Alert archive / Louisiana / Tornado Warnings in 1986

Tornado Warning 2, NWS New Orleans, LA

May 18, 1986Ascension Parish, Livingston Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 18, 1986, 10:16 AM CDT for Ascension Parish, Livingston Parish, Louisiana. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
May 18, 1986, 10:16 AM CDT (15:16 UTC)
Expired
May 18, 1986, 11:15 AM CDT
In force
59 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Ascension Parish, LA, Livingston Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Boothville, LA (KBVE), launched 12:00Z, 3.3 hours before the alert went out and 176 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, Boothville, LA at 12:00Z on 1986-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2060 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, Boothville, LA at 12:00Z on 1986-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 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
2060 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBTR 181520
TORBTR
LAC033-005-063-181615-

BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BATON ROUGE LA
1016 AM CDT SUN MAY 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE
UNTIL 1115 AM CDT FOR THE FOLLOWING PARISHES IN

EAST CENTRAL LOUISIANA...ASCENSION AND LIVINGSTON.

AT 1005 AM THE COAST GUARD REPORTED A TORNADO NEAR DONALDSONVILLE
LOUISIANA MOVING NORTHEAST AT 40 MPH.

PEOPLE IN THESE PARISHES SHOUYLD MOVE TO A SAFE PLACE AS SOON AS
POSSIBLE.  TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW
ENFORCEMENT OFFICE.

Nearby

Tornado Warnings in Louisiana, 1986Every tornado warning in 1986Tornadoes in 1986

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.