tammany52 min
Jul 13, 4:58 PM CDTSevere Thunderstorm WarningLIXIberville47 min
Jul 13, 5:10 PM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana50 min
Jul 13, 5:27 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington48 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.