Changes from previous update:
- 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:
- We are confident Marco will bring impacts to the local area
- We are confident Laura will bring some impacts to the local area, but less confident in the magnitude of imapcts
Impacts from Marco:
- Storm Surge
- 4 to 6 ft of inundation will be possible along immediate coastal areas from Morgan City to Ocean Springs
- 2 to 4 ft of inundation will be possible along the shores of Lakes Pontchartrain and Maurepas
- 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.
