Heavy Rain and Coast Flood Update: April 12, 2023

Click HERE and HERE for an update concerning the heavy rain and coastal flood threats this week.

Overview:
WHAT: MINOR TO MODERATE COASTAL FLOODING & MARGINAL RISK of Heavy Rain

WHEN:

• For the heavy rain threat, mainly today through tonight.
• For the coastal flooding threat, around the time of high tide each day through at least Thursday. Tide levels will generally be highest this afternoon/evening except for areas inside Lake Pontchartrain where the highest levels may not be until Thursday night.

WHERE:

• For the heavy rain threat, most of southeast LA and southern MS, with the greatest threat across areas south of I-10.
• For the coastal flooding threat, all of coastal southeast LA and MS, with the greatest threat across east-facing shores from the mouth of the Mississippi River in Southeast LA through Hancock County in MS.

CONFIDENCE:

• For the heavy rain threat, low confidence due to uncertainties in where the low will eventually develop and move
• For the coastal flood threat, moderate to high confidence in both timing and magnitude

Impacts:
Coastal Flooding:

• Minor to moderate coastal flooding is expected, with 1 to 3 ft of inundation possible around the time of high tide
• Low lying coastal roads, parking lots and sidewalks may become covered in water. A few roads may become impassable in areas with the greatest impacts.

Heavy Rainfall/Flash Flooding:

• Heavy rain could lead to localized flash flooding threats
• 1-3" of rain is currently forecast for areas generally south of I-10.
• This threat remains highly dependent on where the low eventually develops and moves

Marine Impacts:

• Gusty winds and elevated waves/seas are likely, with Small Craft Advisories and Gale Warnings in effect.