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Storm to bring threats of coastal flooding

Heavy rain from Thursday's storm is expected to bring high surf and high tides in coastal areas that could bring beach erosion.

SAN DIEGO — A powerful winter storm is expected to bring in some of the biggest waves San Diego has seen in years. 

The National Weather Service is predicting waves up to 16 feet, but that kind of hit could cause coastal flooding and even mudslides.

Dangerously large breaking waves and coastal flooding, that's what beach neighborhoods like mission beach could expect as Thursday's storm sweeps through the county.

“Big storm is generating big surf up and down the whole entire coastline. This could be the biggest swell we’ve had in 10-years,” said Lieutenant Rick Romero with the San Diego Lifeguards.

San Diego lifeguards say it's hard to tell what will happen tomorrow, but possible flooding on the boardwalk and in other areas of the beach and bay are expected.

Extreme tides like these can easily cause backup in the San Diego River which can then cause backflow and lead to major flooding–especially in areas like Mission Valley. 

“We have about a 7 foot tide with a full moon on Friday, so that’s early morning hours so that just backs up water, all the water coming tonight might be slow because the tides not going out so it just backs up that's when you see a little more of a backflow in the waterways,” said Romero.

For experienced surfers these high tides might be exactly what they need, however, officials are strongly recommending those who are not as experienced to stay home.

They also add that simply getting to the waves will be difficult.

“The biggest thing is the rock areas, if you are walking around and want to watch the surf that’s great, but kind of watch the area. Are all rocks all wet because we will get big giant surges,” said Romero. 

Another area of concern for anyone trying to surf, the water quality because of runoff. Swimming and surfing is not advised for at least 72 hours after it rains.

As far as other potential flooding–officials remind drivers to slow down on these wet roads. Avoid driving into flooded areas that seem to be six inches or more of water.

High surf warnings and flood advisories will go in effect in coastal areas beginning Thursday at 12 p.m. into Friday.

WATCH RELATED: Newsom declares state of emergency as major storm impacts California (Jan. 2023).

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