Northern California

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Northwestern Alameda County north of downtown Oakland, western Contra Costa County and southern Marin County. * WHEN...Until 515 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Water over roadways. * ADDITIONAL DETAILS... - At 1115 PM PST, Doppler radar and automated rain gauges indicated heavy rain. This will cause urban and small stream flooding. Up to 1 inch of rain has fallen. - Several flooding reports are already coming in from Contra Costa County. Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Concord, Berkeley, Richmond, Mountain View, Walnut Creek, Martinez, Pleasant Hill, San Pablo, Lafayette, El Cerrito, Hercules, Albany, Pinole, Orinda, Moraga, Mill Valley, Larkspur, Piedmont and Emeryville. - http://www.weather.gov/safety/floodMore

* WHAT...Urban area and small stream flooding caused by excessive rainfall continues. * WHERE...Areas near Calistoga, St. Helena, Yountville, Lake Berryessa, and the city of Sonoma in northeastern Sonoma and northern and central Napa counties. * WHEN...Until 215 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 1026 PM PST, Doppler radar and automated rain gauges indicated heavy rain. This will cause urban and small stream flooding. Between 3 and 5 inches of rain have fallen. - Additional rainfall amounts of 0.5 to 1.5 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Napa, Sonoma, St. Helena, Calistoga, Boyes Hot Springs, Yountville, Angwin, Deer Park, Glen Ellen, Eldridge, Fetters Hot Spring, Fetters Hot Springs-Agua Caliente, El Verano and Temelec. - http://www.weather.gov/safety/floodMore

* WHAT...Urban area and small stream flooding caused by excessive rainfall is ongoing. * WHERE...Northern and central Sonoma County, including the Sonoma coastal ranges, the 101 corridor including the city of Santa Rosa, and the Mayacamas. * WHEN...Until 315 AM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 919 PM PST, Doppler radar and automated rain gauges indicated heavy rain. This is causing urban and small stream flooding. Between 3 and 6 inches of rain have fallen. - Colgan Creek, Santa Rosa Creek, and Laguna de Santa Rosa are experiencing minor flooding, and the risk for minor flooding remains along Green Valley Creek. Roads have been closed due to flooding. Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Santa Rosa, Rohnert Park, Windsor, Healdsburg, Cloverdale, Sebastopol, Cotati, Larkfield-Wikiup, Roseland, South Santa Rosa Cdp, Forestville, Guerneville, Monte Rio, Graton, Occidental and South Santa Rosa. - http://www.weather.gov/safety/floodMore

* WHAT...Urban area and small stream flooding caused by excessive rainfall is expected. * WHERE...Most of Marin County and southern Sonoma County, including the cities of San Rafael and Petaluma. * WHEN...Until 130 AM PST Thursday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. * ADDITIONAL DETAILS... - At 726 PM PST, Doppler radar and automated rain gauges indicated heavy rain. This will cause urban and small stream flooding. Between 1 and 3 inches of rain have fallen. - Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Petaluma, San Rafael, Novato, Mill Valley, San Anselmo, Larkspur, Corte Madera, Fairfax, Cotati, Point Reyes Station, San Geronimo, Tomales, Lucas Valley-Marinwood, Dillon Beach, Black Point-Green Point, Kentfield, Ross, Inverness, Lagunitas-Forest Knolls and Woodacre. - http://www.weather.gov/safety/floodMore

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...The North Bay. * WHEN...Through late Friday night. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. * ADDITIONAL DETAILS... - Light to moderate rain is continuing across the watch area. Two to four inches of rain have already fallen in the valley regions with up to six inches of rain in the higher elevations. Areas of the Sonoma County valleys have already reported minor flooding and road closures. - http://www.weather.gov/safety/floodMore

* WHAT...Large breaking waves between 14 to 19 ft along southwest facing beaches and between 19 to 22 ft along well exposed west facing beaches. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...Until 6 AM PST Friday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.More

* WHAT...A moderate period northwest swell will result in a more energetic surf zone and an increased risk of sneaker waves and rip currents. Breaking waves of 10 to 13 ft are expected with some potential for breaking waves up to 15 ft to develop. * WHERE...Northern Monterey Bay County. * WHEN...Through late Thursday night. * IMPACTS...Dangerous swimming and surfing conditions. Large waves can sweep across the beach without warning, pulling people into the sea from rocks, jetties, and beaches. Sudden immersion in cold water can result in cold water shock even for the most experienced swimmers. Cold water shock can result in dramatic changes in breathing, heart rate and blood pressure, greatly increasing the risk of drowning in rough open waters.More

* WHAT...South winds 20 to 30 mph with gusts up to 50 mph. * WHERE...San Francisco, Marin Coastal Range, Sonoma Coastal Range, North Bay Interior Mountains, North Bay Interior Valleys, San Francisco Bay Shoreline, San Francisco Peninsula Coast * WHEN...Until 6 AM PST Thursday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.More