Alert archive / Louisiana / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 29, NWS New Orleans, LA

November 25, 1986Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Nov 25, 1986, 8:30 AM CST for Saint Tammany Parish, Tangipahoa Parish, Washington Parish, Louisiana. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Nov 25, 1986, 8:30 AM CST (14:30 UTC)
Expired
Nov 25, 1986, 9:30 AM CST
In force
60 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington 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

Boothville, LA (KBVE), launched 12:00Z, 2.5 hours before the alert went out and 161 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, Boothville, LA at 12:00Z on 1986-11-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1207 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, Boothville, LA at 12:00Z on 1986-11-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
1207 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
688 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 25, 7:00 AM CSTSevere Thunderstorm WarningLIXIberia, Saint Martin, St. Mary60 min
Nov 25, 7:51 AM CSTSevere Thunderstorm WarningLIXLafourche, Saint Charles, Saint John the Baptist54 min
Nov 25, 7:51 AM CSTSevere Thunderstorm WarningLIXAssumption, Terrebonne54 min
Nov 25, 7:51 AM CSTSevere Thunderstorm WarningLIXSaint James54 min
Nov 25, 8:30 AM CSTSevere Thunderstorm WarningLIXOrleans, Plaquemines, Saint Bernard60 min
Nov 25, 8:30 AM CSTSevere Thunderstorm WarningLIXJefferson60 min
Nov 25, 9:30 AM CSTSevere Thunderstorm WarningLIXSaint Tammany, Washington60 min
Nov 25, 9:30 AM CSTSevere Thunderstorm WarningLIXPlaquemines, Saint Bernard60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1986Every severe thunderstorm warning in 1986

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.