Wet Pattern Settles In: Invest 90L Soaks Gulf Coast
Heavy Rain & Flood Threat for Louisiana and Mississippi
A tropical disturbance, designated Invest 90L, is moving into the Gulf Coast region, prompting flood advisories and concerns about flash flooding through the remainder of the week.
> "We could see rain rates over about five inches an hour sitting over you for about 30 minutes to an hour."
— WDSU Meteorologist Duncan
Immediate Impact
A flood advisory is currently in effect for portions of St. Tammany Parish, where nearly three inches of rain fell in just three hours. The heaviest activity is expected to impact the North Shore of Lake Pontchartrain on Tuesday morning, with the South Shore seeing less intense rainfall.
The Forecast
Timing and Totals
Rounds of heavy rain are expected on and off through the week. Forecasters predict 3 to 6 inches of rainfall, with locally higher amounts possible. The heaviest downpours may arrive on Thursday.
System Track
The disturbance may return to the Gulf late Tuesday into Wednesday, potentially drawing in additional moisture.
Development & Flood Risk
Development Potential
The National Hurricane Center gives Invest 90L a medium chance of development. However, wind shear is expected to hinder significant organization.
Flood Threat
- Today: Flash flood threat is possible across the region.
- Thursday: The threat shifts to likely for parts of the North Shore.
Residents are urged to stay weather-aware as conditions can change rapidly. Do not attempt to drive through flooded roadways.