Alert archive / Louisiana / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 4, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Mar 12, 1986, 5:30 PM CST for Saint John the Baptist Parish, Louisiana. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Mar 12, 1986, 5:30 PM CST (23:30 UTC)
- Expired
- Mar 12, 1986, 6:30 PM CST
- In force
- 60 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
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, 11.5 hours before the alert went out and 136 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.
- 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
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Mar 12, 12:47 PM CST, 4 hours 43 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, 3 hours 46 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, 2 hours 55 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, 2 hours 55 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, 2 hours 47 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.
Special weather statement, Mar 12, 4:40 PM CST, 50 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 2:30 AM CST | Severe Thunderstorm Warning | LIX | Catahoula, Concordia | 50 min |
| Mar 12, 6:05 AM CST | Severe Thunderstorm Warning | LIX | Avoyelles, Saint Landry | 60 min |
| Mar 12, 3:15 PM CST | Tornado Warning | LIX | Saint Tammany, Washington | 60 min |
| Mar 12, 5:30 PM CST | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa | 60 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1986Every severe thunderstorm warning 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.