Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 34, NWS New Orleans, LA

May 27, 1990Jefferson Parish, Orleans Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 27, 1990, 7:00 PM CDT for Jefferson Parish, Orleans Parish, Saint Charles Parish, Louisiana. It was in force for 60 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 27, 1990, 7:00 PM CDT (00:00 UTC)
Expired
May 27, 1990, 8:00 PM CDT
In force
60 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Jefferson Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
May 27, 7:00 PM CDTThunderstorm Wind 0Orleans, LA
May 27, 7:25 PM CDTThunderstorm Wind 0Orleans, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.0 hours before the alert went out and 58 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 1990-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2426 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 00:00Z on 1990-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.193958Sfc1 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
2426 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
939 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

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, 2:47 PM CDT, 4 hours 13 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, 3 hours 33 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, 3 hours 30 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, 3 hours 12 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, 2 hours 17 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.
Special weather statement, May 27, 6:50 PM CDT, 10 minutes before
LAZ006-008-009-270000-

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

...ALL SEVERE THUNDERSTORM WARNINGS FOR PARISHES IN EAST CENTRAL
LOUISIANA HAVE EXPIRED AND ARE NO LONGER IN EFFECT.

....THE SEVERE THUNDERSTORM WATCHES ARE CANCELLED FOR ALL OF EAST
CENTRAL LOUISIANA AS OF 645 PM CDT THSI SUNDAY EVENING.

RADAR SHOWED THE LINE OF SEVERE THUNDERSTORMS HAS MOVED SOUTHEAST
OF THE AREA.  OTHER THUNDERSTORMS WAS INDICATED FROM SOUTHWEST
MISSISSIPPI EXTENDING SOUTHWEST ACROSS METROPOLITAN BATON ROUGE.
THESE THINDERSTORMS WILL MOVE OUT OF THE AREA LATER IN THE EVENING.

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 7:05 PM CDTSevere Thunderstorm WarningLIXPlaquemines, Saint Bernard55 min
May 28, 8:44 AM CDTSevere Thunderstorm WarningLIXPointe Coupee, Saint Landry61 min
May 28, 10:51 AM CDTSevere Thunderstorm WarningLIXTangipahoa69 min
May 28, 11:22 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington68 min
May 28, 11:56 AM CDTTornado WarningLIXLafourche, Terrebonne34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.