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Atmospheric river coming to the Bay Area this weekend

Also, flash flood watch issued for Santa Cruz Mountains, CZU burn scar

Caltrain commuters head to the northbound side of the train tracks at the California Avenue Caltrain station on May 15, 2019. Photo by Veronica Weber.

The National Weather Service forecasted more rain to arrive in the Bay Area late Thursday and into Friday, but the biggest rainfall amounts are expected on Sunday into Monday via an "atmospheric river" that could bring up to 9 inches of rain to some elevated parts of the region.

Forecasters said the rain coming through Thursday night into Friday afternoon will affect the north bay more than other parts of the Bay Area, with areas south of the Golden Gate Bridge not expected to get more than a half-inch of rain from the storm.

Southerly winds of 30-40 mph with gusts up to 50 mph along the coast and higher elevations could blow through the region, according to the weather service.

However, the most serious storm will come this weekend, with the atmospheric river possibly bringing 6 to 9 inches of rain in areas like the north bay mountains and up to 3 inches in other parts of the region.

Flooding is possible as a result of the weekend storm in areas with poor drainage, but forecasters said the weather system is still too far away to make more exact predictions.

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The major weather system this weekend will also bring major waves along the coast, with swells as high as 20 to 30 feet coming starting Sunday and peaking Monday into Tuesday, according to the weather service.

As a result, agency officials said a high surf advisory or warning could be issued as soon as Friday, and people are advised to keep an eye out for rip tides and sneaker waves as well as hazardous conditions for small vessels on the water.

Flash flood watch issued

The National Weather Service on Friday issued a flash flood watch for parts of the region, particularly areas that burned in wildfires last year.

The flood watch will be in effect from 5 a.m. to 11 p.m. Sunday in the North Bay, 1 p.m. to 11 p.m. in the Santa Cruz Mountains, and 5 p.m. Sunday to 4 a.m. Monday in Monterey County, according to the weather service.

Heavy rainfall -- forecasters are predicting several inches of rain Sunday and Monday in some areas -- could lead to debris flows and flash floods, particularly in areas that burned in fires sparked by lightning storms in August 2020.

Jonathan Cox, deputy chief of Cal Fire's San Mateo Division, said Friday that rainy weather coming through the region this past week has helped quell immediate concerns over any new major wildfires starting and "is very welcome for a lot of reasons."

However, the burn scars from the CZU Lightning Complex fires in San Mateo and Santa Cruz counties last year are among the areas under the flood watch as the larger storm descends on the region this weekend.

"It's good news for the fact that it will reduce the wildfire risk, but any change in the weather will have another set of risks," Cox said.

Cal Fire and other first responder agencies in the two counties are encouraging people to check Zonehaven, a platform that helps communicate real-time evacuation information to the public and divides areas into evacuation zones. People can look up their address to find out their zone at community.zonehaven.com.

Along with knowing their evacuation zone, Cox recommended that people in both San Mateo and Santa Cruz counties sign up for their respective county's emergency alert systems to receive text or voice messages in the event of an emergency.

San Mateo County residents can sign up for SMC Alert at hsd.smcsheriff.com/smcalert and Santa Cruz County residents can sign up for CodeRED, their agency's alert system, at scr911.org.

Sandbags are available for pickup 24/7 for unincorporated San Mateo County residents at the following locations, free of charge (limit 15):

• Grant corporation yard: 752 Chestnut Road, Redwood City; 650-363-4103.

• La Honda corporation yard: 59 Entrada Way, La Honda; 650-747-0341.

For storm preparedness tips and information on the proper use of sandbags, visit publicworks.smcgov.org/storm-preparedness.

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Atmospheric river coming to the Bay Area this weekend

Also, flash flood watch issued for Santa Cruz Mountains, CZU burn scar

by /

Uploaded: Fri, Oct 22, 2021, 9:40 am
Updated: Fri, Oct 22, 2021, 5:14 pm

The National Weather Service forecasted more rain to arrive in the Bay Area late Thursday and into Friday, but the biggest rainfall amounts are expected on Sunday into Monday via an "atmospheric river" that could bring up to 9 inches of rain to some elevated parts of the region.

Forecasters said the rain coming through Thursday night into Friday afternoon will affect the north bay more than other parts of the Bay Area, with areas south of the Golden Gate Bridge not expected to get more than a half-inch of rain from the storm.

Southerly winds of 30-40 mph with gusts up to 50 mph along the coast and higher elevations could blow through the region, according to the weather service.

However, the most serious storm will come this weekend, with the atmospheric river possibly bringing 6 to 9 inches of rain in areas like the north bay mountains and up to 3 inches in other parts of the region.

Flooding is possible as a result of the weekend storm in areas with poor drainage, but forecasters said the weather system is still too far away to make more exact predictions.

The major weather system this weekend will also bring major waves along the coast, with swells as high as 20 to 30 feet coming starting Sunday and peaking Monday into Tuesday, according to the weather service.

As a result, agency officials said a high surf advisory or warning could be issued as soon as Friday, and people are advised to keep an eye out for rip tides and sneaker waves as well as hazardous conditions for small vessels on the water.

The National Weather Service on Friday issued a flash flood watch for parts of the region, particularly areas that burned in wildfires last year.

The flood watch will be in effect from 5 a.m. to 11 p.m. Sunday in the North Bay, 1 p.m. to 11 p.m. in the Santa Cruz Mountains, and 5 p.m. Sunday to 4 a.m. Monday in Monterey County, according to the weather service.

Heavy rainfall -- forecasters are predicting several inches of rain Sunday and Monday in some areas -- could lead to debris flows and flash floods, particularly in areas that burned in fires sparked by lightning storms in August 2020.

Jonathan Cox, deputy chief of Cal Fire's San Mateo Division, said Friday that rainy weather coming through the region this past week has helped quell immediate concerns over any new major wildfires starting and "is very welcome for a lot of reasons."

However, the burn scars from the CZU Lightning Complex fires in San Mateo and Santa Cruz counties last year are among the areas under the flood watch as the larger storm descends on the region this weekend.

"It's good news for the fact that it will reduce the wildfire risk, but any change in the weather will have another set of risks," Cox said.

Cal Fire and other first responder agencies in the two counties are encouraging people to check Zonehaven, a platform that helps communicate real-time evacuation information to the public and divides areas into evacuation zones. People can look up their address to find out their zone at community.zonehaven.com.

Along with knowing their evacuation zone, Cox recommended that people in both San Mateo and Santa Cruz counties sign up for their respective county's emergency alert systems to receive text or voice messages in the event of an emergency.

San Mateo County residents can sign up for SMC Alert at hsd.smcsheriff.com/smcalert and Santa Cruz County residents can sign up for CodeRED, their agency's alert system, at scr911.org.

Sandbags are available for pickup 24/7 for unincorporated San Mateo County residents at the following locations, free of charge (limit 15):

• Grant corporation yard: 752 Chestnut Road, Redwood City; 650-363-4103.

• La Honda corporation yard: 59 Entrada Way, La Honda; 650-747-0341.

For storm preparedness tips and information on the proper use of sandbags, visit publicworks.smcgov.org/storm-preparedness.

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