CALIFORNIA BOAT LAUNCHES

* WHAT...Heavy snow expected. Total snow accumulations up to 5 feet. Winds gusting as high as 45 mph. * WHERE...A portion of central California. * WHEN...From 1 AM Saturday to 10 AM PST Monday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning commute. Gusty winds could bring down tree branches.

* WHAT...Heavy snow expected above 5000 feet. Total snow accumulations of 1 to 2 feet above 5000 feet, with 2 to 5 feet above 6000 feet. Locally higher amounts at highest peaks. Winds gusting as high as 55 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...From 10 PM this evening to 4 PM PST Monday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact this evening through Monday morning commutes. Strong winds could cause tree damage. * ADDITIONAL DETAILS...Snow levels 6500-7500 feet tonight into Saturday morning, lowering to 5000 to 6000 feet Saturday afternoon into Sunday, and further to around 4500 to 5500 feet by early Monday morning. Heaviest snow expected on Sunday.

* WHAT...Heavy snow possible above 5,000 feet. Total snow accumulations between 12 and 17 inches possible. Winds could gust as high as 55 mph. * WHERE...Northern Trinity county. Hwy 3 at Scott Mountain pass may be impacted. * WHEN...From Saturday morning through Monday afternoon. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult to impossible. Tire chains may be necessary if travelling through mountain passes. Strong winds could cause extensive damage to trees and power lines.

* WHAT...South winds 30 to 40 mph with gusts up to 70 mph expected. Locally stronger over the higher terrain. * WHERE...Higher elevations of interior Humboldt, including Kneeland. * WHEN...Until 10 PM PST this evening. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. Wind gusts will be particularly strong along windward ridges and exposed coastal headlands. There is an increased risk of tree branches and other debris on roadways.

* WHAT...For the Wind Advisory, south winds 20 to 30 mph with gusts up to 50 mph expected. For the High Wind Watch, south winds 25 to 35 mph with gusts up to 60 mph possible. * WHERE...Del Norte County. * WHEN...For the Wind Advisory, until 10 AM PST Saturday. For the High Wind Watch, from Saturday morning through Sunday morning. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. Wind gusts will be particularly strong along windward ridges and exposed coastal headlands.

* WHAT...South winds 25 to 35 mph with gusts up to 70 mph. * WHERE...Southwestern Humboldt around Cape Mendocino. * WHEN...Until 7 AM PST Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. Wind gusts will be particularly strong along windward ridges and exposed coastal headlands. There is an increased risk of tree branches and other debris on roadways.

* WHAT...For the Storm Warning, southeast winds 30 to 40 kt with gusts up to 55 kt and seas 9 to 14 feet. For the Gale Warning, south winds 25 to 30 kt with gusts up to 40 kt and seas 11 to 16 feet expected. For the Storm Watch, south winds 30 to 40 kt with gusts up to 50 kt and seas 14 to 19 feet possible. * WHERE...Pt St George to Cape Mendocino 10 to 60 nm. * WHEN...For the Storm Warning, until 11 PM PST this evening. For the Gale Warning, from 11 PM this evening to 7 AM PST Saturday. For the Storm Watch, from Saturday morning through Saturday evening. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.

* WHAT...For the Gale Warning, south winds 20 to 30 kt with gusts up to 45 kt and seas 7 to 10 feet. For the Storm Watch, south winds 25 to 35 kt with gusts up to 50 kt and seas 10 to 15 feet possible. * WHERE...Pt St George to Cape Mendocino out 10 nm. * WHEN...For the Gale Warning, until 7 AM PST Saturday. For the Storm Watch, from Saturday morning through Saturday evening. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.

* WHAT...For the Storm Warning, southeast winds 30 to 40 kt with gusts up to 55 kt and seas 9 to 14 feet. For the Gale Warning, south winds 25 to 30 kt with gusts up to 40 kt and seas 11 to 16 feet expected. For the Storm Watch, south winds 30 to 40 kt with gusts up to 50 kt and seas 14 to 19 feet possible. * WHERE...Pt St George to Cape Mendocino 10 to 60 nm. * WHEN...For the Storm Warning, until 11 PM PST this evening. For the Gale Warning, from 11 PM this evening to 7 AM PST Saturday. For the Storm Watch, from Saturday morning through Saturday evening. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.

* WHAT...For the Storm Warning, southeast winds 30 to 40 kt with gusts up to 55 kt and seas 13 to 15 feet. For the Gale Warning, south winds 25 to 35 kt with gusts up to 45 kt and seas 13 to 18 feet expected. * WHERE...Cape Mendocino to Pt Arena 10 to 60 nm. * WHEN...For the Storm Warning, until 11 PM PST this evening. For the Gale Warning, from 11 PM this evening to 11 PM PST Saturday. * IMPACTS...Very strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.

