Alert archive / Louisiana / Tornado Warnings in 1986

Tornado Warning 1, NWS New Orleans, LA

March 12, 1986Saint Tammany Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Mar 12, 1986, 3:15 PM CST for Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Mar 12, 1986, 3:15 PM CST (21:15 UTC)
Expired
Mar 12, 1986, 4:15 PM CST
In force
60 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Washington 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, 9.3 hours before the alert went out and 156 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 1986-03-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 345 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 1986-03-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 200 square meters per square second.19395878Sfc1 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
345 J/kg
Mixed-layer CIN
-314 J/kg
Mixed-layer LCL
995 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
200 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 122117
TORNEW
LAC103-117-122215-

BULLETIN...EBS ACTIVATION REQUESTED...
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
315 PM CST WED MAR 12 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING UNTIL
415 PM CST FOR ST TAMMANY AND WASHINGTON PARISHES IN SOUTHEAST
LOUISIANA.

AT 310 PM CST RADAR INDICATES A POSSIBLE TORNADO JUST WEST OF
COVINGTON IN ST TAMMANY PARISH. THE STORM IS MOVING NORTHEAST AT
45 MPH AND WILL MOVE ACROSS NORTHWEST PORTION OF ST TAMMANY PARISH
AND SOUTHEAST PORTION OF WASHINGTON PARISH.

PEOPLE IN THE PATH OF THIS STORM SHOULD SEEK SAFE SHELTER IMMEDIATELY.

What forecasters said that day

The local office's own words before this tornado 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, Mar 12, 11:49 AM CST, 3 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1150 AM CST WED MAR 12 1986

...CLUSTERS OF THUNDERSTORMS CONTINUED OVER ASCENSION..EAST BATON
ROUGE AND IBERVILLE PARISHES...

AT 1145 AM RADAR SHOWED THUNDERSTORMS BETWEEN BATON ROUGE..PLAQUEMINE
AND DONALDSONVILLE LOUISIANA.  THE THUNDERSTORMS WERE MOVING RAPIDLY
NORTH..HOWEVER DUE TO THUNDERSTORMS MOVING ACROSS THE SAME TRACK..
FLOODING OF STREETS AND UNDERPASSES LIKELY.

THE STRONG TUNDERSTORMS WILL PRODUCE HIGH WINDS..DANGEROUS LIGHTNING
WITH HEAVY RAIN AND HAIL.
Special weather statement, Mar 12, 12:47 PM CST, 2 hours 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1245 PM CST WED MAR 12 1986

...THUNDERSTORMS WERE DECREASING ACROSS THE BATON ROUGE METROPOLITAN
AREA...

AT 1240 PM RADAR SHOWED THUNDERSTORMS BETWEEN BATON ROUGE..PLAQUEMINE
AND ST. FRANCISVILLE LOUISIANA AND FROM DONALDSONVILLE TO GREENSBURG
LOUISIANA.  THE THUNDERSTORMS WERE MOVING RAPIDLY NORTHEAST.

STRONG TUNDERSTORMS WILL PRODUCE HIGH WINDS..DANGEROUS LIGHTNING
WITH HEAVY R[AIN AND HAIL.
Special weather statement, Mar 12, 1:44 PM CST, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
145 PM CST WED MAR 12 1986

...A BAND OF THUNDERSTORMS AND SHOWERS HAS DEVELOPED ACROSS AVOYELLES
AND ST. LANDRY PARISHES...

AT 140 PM RADAR SHOWED THUNDERSTORMS NEAR PORT BARRE AND SIMMESPORT
LOUISIANA WITH SHOWERS DEVELOPING INBETWEEN.  THE TUNDERSTORMS WERE
MOVING NORTHEAST AT 40 MPH.

STRONG THUNDERSTORMS WILL PRODUCE HIGH WINDS..DANGEROUS LIGHTNING
WITH HEAVY RAIN AND HAIL.
Special weather statement, Mar 12, 2:35 PM CST, 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
335 PM CST WED MAR 12 1986

..LINE OF VERY HEAVY THUNDERSTORMS MOVING OUT OF SOUTHEAST LOUISIANA..

