Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 32, NWS New Orleans, LA

May 27, 1990Ascension Parish, Livingston Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 27, 1990, 6:19 PM CDT for Ascension Parish, Livingston Parish, Louisiana. It was in force for 26 min.

The area

The counties it named.

The facts

Issued
May 27, 1990, 6:19 PM CDT (23:19 UTC)
Expired
May 27, 1990, 6:45 PM CDT
In force
26 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.3 hours before the alert went out and 108 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 12:00Z on 1990-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1682 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, Slidell Radar S, LA at 12:00Z on 1990-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 square meters per square second.1939Sfc1 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
1682 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

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, May 27, 2:45 PM CDT, 3 hours 34 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-272035-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
235 PM CDT SUN MAY 27 1990

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 8 PM CDT FOR THE
FOLLOWING PARISHES IN SOUTHEAST LOUISIANA... ASSUMPTION..IBERIA..ST.
MARY..UPPER ST. MARTIN...LOWER ST. MARTIN AND THE ADJOINING COASTAL
WATERS OF IBERIA AND ST MARY PARISHES.

SCATTERED THUNDERSTORMS SOME WITH VERY HEAVY RAIN CONTINUED IN SOUTHWEST
MISSISSIPPI AND ALSO CONTINUED TO DEVELOP IN CENTRAL LOUISIANA, THESE
STORMS EXTENDED FROM NEAR ALEXANDRIA EAST ACROSS NATCHEZ AND MC COMB
TO NEAR HATTIESBURG MISSISSIPPI.

THESE STORMS HAVE INCREASED IN STRENGTH AND COVERAGE OVER THE LAST
HOUR WHILE THE STRONGEST STORM IS LOCATED 5 MILES NORTHWEST OF MC COMB

MOVEMENT WAS SOUTHEAST AT 30 MILES AN HOUR.
Special weather statement, May 27, 2:47 PM CDT, 3 hours 32 minutes before
LAZ006-008-009-272100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
245 PM CDT SUN MAY 27 1990

...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8PM FOR PEOPLE
IN AVOYELLES...CATAHOULA...CONCORDIA...IBERVILLE...POINTE COUPEE...
ST. LANDRY AND WEST FELICIANA PARISHES IN EAST CENTRAL LOUISIANA...

RADAR SHOWED CLUSTERS OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN
FROM NORTHERN CATAHOULA PARISH...SOUTHWEST TO ALEXANDRIA..THEN SOUTH
TO NEAR VILLE PLATTE.  MOVEMENT WAS EAST ABOUT 35 MPH.

THESE THUNDERSTORMS WILL MOVE TO AVOYELLES...CONCORDIA AND ST. LANDRY
PARISHES WITHIN THE HOUR.

ELSEWHERE RADAR SHOWED NUMEROUS STRONG THUNDERSTORMS OVER NORTHEAST AND
WEST CENTRAL LOUISIANA AND SOUTHWEST MISSISSIPPI.  SCATTERED THUNDER-
STORMS WERE OCCURRING BETWEEN BATON ROUGE AND OPELOUSAS.
<
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE
FOR THUNDERSTORMS PRODUCING DAMAGING WINDS AND LARGE HAIL IN AND CLOSE
TO THE WATCH AREA.  PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND
POSSIBLE WARNINGS.
Special weather statement, May 27, 3:27 PM CDT, 2 hours 52 minutes before
LAZ006-008-009-272145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BATON ROUGE LA
245 PM CDT SUN MAY 27 1990

...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8PM FOR PEOPLE
IN AVOYELLES...CATAHOULA...CONCORDIA...IBERVILLE...POINTE COUPEE...
ST. LANDRY AND WEST FELICIANA PARISHES IN EAST CENTRAL LOUISIANA...

MARBLE SIZE HAIL WAS REPORTED IN THE ENTERPRISE COMMUNITY IN EXTREME
NORTHERN PART OF CATAHOULA PARISH AROUND 3PM BY THE SHERIFFS OFFICE.

RADAR SHOWED A LARGE STRONG THUNDERSTORM WITH VERY HEAVY RAIN AND
HAIL OVER POINTE COUPEE PARISH BETWEEN NEW ROADS AND LIVONIA.  A SOLID
LINE OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL EXTENDED
FROM NEAR FERRIDAY IN CONCORDIA PARISH EXTENDING SOUTHWEST ACROSS
ALEXANDRIA.  MOVEMENT WAS EAST ABOUT 35 MPH.

THESE THUNDERSTORMS WILL CONTINUE MOVING THROUGH THE WATCH AREA THIS
AFTERNOON AND PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND
POSSIBLE WARNINGS.
Special weather statement, May 27, 3:30 PM CDT, 2 hours 49 minutes before
LAZ006-008-009-272145-

SPECIAL WEATHER STATEMENT...CORRECTED ISSUE TIME
NATIONAL WEATHER SERVICE BATON ROUGE LA
325 PM CDT SUN MAY 27 1990

...A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 8PM FOR PEOPLE
IN AVOYELLES...CATAHOULA...CONCORDIA...IBERVILLE...POINTE COUPEE...
ST. LANDRY AND WEST FELICIANA PARISHES IN EAST CENTRAL LOUISIANA...

