Alert archive / Louisiana / Flash Flood Warnings in 1991

Flash Flood Warning 7, NWS New Orleans, LA

May 8, 1991Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 8, 1991, 8:35 AM CDT for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 55 min.

The area

The counties it named.

The facts

Issued: May 8, 1991, 8:35 AM CDT (13:35 UTC)
Expired: May 8, 1991, 9:30 AM CDT
In force: 55 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.6 hours before the alert went out and 268 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: 555 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

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.

What forecasters said that day

The local office's own words before this flash flood 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 8, 5:35 AM CDT, 3 hours before

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Special weather statement, May 8, 6:40 AM CDT, 1 hour 55 minutes before

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Special weather statement, May 8, 7:32 AM CDT, 1 hour 3 minutes before

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Special weather statement, May 8, 7:50 AM CDT, 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 8, 8:27 AM CDT	Severe Thunderstorm Warning	LIX	Saint Charles, Saint John the Baptist	63 min
May 8, 8:42 AM CDT	Tornado Warning	LIX	Tangipahoa	63 min
May 8, 8:51 AM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	69 min
May 8, 9:02 AM CDT	Tornado Warning	LIX	Saint Tammany, Washington	43 min
May 8, 9:38 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	67 min

Nearby

Flash Flood Warnings in Louisiana, 1991 Every flash flood warning in 1991

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.