• No significant changes to Marco's forecast impacts

• TS Laura's forecast track has shifted west again

Overview:

• Tropical Storm Marco is forecast to become a hurricane and make landfall in southeast Louisiana Monday

• Tropical Storm Laura's forecast to be at least a category two as it approaches the coast on Wednesday

Confidence:

Impacts from Marco:

• Rainfall

  • Rainfall of 2 to 4 inches is currently forecast. Locally higher amounts of double or more will be possible

  • Expect ponding of water in low lying areas and some potential for localized flash flooding

  • A Flash Flood Watch is in effect for the lower parishes of southeast Louisiana. This watch may be expanded, depending on future track adjustments.

• Wind

  • Sustained hurricane force winds will be possible, mainly across a small area near Marco's core.

  • Tropical storm force winds will be more widespread.

  • These winds could result in minor damage mainly to trees, powerlines, and weaker structures. 

• Tornadoes

  • Short-lived and fast-moving tornadoes can occur in Marco's outer bands as it moves ashore and inland.

• Other Considerations:

  • TS Laura could bring stronger winds, higher inundation and additional heavy rainfall to portions of the area, however this is low confidence at this point given the westward shift in the track.

  • Keep in mind that preparation for TS Laura may be made more difficult by lingering impacts from TS Marco.

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/