Alert archive / Louisiana / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 18, NWS New Orleans, LA

May 5, 1989Saint Landry Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 5, 1989, 3:56 AM CDT for Saint Landry Parish, Louisiana. It was in force for 49 min. 1 report 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 5, 1989, 3:56 AM CDT (08:56 UTC)
Expired: May 5, 1989, 4:45 AM CDT
In force: 49 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Saint Landry 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

Time	Report	Where	Remark
May 5, 4:15 AM CDT	Thunderstorm Wind 0	St. Landry, 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, 8.9 hours before the alert went out and 224 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 29 J/kg
Mixed-layer CIN: -221 J/kg
Mixed-layer LCL: 1010 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -78 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 4, 10:11 PM CDT, 5 hours 45 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 7:25 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Charles	50 min
May 4, 7:25 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	50 min
May 4, 8:00 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	60 min
May 5, 4:23 AM CDT	Severe Thunderstorm Warning	LIX	Iberia, Saint Martin	67 min
May 5, 4:26 AM CDT	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	64 min
May 5, 4:48 AM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	47 min
May 5, 5:13 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena	62 min
May 5, 5:18 AM CDT	Severe Thunderstorm Warning	LIX	Assumption, St. Mary	57 min
May 5, 5:30 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa	60 min
May 5, 5:42 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	63 min
May 5, 5:58 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint James, Saint John the Baptist	62 min
May 5, 5:58 AM CDT	Severe Thunderstorm Warning	LIX	Terrebonne	62 min
May 5, 6:21 AM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	69 min
May 5, 6:40 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	50 min
May 5, 7:00 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	45 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1989 Every 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.