SAN DIEGO (KGTV) -- San Diego could see as much as three inches of rain and other parts of the county could see 10 as an atmospheric river moves through Southern California.
The storm is set to douse San Diego County with rain Wednesday and Thursday.
“(Thursday) will be an all day rain event with steady heavy rain much of the day,” according to the 10News Pinpoint Weather Team.
According to the National Weather Service, flash flooding, mudslides and debris flows are likely. “Coastal mountain slopes will see the greatest amount of flooding,” the agency continued.
Extensive road and parking lot flooding is also expected, especially near riverbeds and low-lying areas.
A flash flood watch is in effect Thursday from 4 a.m. to 10 p.m. from the coast to the mountains.
RELATED: Full San Diego County forecast
A flood warning is in effect for the San Diego River in Fashion Valley and the Santa Margarita River in San Ysidro.
Due to the heavy rain, SeaWorld San Diego announced that the park would be closing Thursday, but plans to re-open Friday.
Heavy winds will also accompany the storm, with a high wind warning in effect for San Diego County’s mountains through Saturday at 4 a.m.
Though this storm is set to carry lots of moisture through the county, snow isn't expected in the mountains.
"This will be a warm storm with very high snow levels, so no snow is expected in the mountains with this storm," 10News Meteorologist Megan Parry said.
We talked to the City of San Diego and they said they're in full storm preparation mode. They've been watching the radar and forecast and say they are concerned about this storm event.
The city is using bypass pumps to remove water from flooded areas to other storm drains. Crews are also on standby in case of any non-life threatening emergencies.
The City of San Diego spokesperson Anthony Santacroce says, "We’re concerned about the storm and take it seriously. This is an intense storm.”