Alert archive / Louisiana / Flash Flood Warnings in 1997

Flash Flood Warning 19, NWS New Orleans, LA

July 7, 1997Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 7, 1997, 1:40 PM CDT for Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 2 hr. 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 7, 1997, 1:40 PM CDT (18:40 UTC)
Expired: Jul 7, 1997, 3:45 PM CDT
In force: 2 hr
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.7 hours before the alert went out and 49 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: 924 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 49 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 071840
FFWNEW
LAC071-075-087-072045-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
140 PM CDT MON JUL 7 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING    EFFECTIVE UNTIL  345 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...ORLEANS PARISH...PLAQUEMINES PARISH...ST. BERNARD PARISH
 
NATIONAL WEATHER SERVICE DOPPLER RADAR AT 135 PM CDT INDICATED CLUSTERS
OF VERY STRONG THUNDERSTORMS OVER PORTIONS OF THE GREATER NEW ORLEANS
METRO AREA. THIS AREA IS MAINLY ALONG THE RIVER FROM THE WEST BANK OF
ORLEANS PARISH INTO ST BERNARD PARISH NEAR ALGIERS AREA..VIOLET AND
CHALMETTE AREA. RAINFALL RATES OF 2 TO 3 INCHES PER HOUR ARE INDICATED
BY RADAR. PUBLIC REPORTED 4.25 INCHES IN VIOLET ABOUT 130 PM CDT.
SERIOUS STREET FLOODING HAS BEEN REPORTED IN PORTIONS OF THIS AREA.
 
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood 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 7, 11:00 AM CDT, 2 hours 40 minutes before

LAZ034>040-046>049-056>070-MSZ068>071-080>082-081200-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT MON JUL 7 1997

AFTERNOON SEABREEZE THUNDERSTORMS WILL BE THE PRIMARY CONCERN TODAY.
LOCAL DOWNBURST WINDS OF 35 TO 45 MPH ARE POSSIBLE WITH SOME OF THE
EARLIER DEVELOPING STORMS. OTHERWISE...BRIEF HEAVY RAINS OF 1 TO 2
INCHES PER HOUR AND LIGHTNING WILL BE THE PREDOMINANT STORM CONDITIONS
THROUGH SUNSET. SOME OF THE THUNDERSTORMS NEAR WATER MAY ALSO SPAWN A
WATERSPOUT OR TWO...MAINLY BEFORE 1 PM.

Special weather statement, Jul 7, 11:23 AM CDT, 2 hours 17 minutes before

LAZ034>040-046>049-056>070-MSZ068>071-080>082-081200-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
1100 AM CDT MON JUL 7 1997

AFTERNOON SEABREEZE THUNDERSTORMS WILL BE THE PRIMARY CONCERN TODAY.
LOCAL DOWNBURST WINDS OF 35 TO 45 MPH ARE POSSIBLE WITH SOME OF THE
EARLIER DEVELOPING STORMS. OTHERWISE...BRIEF HEAVY RAINS OF 1 TO 2
INCHES PER HOUR AND LIGHTNING WILL BE THE PREDOMINANT STORM CONDITIONS
THROUGH SUNSET. SOME OF THE THUNDERSTORMS NEAR WATER MAY ALSO SPAWN A
WATERSPOUT OR TWO...MAINLY BEFORE 1 PM.

Local storm report, Jul 7, 1:16 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORTS
NATIONAL WEATHER SERVICE NEW ORLEANS LA
115 PM CDT MON JUL  7 1997

TIME(CDT)  .....CITY LOCATION...... STATE ...EVENT/REMARKS...
           ....COUNTY LOCATION......

1215 PM    5 SE CHALMETTE            LA   FUNNEL CLOUDS
07/07/97   ST. BERNARD                    NUMEROUS REPORTS OF VISUAL
                                          OBSERVATIONS OF A FEW FUNNEL
                                          CLOUDS BETWEEN CHALMETTE AND
                                          VIOLET. UNDETERMINED IF THE
                                          FUNNELS EVER TOUCHED DOWN BUT
                                          WERE REPORTED TO EXTEND CLOSE
                                          TO THE GROUND AT 1220 PM.

1220 PM    LAKE SALVADOR             LA   FUNNEL CLOUD
07/07/97   ST. CHARLES                    POSSIBLE WATER SPOUT OBSERVED.
                                          RELAYED REPORT BY WDSU-TV6
                                          METEOROLOGIST.

0100 PM    VIOLET                    LA   FLOODING
07/07/97   ST. BERNARD                    FLOODING OF STREETS REPORTED
                                          BY VIOLET FIRE DEPARTMENT.

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 12:22 PM CDT	Tornado Warning	LIX	Saint Bernard	38 min
Jul 7, 12:27 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Saint Charles	33 min
Jul 7, 3:39 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	51 min

Nearby

Flash Flood Warnings in Louisiana, 1997 Every flash flood 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.