MARBLE SIZE HAIL WAS REPORTED IN THE ENTERPRISE COMMUNITY IN EXTREME
NORTHERN PART OF CATAHOULA PARISH AROUND 3PM BY THE SHERIFFS OFFICE.

RADAR SHOWED A LARGE STRONG THUNDERSTORM WITH VERY HEAVY RAIN AND
HAIL OVER POINTE COUPEE PARISH BETWEEN NEW ROADS AND LIVONIA.  A SOLID
LINE OF STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL EXTENDED
FROM NEAR FERRIDAY IN CONCORDIA PARISH EXTENDING SOUTHWEST ACROSS
ALEXANDRIA.  MOVEMENT WAS EAST ABOUT 35 MPH.

THESE THUNDERSTORMS WILL CONTINUE MOVING THROUGH THE WATCH AREA THIS
AFTERNOON AND PEOPLE IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND
POSSIBLE WARNINGS.
Special weather statement, May 27, 3:48 PM CDT, 2 hours 31 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-272135-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
335 PM CDT SUN MAY 27 1990

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM CDT FOR ALL
OF SOUTHEAST LOUISIANA...

SCATTERED THUNDERSTORMS SOME WITH VERY HEAVY RAIN CONTINUED IN SOUTHWEST
MISSISSIPPI AND CENTRAL LOUISIANA, THESE STORMS WERE LOCATED FROM NEAR
DERIDDER NORTHEAST ACROSS ALEXANDRIA TO NEAR VICKSBURG AND EAST ACROSS
NATCHEZ AND MCCOMB TO NEAR HATTIESBURG MISSISSIPPI.

THESE STORMS HAVE INCREASED IN STRENGTH AND COVERAGE OVER THE LAST
HOUR WHILE THE STRONGEST STORM IS LOCATED 40 MILES SOUTHWEST OF MC COMB

ELSHWHERE AN ISOLATED THUNDERSTORM DEVEL"OPED NEAR MOBILE ALABAMA

MOVEMENT OF THESE STORMS IS SOUTHEAST 35 MILES AN HOUR.
Special weather statement, May 27, 4:43 PM CDT, 1 hour 36 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-272235-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
435 PM CDT SUN MAY 27 1990

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM CDT FOR ALL
OF SOUTHEAST LOUISIANA...

NUMEROUS THUNDERSTORMS SOME WITH VERY HEAVY RAIN CONTINUED IN SOUTHWEST
MISSISSIPPI AND CENTRAL LOUISIANA. THESE THUNDERSTORMS EXTENDED FROM 20
MILES NORTH OF LAKE CHARLES LOUISIANA TO THE NORTHEAST ACROSS SIMMESPORT
INTO SOUTHWEST MISSISSIPPI ACROSS MC COMB TO THE HATTIESBURG AREA.

THESE THUNDERSTORMS HAVE PRODUCED WINDS OF OVER 60 MILES AN HOUR IN
CENTRAL LOUISIANA AND ARE ACCOMPANIED WITH VERY HEAVY RAIN AND DANGEROUS
LIGHTNING.

ELSHWHERE...A FEW THUNDERSTORMS WERE OCCURRING ALONG THE LOUISIANA/
MISSISSIPPI STATE LINE SOUTH AND SOUTHEAST OF MC COMB MISSISSIPPI.
A FEW RAINSHOWERS DEVELOPED DURING THE PAST  HOUR OVER SOUTHEAST
LOUISIANA BETWEEN NEW ORLEANS AND BATON ROUGE.

ALSO...As FEW SHOWERS AND AN ISOLATED THUNDERSTORMS CONTINUED OVER
SOUTHEAST MISSISSIPPI 10 MILES NORTH OF PASCAGOULA.

THE BAND OF NUMEROUS THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT
BETWEEN 25 AND 30 MILES AN HOUR.

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 4:18 PM CDTSevere Thunderstorm WarningLIXAvoyelles, Concordia, Pointe Coupee42 min
May 27, 4:59 PM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana61 min
May 27, 5:12 PM CDTSevere Thunderstorm WarningLIXTangipahoa63 min
May 27, 5:13 PM CDTSevere Thunderstorm WarningLIXSaint Helena62 min
May 27, 5:27 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, West Baton Rouge63 min
May 27, 6:03 PM CDTSevere Thunderstorm WarningLIXAscension, Livingston57 min
May 27, 6:08 PM CDTSevere Thunderstorm WarningLIXTangipahoa67 min
May 27, 6:16 PM CDTSevere Thunderstorm WarningLIXLivingston44 min
May 27, 6:28 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington62 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.