Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 5, NWS New Orleans, LA

February 15, 1990Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Feb 15, 1990, 8:42 PM CST for Tangipahoa Parish, Louisiana. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Feb 15, 1990, 8:42 PM CST (02:42 UTC)
Expired
Feb 15, 1990, 9:30 PM CST
In force
48 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Tangipahoa 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, 2.7 hours before the alert went out and 80 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, Slidell Radar S, LA at 00:00Z on 1990-02-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Slidell Radar S, LA at 00:00Z on 1990-02-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.8

Open this sounding in Storm Lab

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, Feb 15, 6:05 PM CST, 2 hours 37 minutes before
LAZ009-008-006-160100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
605 PM CST THU FEB 15 1990

...TORNADO WATCH UNTIL 10 PM CST TONIGHT FOR EAST CENTRAL LOUISIANA
EXCEPT ASCENSION PARISH...

AT 6 PM CST RADAR SHOWED THUNDERSTORMS HAD MOVED FROM EAST CENTRAL
LOUISIANA INTO MISSISSIPPI.  THUNDERSTORMS CONTINUED IN NORTH
LOUISIANA...WITH SHOWERS DEVELOPING BETWEEN LAFAYETTE AND BATON ROUGE.

ADDITIONAL THUNDERSTORM DEVELOPcMENT IS EXPECTED TONIGHT ACROSS EAST
CENTRAL LOUISIANA.  PERSONS SHOULD REMAIN ALERT AND LISTEN FOR LATEST
STATEMENTS OR WARNINGS.
Special weather statement, Feb 15, 6:39 PM CST, 2 hours 3 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-160200-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
630 PM CST THU FEB 15 1990

...A TORNADO WATCH IS IN EFFECT UNTIL 100 PM FOR PART OF SOUTHEAST
   LOUISIANA INCLUDING WASHINGTON...TANGIPAHOA...ST TAMMANY AND UPPER
   ST MARTIN PARISHES...

OVER SOUTHEAST LOUISIANA WIDELY SCATTERED RAIN SHOWERS WERE OCCURRING
FROM LAKE MAAUREPAS NORTHEAST BETWEEN MCCOMB MISSISSIPPI AND BOGALUSA
LOUISIANA LOUISIANA AND ON NORTHEAST OVER MISSISSIPPI BETWEEN MCCOMB
AND HATTIESBURG TO BETWEEN JACKSON AND MERIDIAN.

ISOLATED LIGHT RAIN SHOWERS WERE OCCURRING ALONG THE COASTAL SECTIONS
AND IN THE COASTAL WATERS NEAR VERMILION BAY.

THE SHOWERS WERE MOVING NORTHEAST AT 35 MILES AN HOUR.
Special weather statement, Feb 15, 7:04 PM CST, 1 hour 38 minutes before
LAZ009-008-006-160200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
705 PM CST THU FEB 15 1990

...TORNADO WATCH UNTIL 10 PM CST TONIGHT FOR EAST CENTRAL LOUISIANA
EXCEPT ASCENSION PARISH...

AT 7 PM CST RADAR SHOWED THUNDERSTORMS CONTINUED OVER NORTHEAST
LOUISIANA NEAR MONROE...WITH SHOWERS DEVELOPING FROM BATON ROUGE TO
LAFAYETTE SOUTH INTO THE GULF.  THUNDERSTORMS WERE MOVING NORTHEAST
AT 40 MPH.

PERSONS SHOULD REMAIN ALERT AS ADDITIONAL THUNDERSTORM DEVELOPMENT
WILL OCCUR THROUGH TONIGHT.
Special weather statement, Feb 15, 7:33 PM CST, 1 hour 9 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-160300-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
733 PM CST THU FEB 15 1990

...A TORNADO WATCH IS IN EFFECT UNTIL 100 PM FOR PART OF SOUTHEAST
   LOUISIANA INCLUDING WASHINGTON...TANGIPAHOA...ST TAMMANY AND UPPER
   ST MARTIN PARISHES...

SCATTERED RAIN SHOWERS AND THUNDERSTORMS EXTENDED FROM JUST WEST OF
ATCHAFALAYA BAY NORTHEAST BETWEEN NEW IBERIA AND MORGAN CITY AND ON
NORTHEAST OVER BATON ROUGE. THESE THUNDERSTORMS WERE INCREASING IN
INTENSITY.

WIDELY SCATTERED RAIN SHOWERS AND THUNDERSTORMS EXTENDED FROM BETWEEN
LAKE PONTCHARTRAIN AND BATON ROUGE INTO SOUTH CENTRAL MISSISSIPPI WEST
OF HATTIESBURG AND WEST OF LAUREL.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 45 MILES AN HOUR.
Special weather statement, Feb 15, 7:50 PM CST, 52 minutes before
LAZ009-008-006-160245-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
750 PM CST THU FEB 15 1990

...TORNADO WATCH CONTINUES UNTIL 10 PM CST FOR EAST CENTRAL LOUISIANA
EXCEPT ASCENSION PARISH...

AT 745 PM CST RADAR SHOWED THUNDERSTORMS WITH STRONG WIND GUSTS...VERY
HEAVY RAIN AND HAIL NEAR PLAQUEMINE MOVING NORTHEAST AT 40 MPH.  THESE
THUNDERSTORMS WILL MOVE OVER THE BATON ROUGE METROPOLITAN AREA
SHORTLY.  ADDITIONAL THUNDERSTORM DEVELOPMENT IS LIKELY TONIGHT.

PERSONS SHOULD REMAIN ALERT AND LISTEN FOR LATEST STATEMENTS OR
WARNINGS.
Special weather statement, Feb 15, 8:33 PM CST, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 15, 8:30 PM CSTSevere Thunderstorm WarningLIXLivingston20 min
Feb 15, 9:01 PM CSTTornado WarningLIXTangipahoa29 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1990Every severe thunderstorm warning 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.