A LINE OF VERY HEAVY THUNDERSTORMS EXTENDED FROM THE NORTH SHORE OF
LAKE PONTHCARTRAIN BETWEEN SLIDELL AND COVINGTON NORTHWARD OVER
BOGALUSA AND INTO SOUTHEAST MISSISSIPPI JUST WEST OF HATTIESBURG AND
LAUREL. ANOTHER HEAVY THUNDERSTORM WAS LOCATED 10 MILES NORTHEAST OF
THIBODAUX.

THESE THUNDERSTORMS IN SOUTHEAST LOUISIANA WILL PRODUCE STRONG GUSTY
WINDS...BRIEF PERIODS OF HEAVY RAIN AND POSSIBLY SMALL HAIL.

ELSEWHERE WIDELY SCATTERED HEAVY THUNDERSTORMS INCLUDED IN WIDESPREAD
LIGHT RAIN WAS OCCURRING FROM THE COAST NEAR HOUMA AND EXTENDED NORTH
BETWEEN BATON ROUGE AND SLIDELL AND INTO SOUTH MISSISSIPPI.

WIDELY SCATTERED THUNDERSHOWERS WERE OCCURRING FROM OPELOUSAS
LOUISIANA INTO SOUTHWEST MISSISSIPPI.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 45 MILES AN HOUR.
Special weather statement, Mar 12, 2:35 PM CST, 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
435 PM CST WED MAR 12 1986

..LINE OF VERY HEAVY THUNDERSTORMS MOVING OUT OF SOUTHEAST LOUISIANA..

A LINE OF VERY HEAVY THUNDERSTORMS EXTENDED FROM THE NORTH SHORE OF
LAKE PONTHCARTRAIN BETWEEN SLIDELL AND COVINGTON NORTHWARD OVER
BOGALUSA AND INTO SOUTHEAST MISSISSIPPI JUST WEST OF HATTIESBURG AND
LAUREL. ANOTHER HEAVY THUNDERSTORM WAS LOCATED 10 MILES NORTHEAST OF
THIBODAUX.

THESE THUNDERSTORMS IN SOUTHEAST LOUISIANA WILL PRODUCE STRONG GUSTY
WINDS...BRIEF PERIODS OF HEAVY RAIN AND POSSIBLY SMALL HAIL.

ELSEWHERE WIDELY SCATTERED HEAVY THUNDERSTORMS INCLUDED IN WIDESPREAD
LIGHT RAIN WAS OCCURRING FROM THE COAST NEAR HOUMA AND EXTENDED NORTH
BETWEEN BATON ROUGE AND SLIDELL AND INTO SOUTH MISSISSIPPI.

WIDELY SCATTERED THUNDERSHOWERS WERE OCCURRING FROM OPELOUSAS
LOUISIANA INTO SOUTHWEST MISSISSIPPI.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 45 MILES AN HOUR.
Local storm report, Mar 12, 2:43 PM CST, 32 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LOUISIANA
240 PM CST WED MAR 12 1986

ABOUR 1230 PM CST A SMALL TORNADO WAS REPORTED TO HAVE TOUCHED DOWN
WEST OF FRANKLINTON IN WASHINGTON PARISH. SOME WINDOWS BLOWN OUT OF
A SHOP AND A FEW CARS. LIMBS DOWN. IN FRANKLINTON APPARENT STRAIGHT
LINE WINDS BLEW DOWN SOME SIGNS AND LIMBS. ALSO A CAR STOPPED AT
A RED LIGHT WAS PICKED UP AND TURNED AROUND. NO KNOWN INJURIES AT
THIS TIME.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 12, 2:30 AM CSTSevere Thunderstorm WarningLIXCatahoula, Concordia50 min
Mar 12, 6:05 AM CSTSevere Thunderstorm WarningLIXAvoyelles, Saint Landry60 min
Mar 12, 5:30 PM CSTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa60 min
Mar 12, 5:30 PM CSTSevere Thunderstorm WarningLIXSaint John the Baptist60 min

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.