Long Beach received a light dousing of rain on Wednesday, but the biggest storm is yet to come, with a 100% chance of rain expected to hit the area on Thanksgiving morning, according to the National Weather Service.

A storm out of the Gulf of Alaska invaded the Southland Wednesday and will bring rain, snow, and cold winds through Thanksgiving, while causing rough seas and wreaking havoc on the region’s roads, forecasters said.

As of 4 p.m. on Wednesday, Long Beach Airport had received .17 inches of rain. Showers and possibly a thunderstorm were expected throughout the day Thursday with winds gusts as high as 25 mph, according to the National Weather Service.

The rain could taper off by Thursday night or Friday morning, with a 40% chance of showers on Friday.

Temperatures will remain relatively low for the Southland, with highs in the low 60s.

Los Angeles County public health officials, meanwhile, have issued a beach water use advisory due to the rain, warning that storm runoff can carry bacteria, chemicals, debris and other health hazards into the ocean.

People are urged to avoid going into the water near storm drains, creeks and rivers. The advisory will be in effect until at least 9:30 a.m. Saturday.

– City News Service contributed to this report