Alert archive / Louisiana / Flash Flood Warnings in 2020

Flash Flood Warning 16, NWS New Orleans, LA

July 3, 2020Lafourche Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 3, 2020, 12:49 PM CDT for Lafourche Parish, Saint Charles Parish, Louisiana. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 3, 2020, 12:49 PM CDT (17:49 UTC)
Expired: Jul 3, 2020, 2:45 PM CDT
In force: 116 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Lafourche Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.8 hours before the alert went out and 89 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: 1699 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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.

NWS New Orleans, LA wrote its last area forecast discussion before this flash flood warning went out at Jul 3, 12:41 PM CDT, 8 minutes earlier.

Area forecast discussion, Jul 3, 12:41 PM CDT, 8 minutes before

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In the hours before

Special weather statement, Jul 3, 11:26 AM CDT, 1 hour 23 minutes before

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Special weather statement, Jul 3, 11:57 AM CDT, 52 minutes before

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Special weather statement, Jul 3, 11:59 AM CDT, 50 minutes before

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Special weather statement, Jul 3, 12:08 PM CDT, 41 minutes before

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Special weather statement, Jul 3, 12:15 PM CDT, 34 minutes before

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Special weather statement, Jul 3, 12:40 PM CDT, 9 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
Jul 3, 7:10 AM CDT	Special Marine Warning	LIX		65 min
Jul 3, 8:32 AM CDT	Special Weather Statement	LIX	Plaquemines	28 min
Jul 3, 8:33 AM CDT	Special Marine Warning	LIX		57 min
Jul 3, 8:59 AM CDT	Special Marine Warning	LIX		46 min
Jul 3, 9:38 AM CDT	Special Marine Warning	LIX		67 min
Jul 3, 9:44 AM CDT	Special Marine Warning	LIX		61 min
Jul 3, 10:16 AM CDT	Special Weather Statement	LIX	East Feliciana, Pointe Coupee, West Feliciana	59 min
Jul 3, 10:20 AM CDT	Special Weather Statement	LIX	Plaquemines	25 min
Jul 3, 10:31 AM CDT	Special Weather Statement	LIX	Saint Charles	29 min
Jul 3, 11:03 AM CDT	Special Weather Statement	LIX	Saint Charles	57 min
Jul 3, 11:09 AM CDT	Areal Flood Advisory	LIX	Jefferson, Lafourche, Saint Charles	3 hr
Jul 3, 11:15 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Tangipahoa and 3 more	60 min
Jul 3, 11:26 AM CDT	Special Weather Statement	LIX	Lafourche	34 min
Jul 3, 11:30 AM CDT	Special Marine Warning	LIX		60 min
Jul 3, 11:31 AM CDT	Special Marine Warning	LIX		29 min
Jul 3, 11:39 AM CDT	Areal Flood Advisory	LIX	Jefferson, Lafourche	2 hr
Jul 3, 11:47 AM CDT	Special Marine Warning	LIX		58 min
Jul 3, 11:57 AM CDT	Special Weather Statement	LIX	Jefferson	33 min
Jul 3, 11:59 AM CDT	Special Weather Statement	LIX	Jefferson	31 min
Jul 3, 12:08 PM CDT	Special Weather Statement	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Pointe Coupee, Saint James and 3 more	37 min
Jul 3, 12:13 PM CDT	Special Marine Warning	LIX		32 min
Jul 3, 12:15 PM CDT	Special Weather Statement	LIX	Terrebonne	30 min
Jul 3, 12:37 PM CDT	Special Marine Warning	LIX		113 min
Jul 3, 12:40 PM CDT	Special Weather Statement	LIX	Ascension, Assumption, Iberville, Saint James, Saint John the Baptist, West Baton Rouge	65 min
Jul 3, 12:52 PM CDT	Special Marine Warning	LIX		53 min
Jul 3, 12:57 PM CDT	Areal Flood Advisory	LIX	Ascension, Lafourche, Saint Charles, Saint James, Saint John the Baptist	85 min
Jul 3, 1:05 PM CDT	Special Weather Statement	LIX	Orleans	40 min
Jul 3, 1:11 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Saint Charles	20 min
Jul 3, 1:49 PM CDT	Special Weather Statement	LIX	Terrebonne	56 min
Jul 3, 9:35 AM CDT	Special Weather Statement	LIX	Amite, Pike, Wilkinson	55 min

Nearby

Flash Flood Warnings in Louisiana, 2020 Every flash flood warning in 2020

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.