Alert archive / Louisiana / Flash Flood Warnings in 2026

Flash Flood Warning 23, NWS New Orleans, LA

May 1, 2026Jefferson Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 1, 2026, 3:20 PM CDT for Jefferson Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 2 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: May 1, 2026, 3:20 PM CDT (20:20 UTC)
Expired: May 1, 2026, 5:23 PM CDT
In force: 2 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

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

The radar

The Hammond radar (KHDC), 69 km from the middle of the area, began a volume at 20:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.3 hours before the alert went out and 70 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: 42 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 576 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 May 1, 1:35 PM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, May 1, 1:35 PM CDT, 1 hour 45 minutes before

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In the hours before

Special weather statement, May 1, 12:22 PM CDT, 2 hours 58 minutes before

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Special weather statement, May 1, 2:12 PM CDT, 1 hour 8 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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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 30, 7:16 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines, Saint Bernard	17 min
Apr 30, 7:22 PM CDT	Special Weather Statement	LIX	Lafourche	53 min
Apr 30, 7:34 PM CDT	Special Weather Statement	LIX	Jefferson	26 min
May 1, 1:35 AM CDT	Small Craft Advisory	LIX		53 hr
May 1, 7:24 AM CDT	Special Marine Warning	LIX		36 min
May 1, 7:59 AM CDT	Special Marine Warning	LIX		28 min
May 1, 9:52 AM CDT	Special Marine Warning	LIX		68 min
May 1, 10:50 AM CDT	Special Marine Warning	LIX		55 min
May 1, 11:00 AM CDT	Special Marine Warning	LIX		45 min
May 1, 11:23 AM CDT	Special Marine Warning	LIX		29 min
May 1, 11:26 AM CDT	Special Marine Warning	LIX		49 min
May 1, 12:03 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche	44 min
May 1, 12:05 PM CDT	Special Marine Warning	LIX		55 min
May 1, 12:22 PM CDT	Special Weather Statement	LIX	Lafourche	23 min
May 1, 1:42 PM CDT	Special Marine Warning	LIX		33 min
May 1, 2:12 PM CDT	Special Weather Statement	LIX	Plaquemines	18 min
May 1, 2:13 PM CDT	Areal Flood Advisory	LIX	Ascension, Iberville, Saint James	3 hr
May 1, 2:54 PM CDT	Areal Flood Advisory	LIX	Jefferson, Saint Charles	3 hr
May 1, 3:23 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Saint Bernard	3 hr
May 1, 4:05 PM CDT	Areal Flood Advisory	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	3 hr
May 1, 6:24 PM CDT	Special Marine Warning	LIX		51 min

Nearby

Flash Flood Warnings in Louisiana, 2026 Every flash flood warning in 2026

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; radar from the NEXRAD Level II archive.