Redwood City – A winter storm packing heavy rain and strong winds is expected to hit San Mateo County, prompting local emergency managers to provide tips on how to keep you and your family safe.
Thunderstorms and wind gusts of up to 55 mph are possible throughout the day with periods of intense rainfall expected this evening, according to the National Weather Service.

“Expect rain rates up to 0.50 (of an inch) per hour with the main front,” the weather service posted in its morning forecast.
Up to 4 inches of rain could drench coastal areas by the end of the week.
County emergency managers are offering preparedness tips and are urging residents to take precautions.
Sign up for emergency alerts
All residents are encouraged to sign up for SMC Alert. This is the County’s primary alert and warning system used to contact you during urgent or emergency situations which may include life safety, fire, weather, accidents involving utilities or roadways or disaster notifications.
Numerous cities offer localized emergency alerts. You can usually find this by searching for “sign up for emergency alerts (city name).”
Prepare your residence
- Secure outdoor furniture
- Keep emergency supplies handy
- Check on neighbors
Heavy rains can cause flooding and erosion and sweep away topsoil, mud, plant material and debris off.
To help prevent damage, County residents in unincorporated areas may pick up pre-made sandbags (limit 15) free of charge at certain locations as available. In addition to pre-made sandbags, the County provides materials (loose sand and sandbags) on a 24/7 basis for individuals to fill as many bags as they need on their own.
The County also provides a list of sandbag locations for residents within cities. Be sure to verify the information before heading out. Also check out your own city’s website for further information.
Be prepared to assemble and load the sandbags yourself. Most city sandbag stations require assembly of the sandbags.

Be careful on the roads
- Reduce speed - give yourself 5-10mph buffer below limits
- Turn on headlights - improves visibility
- Double your following distance (at least 4-5 seconds)
- Avoid puddles that hide potholes
- Never drive through flooded roads
- A mere 6 inches of fast-moving flood water can knock over an adult. It takes just 12 inches of rushing water to carry away most cars and just 2 feet of rushing water can carry away SUVs and trucks.
- Postpone unnecessary travel during the heaviest rainfall
- If hydroplaning: ease off gas, don't brake suddenly, steer straight