Tropical Storm Ida Briefing August 27, 2021 At 11 AM

Click HERE for an update concerning Tropical Storm Ida.

Changes from the last update:

• A slight shift in the forecast track to the west.
• Added a Flash Flood Watch for today as very heavy rain is coming in off of the Gulf of Mexico (additional Flash Flood Watches will likely be issued later)

Overview:

• Tropical Depression Nine will continue northwest with strengthening expected before entering the Southeastern Gulf late Friday or early Saturday.
• This system is expected to continue northwest and is currently forecast to impact portions of the northern Gulf coast Sunday through early Monday.

Confidence:

• There is high confidence in the forecast track and intensity of this system; moderate confidence with timing.

Impacts:

Winds

• Hurricane-force winds (>74mph) will be possible for our entire area
• Strong hurricane-force winds (>110mph) will be possible for portions of our area, including Metro New Orleans, Metro Baton Rouge and all coastal LA parishes

Storm Surge

• Storm Surge values have increased since the last advisory
• 7-11ft of inundation from Morgan City to Ocean Springs
• 4-7ft  of inundation Ocean Springs to the AL border
• 4-6ft  of inundation Lake Pontchartrain
• 3-5ft  of inundation Lake Maurepas

Rainfall/Inland Flooding

• 8-16" of rain is possible across our forecast area with isolated higher amounts of 20" possible 
• The heaviest rainfall will be possible Sunday and Monday

Tornadoes

• There is a risk of weak/short-lived tornadoes across SE LA and S MS

The attached briefing highlights the threats associated with this system.

Additional Information and Resources:

NWS New Orleans Website: www.weather.gov/neworleans

NWS New Orleans DSS Website: http://www.weather.gov/lix/embrief

NWS New Orleans Tropical Page: https://www.weather.gov/srh/tropical?office=lix

River Gauges and Forecasts: http://water.weather.gov/ahps2/index.php?wfo=lix

NWS New Orleans Facebook: www.facebook.com/NWSNewOrleans

NWS New Orleans Twitter: https://twitter.com/NWSNewOrleans

Online Severe Weather Reporting: https://www.weather.gov/lix/submit_storm_report

National Hurricane Center Website: https:///www.nhc.noaa.gov

Next Update and Contact Information:

The next update will be following the 4 PM CDT NHC update, earlier if there are any significant changes.

If you have any questions in the interim or need additional information, please do not hesitate to contact us.  We can be reached by phone at 504-522-7330 or 985-649-0429.  Use extension 4 to speak with a forecaster.  Alternatively, you can reach us by email by replying to this message or sending an email to sr-lix.forecasters@noaa.gov. Both methods will be delivered to the forecasters on shift at the office.

Regards,
Megan Williams
Meteorologist
LIX New Orleans/Baton Rouge, LA