A parade of storms will bring rain and possible travel delays to San Francisco area through the weekend.
The first storm arrived on Wednesday with breezy conditions and a brief round of rain.
Heavier rain and stronger winds will arrive with a more potent storm today. Significant travel delays are anticipated.
According to Western Weather Expert Ken Clark, "Urban, stream and small river flooding are possible Friday into the weekend."
"This very well could end up being a very serious situation for some," Clark added.
Into the weekend, slower-moving storms will continue to unleash locally heavy rain over the area with a subtropical moisture supply.
"In the Santa Cruz Mountains, mountains in the North Bay region and in the foothills and mountains east of the Sacramento Valley and northern most San Joaquin Valley, I am expecting 8 to 12 inches with local amounts of 16 to 18 inches," Clark said.
Elsewhere, expect 2 to 4 inches of rain with local amounts of 5 or 6 inches.
Enough rain will fall to lead to mudslides and debris flows, especially in recent burn areas.
"Snow levels in the Sierra will be high, much of the time through Saturday night at, or above, 7,500 feet. Snow accumulations above 8,000 feet will be in many feet, probably 4 to 8 feet at least," Clark said.
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It will feel like the calendar has been turned back to winter instead of moving ahead to May as disruptive snow continues to sweep across the central United States into Monday.
Severe thunderstorms capable of causing property damage and flooding will continue to target communities from the southeastern United States to the Ohio Valley into Sunday night.
The temperature roller coaster ride in the northeastern United States will continue on Monday, setting the stage for severe thunderstorms over a part of the region.
After a dry and mild dry across the country on Sunday, rain and cooler air will return by May Day.
Despite flooding rain from this weekend departing by Monday, rivers across the central United States will continue to rise and threaten homes and residents this week.
While the recent cold snap will be over, bouts of rain will persist and threaten to disrupt outdoor plans across the United Kingdom during the bank holiday.
Dangerous thunderstorms and flash flooding will continue to threaten lives and property across the central United States through Saturday night.
While a storm will douse outdoor plans and lead to flooding on some of the Hawaiian Islands, enough rain may fall to ease drought conditions into the start of May.