Tropical Storm Laura emerges as biggest threat while Marco weakens

Marco has weakened as a remnant low but will still produce some showers and thunderstorms Tuesday across the Gulf Coast and Southeast.

Tropical Storm Laura is now the biggest threat as the system is forecast to become a major hurricane in the next 24 to 48 hours before it makes landfall Wednesday night or Thursday morning, with significant impacts expected from Southeast Texas into Southwest Louisiana.

Life-threatening storm surge, hurricane-force winds, heavy rainfall, inland flooding and tornadoes will all be a danger as Laura moves close to the U.S. coast.

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The hazards from Laura will extend well away from the center of the storm, so all interests along the Gulf Coast need to pay close attention to the path of this system and listen to their local officials for guidance on safety measures in advance of the storm.

In other weather news, wildfire danger remains high over parts of the West. Lightning strikes could worsen the danger as above-average temperatures remain a concern for much of the region with very little rainfall.

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A heat wave is also happening from the Northern High Plains into the Midwest and Great Lakes with record highs possible.

Strong to severe thunderstorms are forecast ahead of a cold front over the Northeast and MidAtlantic. Very gusty winds could cause damage and power outages.

Fox News' Greg Norman contributed to this report.