Storm Advisory

The National Weather Service has announced hazardous weather outlook for the North Bay. 

A late season storm system with unseasonably high moisture content will bring periods of rain, possibly heavy at times, to our area today and tomorrow. Light rain is forecast to develop in the North Bay by Thursday afternoon. Rainfall intensity through Thursday night is expected to be light to moderate.

Rainfall intensity is forecast to increase on Friday and rain rates could be heavy at times by Friday afternoon. Periods of heavy rain are then possible through Friday night and into early Saturday morning. Rainfall is expected to taper off by midday Saturday.

Rainfall totals from late Thursday through midday Saturday are forecast to range from 2 to 4 inches across the North Bay, except 4 to 6 inches in the North Bay Mountains. Local amounts of more than 6 inches are possible in the wettest locations of the North Bay Mountains and Santa Cruz Mountains.

High Tide Information:

Friday, April 6:  5:18 PM 5.71 ft 
Saturday, April 7: 3:49 AM 6.40 ft 
Saturday, April 7: 6:32 PM 5.77 ft 

Small rivers and streams could flood, especially if heavy rain rates persist across a watershed longer than anticipated. Flooding would be most likely in low lying and flood prone areas. 

Persons living near rivers and streams or other flood prone areas should be alert for the possibility of flooding during this Atmospheric River event late in the week. Flood watches may be issued once forecast confidence concerning rainfall amounts increases, especially if subsequent forecast models indicate higher rainfall totals or more intense rain rates.

Residents in areas with a history of flooding are advised to monitor creek and tide levels. Move vehicles to higher ground, especially in flood-prone areas. Move items stored in low-lying areas, such as basements or other areas that have flooded in the past.

Commuters who travel in areas with a history of flooding are advised to monitor high tides. Check prior to your trip to anticipate traffic conditions. Road closures are often posted by the Mill Valley Police Department on Twitter.

Please be advised to keep out of creeks and waterways during the storm. 



Click here for the latest information about local storm conditions from the National Weather Service.



Power Outages

Residents are advised of possible downed trees and power lines. Power outages are likely in the Bay Area. Power can go out at any time - are you prepared? If your power goes out, check the PG&E Outage Map for updates. 

If you see a downed power line call 911 immediately. For more safety information about downed power lines click here.



Traffic & Road Closures

Flooding or fallen trees may cause traffic back-ups and road closures. Road closures will be posted at as they are reported. Check for updates on traffic before your trip. 

Drive with Caution: When driving in the rain, use extra caution and always have your headlights on. Remember, if you turn on your windshield wipers, turn on your headlights. Please obey the speed limits and follow other traffic at a safe distance.



Stock up on Sandbags

We urge residents to initiate their winter preparedness measures early in the season by seeking sand and sandbags should they need them. Sand and bags can be purchased at local hardware stores. Watch a video on how to fill and place sandbags.

City Supplied Sandbags (unfilled)
Residents or business owners may also pick up unfilled sand bags at:

Mill Valley Main Fire Station 7
(Public Safety Building), 1 Hamilton Drive.
Limit of 10 sandbags per household or business.

Sand may be located at the following locations:*

  1. Hauke Park parking lot next to Public Safety Building, 1 Hamilton Drive
  2. Thalia parking lot at Boyle Parkoff of East Blithedale Avenue
  3. Parking area on Molino Ave., behind Old Mill Park (approximately 100' yards east of Molino Avenue/Cascade Way)

*These locations have limited stockpiles of sand for emergency use during the rainy season. To use these stockpiles,you must supply your own labor, shovels and support.

Please note that the safety of Mill Valley citizens is the first priority of City work crews, and that replenishing the sand pile and bags may become a lower priority during a storm event. If you have questions or comments please call Department of Public Works at 388-4033 or the Fire Department at 389-4130. 




High tides, combined with high run-off usually leads to flooding on lower Miller Avenue and Camino Alto, as well as the Redwood Hwy Frontage Road. 

Please click here for High Tide information.



How to stay informed during winter storms? 

We will post regular updates to the website.

Sign up for Emergency Alerts at  



Be prepared

The City of Mill Valley strongly encourages businesses and residents to prepare for the upcoming rain and potential flooding. 

Click here for Storm Preparation information.