King tides will hit San Diego beaches this weekend

Higher-than-normal (and lower-than-normal tides) are headed back to San Diego's coasts this weekend, according to NBC 7 meteorologists.

King tides — the phenomenon that describes what are typically some of the highest tides of the year — are happening Friday, Saturday and Sunday. These uniquely high tides are caused by a stronger-than-normal gravitational pull from the moon and sun .

On top of that, Friday's full moon is also a supermoon. This November full moon is known as the "Beaver Moon".

The highest tides of the month come during the full and new moon. A supermoon means that the moon is closer to earth than usual, further strengthening the moon's gravitational pull on earth's oceans, said NBC 7 meteorologist Greg Bledsoe.

On the mornings of Thursday, Friday, Saturday and Sunday, we'll have high tides or more than 7 feet. The two highest tides will be Friday and Saturday mornings, which will be the best times to see effects from the tides, according to Bledsoe.

Last year, San Diego County's coasts got some impressive coastal flooding during king tides and El Niño conditions. This time that's not likely to happen, Bledsoe added.

"This weekend, we are going to see some above average surf, but nothing like what we saw last winter when we had some huge winter surf that happened to come at the same time as a king tide," said Bledsoe.

Some coastal flooding is possible this weekend, but no coastal flood advisories have been issued thus far, Bledsoe said.

But it's still a great time to uncover what normally lies beneath the waves. Read on to find out more.

What is a king tide?

A king tide is an informal name for exceptionally high tides known as spring tides, caused by a stronger-than-normal gravitational pull from the moon and sun .

King tide events create a dramatic coastline, with not only the highest tides but also the lowest.

While king tides are known for being exceptionally high, low tides may provide the best opportunity for beachgoers. During these even lower tides, it may be possible to see even more creatures in tide pools and along the shoreline.

Some popular tide pool locations in San Diego are La Jolla Tide Pools, Cabrillo National Monument Tide Pools, Sunset Cliffs Natural Park, Dike Rock Tide pools, Cardiff State Beach Tide Pools and Swami's State Beach Tide Pools, although there's many more.

Why are king tides unusual?

While high tides occur twice a day, king tides occur only a few times a year when a new or full moon is closest to Earth during specific seasons. On the West Coast, they typically happen around the summer and winter solstice, the latter of which is on Dec. 21, according to the National Oceanic and Atmospheric Administration (NOAA).

An increase in the gravitational pull can be caused by different reasons, like when a supermoon is occurring. Other causes for even higher king tides could be storm surges or an El Niño event, which warms and expands ocean waters.

When can I see the king tides?

San Diego has several stations that report tides to NOAA. Here are the tide predictions from the Scripps Institution of Oceanography reporting station at the Scripps Pier in La Jolla:

Check the full calendar of tide predictions from NOAA here.

Check tide predictions for other parts of San Diego County by clicking here and selecting a reporting station closest to you.

Are king tides dangerous?

King tides are predictable, but they are often high enough to cause beach erosion, street flooding and flooding of some homes or businesses that are close enough to the coast. In the past, the very high tide has caused flooding in places like Imperial Beach and La Jolla Shores.

While king tides are not caused by sea-level rise, they can be "a good preview of what we may be dealing with more regularly in the future when the sea levels are higher," Bledsoe said. The city of San Diego is projected to see a rise between 1.2 and 2.8 feet by 2050.