Alert archive / Louisiana / Tornado Warnings in 1997

Tornado Warning 11, NWS New Orleans, LA

July 18, 1997Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jul 18, 1997, 4:04 AM CDT for Plaquemines Parish, Louisiana. It was in force for 26 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 18, 1997, 4:04 AM CDT (09:04 UTC)
Expired: Jul 18, 1997, 4:30 AM CDT
In force: 26 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Plaquemines Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.1 hours before the alert went out and 79 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: 1027 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 3 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 180904 RRA
TORNEW
LAC075-180930-
 
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
404 AM CDT FRI JUL 18 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  430 AM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...CENTRAL PLAQUEMINES PARISH
 
AND THE ADJACENT COASTAL WATERS
 
AT 4 AM CDT...RADAR INDICATED A POSSIBLE TORNADO NEAR PORT SULPHUR. THE
STORM PRODUCING THIS POSSIBLE TORNADO WAS PART OF THE EYEWALL OF
HURRICANE DANNY...ROTATING TO THE NORTHWEST AT 25MPH.
 
HURRICANE FORCE WINDS OF 75 TO 80 MPH CAN BE EXPECTED WITH THIS
PARTICULAR STORM AS WELL AS TORNADIC DAMAGE AS IT APPROACH:ES POINTE A LA
HACHE.
 
PERSONS IN THE VICINITY OF PORT SULPHUR AND POINTE A LA HACHE SHOULD
TAKE COVER IMMEDIATELY.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 4:43 AM CDT	Tornado Warning	LIX	Plaquemines	17 min
Jul 18, 5:41 AM CDT	Tornado Warning	LIX	Plaquemines	34 min

Nearby

Tornado Warnings in Louisiana, 1997 Every tornado warning in 1997 Tornadoes 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.