Alert archive / Louisiana / Tornado Warnings in 1990
Tornado Warning 6, NWS New Orleans, LA
NWS New Orleans, LA issued this tornado warning at Mar 15, 1990, 3:30 AM CST for Plaquemines Parish, Louisiana. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Mar 15, 1990, 3:30 AM CST (09:30 UTC)
- Expired
- Mar 15, 1990, 5:30 AM CST
- In force
- 2 hr
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Plaquemines 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 9.5 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.
- Mixed-layer CAPE
- 267 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 712 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
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 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 14, 11:33 PM CST, 3 hours 57 minutes before
LAZ006-008-009-150630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 1135 PM CST WED MAR 14 1990 ...RAIN AND THUNDERSTORMS MOVING ACROSS PARTS OF EAST CENTRAL LOUISIANA... RADAR SHOWED RAIN AND THUNDERSTORMS FROM VICKSBURG MISSISSIPPI TO ALEXANDRIA...SIMMESPORT AND OPELOUSAS. PRECIPITATION WAS MOVING SOUTHEAST AT 20 MPH. PEOPLE IN EAST CENTRAL LOUISIANA CAN EXPECT PERIODS OF HEAVY RAIN WITH FLOODING OF STREETS AND OTHER LOW LYING AREAS AND GUSTY WINDS.
Special weather statement, Mar 15, 12:37 AM CST, 2 hours 53 minutes before
LAZ-008-009-150730- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 1230 AM CST THU MAR 15 1990 ...THUNDERSTORMS WITH VERY HEAVY RAIN WERE MOVING ACROSS PARTS OF THE BATON ROUGE METROPOLITAN AREA... RADAR SHOWED A 10 MILE WIDE SOLID LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM SOUTHWEST MISSISSIPPI SOUTHWEST ACROSS WEST FELICIANA AND POINTE COUPEE PARISHES TO LAFAYETTE. MOVEMENT WAS SOUTHEAST ABOUT 25 MPH. PEOPLE THROUGHOUT EAST BATON ROUGE AND SURROUNDING PARISHES CAN EXPECT FLOODING OF STREETS AND OTHER LOW LYING AREAS AND STRONG AND GUSTY WIND SHIFTING TO NORTHWEST AS THESE THUNDERSTORMS PASS THROUGH FOR THE NEXT FEW HOURS. ELSEWHERE...RADAR SHOWED SCATTERED SHOWERS AND A FEW THUNDERSTORMS FROM MCCOMB TO BOGALUSA...EXTENDING SOUTHWEST TO NEW IBERIA AND MORGAN CITY. A SOLID BAND OF MOSTLY LIGHT RAIN AND ISOLATED THUNDERSTORMS EXTENDED FROM NORTHEAST LOUISIANA SOUTHWEST ACROSS ALEXANDRIA TO LAKE CHARLES.
Special weather statement, Mar 15, 1:30 AM CST, 2 hours before
LAZ-006-008-009-150830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 130 AM CST THU MAR 15 1990 ...THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE MOVING ACROSS PARTS OF THE BATON ROUGE METROPOLITAN AREA... RADAR SHOWED A 10 MILE WIDE SOLID LINE OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM SOUTHWEST MISSISSIPPI SOUTHWEST BETWEEN CLINTON AND GREENSBURG...ACROSS BATON ROUGE TO NEAR PLAQUEMINE...CONTINUING SOUTHWEST TO THE COAST. MOVEMENT WAS SOUTHEAST ABOUT 25 MPH. PEOPLE THROUGHOUT EAST BATON ROUGE AND SURROUNDING PARISHES CAN EXPECT FLOODING OF STREETS AND OTHER LOW LYING AREAS AND STRONG AND GUSTY WIND SHIFTING TO NORTHWEST AS THESE THUNDERSTORMS PASS THROUGH FOR THE NEXT FEW HOURS. ELSEWHERE...RADAR SHOWED SCATTERED SHOWERS AND A FEW THUNDERSTORMS FROM MCCOMB TO BOGALUSA...EXTENDING SOUTHWEST TO NEW IBERIA AND MORGAN CITY. LARGE SOLID AREAS OF MOSTLY LIGHT RAIN AND A FEW THUNDERSTORMS EXTENDED FROM ?NORTHEAST LOUISIANA SOUTHWEST ACROSS ALEXANDRIA TO LAKE CHARLES...AND BETWEEN JONESVILLE AND NATZHEZ SOUTH TO BETWEEN BATON ROUGE AND LAFAYETTE.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 3:30 AM CST | Tornado Warning | LIX | Jefferson, Lafourche | 2 hr |
| Mar 15, 3:50 AM CST | Tornado Warning | LIX | Saint Bernard | 100 min |
Nearby
Tornado Warnings in Louisiana, 1990Every tornado warning in 1990Tornadoes in 1990
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.