Alert archive / Louisiana / Flash Flood Warnings in 2022

Flash Flood Warning 18, NWS New Orleans, LA

April 5, 2022Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; Amite County, Pike County, Walthall County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Apr 5, 2022, 10:11 AM CDT for Saint Helena Parish, Tangipahoa Parish, Washington Parish, Louisiana; Amite County, Pike County, Walthall County, Mississippi. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 5, 2022, 10:11 AM CDT (15:11 UTC)
Expired: Apr 5, 2022, 1:15 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties Saint Helena Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Pike County, MS, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.2 hours before the alert went out and 105 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: 1238 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 272 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 8.9

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 Apr 5, 5:19 AM CDT, 4 hours 52 minutes earlier.

Area forecast discussion, Apr 5, 5:19 AM CDT, 4 hours 52 minutes before

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In the hours before

Special weather statement, Apr 5, 7:46 AM CDT, 2 hours 25 minutes before

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Special weather statement, Apr 5, 7:52 AM CDT, 2 hours 19 minutes before

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Special weather statement, Apr 5, 8:40 AM CDT, 1 hour 31 minutes before

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Special weather statement, Apr 5, 9:04 AM CDT, 1 hour 7 minutes before

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Special weather statement, Apr 5, 9:30 AM CDT, 41 minutes before

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Special weather statement, Apr 5, 9:45 AM CDT, 26 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
Apr 4, 8:40 PM CDT	Special Weather Statement	LIX	Saint Charles	20 min
Apr 4, 9:48 PM CDT	Special Weather Statement	LIX	Saint Tammany	42 min
Apr 4, 10:01 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	29 min
Apr 5, 4:45 AM CDT	Special Weather Statement	LIX	Washington	45 min
Apr 5, 5:41 AM CDT	Special Weather Statement	LIX	East Feliciana	49 min
Apr 5, 6:51 AM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	39 min
Apr 5, 7:46 AM CDT	Special Weather Statement	LIX	Iberville	29 min
Apr 5, 8:40 AM CDT	Special Weather Statement	LIX	Livingston	35 min
Apr 5, 9:04 AM CDT	Special Weather Statement	LIX	Tangipahoa	26 min
Apr 5, 9:24 AM CDT	Flash Flood Warning	LIX	Saint Helena	2 hr
Apr 5, 9:30 AM CDT	Special Weather Statement	LIX	Washington	30 min
Apr 5, 10:39 AM CDT	Special Weather Statement	LIX	West Baton Rouge	36 min
Apr 5, 11:46 AM CDT	Special Marine Warning	LIX		59 min
Apr 5, 12:04 PM CDT	Flash Flood Warning	LIX	Livingston, Saint Helena, Saint Tammany, Tangipahoa, Washington	82 min
Apr 4, 10:43 PM CDT	Special Weather Statement	LIX	Hancock	47 min
Apr 5, 6:09 AM CDT	Special Weather Statement	LIX	Wilkinson	66 min
Apr 5, 7:17 AM CDT	Special Weather Statement	LIX	Pike, Walthall	43 min
Apr 5, 7:52 AM CDT	Special Weather Statement	LIX	Walthall	23 min
Apr 5, 9:45 AM CDT	Special Weather Statement	LIX	Pearl River	30 min
Apr 5, 10:18 AM CDT	Special Weather Statement	LIX	Pearl River	27 min
Apr 5, 11:48 AM CDT	Special Weather Statement	LIX	Jackson	27 min

Nearby

Flash Flood Warnings in Louisiana, 2022 Flash Flood Warnings in Mississippi, 2022 Every flash flood warning in 2022

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.