Alert archive / Louisiana / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 40, NWS New Orleans, LA

May 18, 1989East Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 18, 1989, 1:57 PM CDT for East Baton Rouge Parish, Louisiana. It was in force for 48 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 18, 1989, 1:57 PM CDT (18:57 UTC)
Expired
May 18, 1989, 2:45 PM CDT
In force
48 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County East Baton Rouge 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 18, 2:15 PM CDTThunderstorm Wind 0East Baton Rouge, LA
May 18, 2:30 PM CDTThunderstorm Wind 0East Baton Rouge, 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 12:00Z, 7.0 hours before the alert went out and 138 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 1989-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1217 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 1989-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.19395878Sfc1 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
1217 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
537 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.8

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

Local storm report, May 18, 11:41 AM CDT, 2 hours 16 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1142 AM CDT THU MAY 18 1989

MAY 18 1989...

     1134 AM CDT...TREES AND POWER LINES DOWN...HIGH WINDS AND STREET
     FLOODING IN WASHINGTON LA ABOUT 7 MILES NORTH OF OPELOUSAS...BY
     THE ST LANDRY PARISH SHERIFF OFFICE.  NO INJURIES.
Local storm report, May 18, 1:10 PM CDT, 47 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE BATON ROUGE LA
112 PM CDT THU MAY 18 1989

MAY 18 1989...

     1234 PM CDT...TREES DOWN ON HIGHWAY 182 AT SUNSET LOUISIANA.
     TREES FELL ON TWO MOBILE HOMES...M,AJOR DAMAGE TO MOBILE HOMES
     ...BY ST LANDRY PARISH SHERIFF OFFICE.  NO INJURIES.

The office that day

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

IssuedProductOfficeCountiesLasted
May 18, 11:22 AM CDTSevere Thunderstorm WarningLIXSaint Landry68 min
May 18, 11:51 AM CDTSevere Thunderstorm WarningLIXPointe Coupee, Saint Landry69 min
May 18, 12:13 PM CDTSevere Thunderstorm WarningLIXIberia, Saint Martin62 min
May 18, 12:29 PM CDTTornado WarningLIXSaint Martin46 min
May 18, 12:29 PM CDTTornado WarningLIXSaint Landry61 min
May 18, 12:57 PM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge63 min
May 18, 12:57 PM CDTSevere Thunderstorm WarningLIXWest Feliciana63 min
May 18, 1:14 PM CDTTornado WarningLIXIberville, West Baton Rouge46 min
May 18, 2:30 PM CDTSevere Thunderstorm WarningLIXIberia, Saint Martin60 min
May 18, 3:38 PM CDTSevere Thunderstorm WarningLIXIberville, West Baton Rouge52 min
May 18, 4:01 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge44 min
May 18, 4:50 PM CDTSevere Thunderstorm WarningLIXAssumption, Saint Martin, St. Mary55 min
May 18, 5:09 PM CDTSevere Thunderstorm WarningLIXLafourche, Terrebonne66 min
May 18, 5:27 PM CDTSevere Thunderstorm WarningLIXTangipahoa63 min
May 18, 5:33 PM CDTSevere Thunderstorm WarningLIXLivingston42 min
May 18, 6:33 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington42 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1989Every severe thunderstorm warning in 1989

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.