Alert archive / Louisiana / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 18, NWS New Orleans, LA

March 27, 1987Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 27, 1987, 8:49 AM CST for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 56 min. 3 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: Mar 27, 1987, 8:49 AM CST (14:49 UTC)
Expired: Mar 27, 1987, 9:45 AM CST
In force: 56 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa 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
Mar 27, 9:05 AM CST	Hail 1.75	Tangipahoa, LA
Mar 27, 9:10 AM CST	Hail 1.75	St. Tammany, LA
Mar 27, 9:25 AM CST	Hail 1.75	St. Tammany, 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

Boothville, LA (KBVE), launched 12:00Z, 2.8 hours before the alert went out and 152 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: 126 J/kg
Mixed-layer CIN: -250 J/kg
Mixed-layer LCL: 633 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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.

Issued	Product	Office	Counties	Lasted
Mar 27, 8:16 AM CST	Severe Thunderstorm Warning	LIX	Assumption, Saint James	59 min
Mar 27, 8:16 AM CST	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	59 min
Mar 27, 12:26 PM CST	Severe Thunderstorm Warning	LIX	Plaquemines	64 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1987 Every severe thunderstorm warning in 1987

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.