* WHAT...For the Coastal Flood Warning, High astronomical tides and large surf will cause major flooding in low lying areas along the North Coast. Up to 1.5 foot of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. Between 8.6 and 8.9 feet MLLW at the Arena Cove gauge is predicted. Between 9.2 and 9.5 feet MLLW at the Crescent City tide gauge is predicted. For the Coastal Flood Watch, High astronomical tides and large surf may cause moderate to major flooding in low lying areas along the Redwood and Mendocino Coast. Up to 1.5 foot of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. * WHERE...Coastal Del Norte, Southwestern Humboldt and Mendocino Coast Counties. * WHEN...For the Coastal Flood Warning, from 9 AM to 1 PM PST Saturday. For the Coastal Flood Watch, from Sunday morning through Sunday afternoon. High tide is at 10:35 AM at the Cescent City tide gauge. High tide is at 9:51 AM at the Arena Cove tide gauge. Saltwater inundation will be possible 1 to 2 hours before and after high tide. * IMPACTS...Several coastal roads may be closed. Low lying property and some critical infrastructure will be inundated. These impacts will include, but not limited to, imapcts on sections of highway 1/101. Shoreline erosion will occur.

* WHAT...For the Coastal Flood Warning, High astronomical tides and large surf will cause major flooding in low lying areas around Humboldt Bay. Up to 1.5 feet of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. Between 9.9 and 10.2 feet MLLW at the north spit tide gauge is predicted. is predicted. For the Coastal Flood Watch, High astronomical tides and large surf may cause major flooding in low lying areas around Humboldt Bay. Up to 1.5 feet of saltwater inundation above ground level is possible in low lying areas near shorelines and tidal waterways. * WHERE...Around Humboldt Bay. * WHEN...For the Coastal Flood Warning, from 9 AM to 1 PM PST Saturday. For the Coastal Flood Watch, from Sunday morning through Sunday afternoon. High tide is at 10:45 AM at the Humboldt Bay North Spit tide gauge. Saltwater inundation will be possible 1 to 2 hours before and after high tide. * IMPACTS...Several coastal roads may be closed. Low lying property and some critical infrastructure will be inundated. These impacts will include, but not limited to, roadways in King Salmon and the Arcata bottoms Shoreline erosion will occur.

Rain is expected to start in the south this afternoon and spread north this evening and overnight. A second round of rain will pick up Saturday during the day and this will be heavier. * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northern Humboldt Coast, Northern Humboldt Interior, Northern Lake, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Lake, Southern Trinity, Southwestern Humboldt and Southwestern Mendocino Interior. * WHEN...Through Sunday evening. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Storm drains and ditches may become clogged with debris. * ADDITIONAL DETAILS... - Widespread moderate to heavy rain from two consecutive strong weather systems will produce 2-4 inches of rainfall Friday afternoon through late Sunday. - http://www.weather.gov/safety/flood

Rain is expected to start in the south this afternoon and spread north this evening and overnight. A second round of rain will pick up Saturday during the day and this will be heavier. * WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northwest California, including the following areas, Coastal Del Norte and Del Norte Interior. * WHEN...From Saturday morning through Sunday afternoon. * IMPACTS...There will be an increased risk of rock and land slides along roadways. Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Additional rounds of heavy rain are likely again starting today and continuing through Friday night. An additional 3-6, locally up to 9 inches of total precipitation is possible through Friday. There will be breaks in the heavy precipitation, but heavy rain falling on already saturated ground will promote flooding impacts. The more widespread moderate to heavy precipitation will not arrive until Tuesday afternoon. - http://www.weather.gov/safety/flood

* WHAT...For the Coastal Flood Warning, significant coastal flooding expected due to high astronomical tides and storm surge. Up to 2.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways during the morning high tide Saturday. For the Coastal Flood Advisory, up to 2.0 ft inundation is possible. * WHERE...San Francisco and San Pablo Bays. * WHEN...For the Coastal Flood Warning, from 7 AM Friday to 2 PM PST Saturday. For the Coastal Flood Advisory, from 2 PM Saturday to 2 PM PST Sunday. * IMPACTS...Numerous roads will be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3 1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include up to 1.3 feet of storm surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of central California, including the following areas, Fresno-Tulare Foothills, Fresno-Tulare Lower Sierra, Mariposa Madera Foothills, Mariposa-Madera Lower Sierra, San Joaquin River Canyon, South End Sierra Foothills, South End of the Lower Sierra and Yosemite Valley. * WHEN...From this evening through Monday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

An Atmospheric River Event will bring moderate to heavy rain this evening through Monday evening. The prolonged period of rain will bring the risk of flooding to the Sacramento Valley, Shasta County, northern Sierra Nevada and adjacent foothills, as well as the Coastal Range. This will be for elevations below 4000 feet. * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of northern California below 4000 feet in elevation, including the following areas, Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, and Shasta Lake Area / Northern Shasta County. * WHEN...From this evening through Monday afternoon. * IMPACTS...Excessive runoff will result in rises along area rivers, creeks, streams. Small streams and creeks may rise out of their banks. Flooding may occur in low-lying, poor drainage, and urban areas. Mudslides and rockslides may occur in mountain and foothill areas. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood