A Pacific storm system known as the “Pineapple Express” threatened to dump up to 8 ins of rain and 8 ft of snow on areas of California, raising risks of flooding and mudslides, meteorologists said Wednesday.
“The Pineapple Express is no joke,” said a meteorologist with the National Weather Service’s Weather Prediction Center in College Park, Maryland of the strongest weather system of the season.
The weather system, also known as an atmospheric river, gets its name from the flow of moisture that periodically heads east from waters adjacent to the Hawaiian Islands to soak the US Westsoast. It blanketed parts of Hawaii with snow over the weekend and is expected to drench California.
The San Francisco Bay area could be hit by flash flooding and falling trees as saturated ground gets up to 8 ins more rain and strong winds blow in, the weather service said.
“We’re talking 3 to 5 ins of rain in San Francisco and coastal areas in just the next 24 hours, and more on into Friday,” he said.
To the northeast in the Sierra Nevada Mountains, passes could see approximately 7 to 8 ft of snow through Friday.
Valley areas face flood watches over fears the relatively warm Pineapple Express system could initially drench areas as high as Lake Tahoe with rain, melting snow and swelling rivers.
The Central and Southern California coast can expect flash flooding and possible mudslides near recent wildfire burn areas, the NWS reported.
The problem is not just the amount of rain, but the fact that it will hit in a short amount of time.
“It’s going to be heavy and fast,” he said. “Debris flows and mud slides are a risk in any area scorched by the wildfires. There’s little to no vegetation to slow that water down.”
Up to 2 ins of rain was expected in the Los Angeles area between Wednesday and Thursday morning, the weather service said.
A string of winter storms has swelled snowpack in California to above-average levels, delighting farmers in need of water and skiers in search of powder.
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