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2021 Multijurisdictional Local Hazard Mitigation Plan December 31, 2005 Widespread flooding occurred throughout San Mateo County as a result of small stream overflow and poor drainage. Most damage occurred in East Palo Alto, the City of San Mateo, Daly City, Colma, Brisbane, San Bruno, South San Francisco, and Pacifica. Approximately 3 inches of rain fell on the area over a 24-hour period. January 20, 2010 A significant storm brought strong winds and heavy rain to the San Francisco and Monterey Bay areas. This storm developed over the Pacific Ocean with a strong parent low pressure based in the Gulf of Alaska. Areas of flooding occurred, causing problems mainly for vehicles. Heavy rain induced Pulgas Creek to overflow its banks and flood some classrooms at Central Middle School in San Carlos. Also, several streets were blocked off in low-lying areas just west of US Highway 101, including Taylor Avenue in San Carlos and parts of Rolison Road in Redwood City. In Atherton, officials closed March Road from Middlefield Road to Fair Oaks Avenue because a creek had begun to flood. Heavy rain caused Harbor Boulevard at the underpass of State Route 82 to flood, submerging a car to the base of its windows. The road was barricaded to stop anyone else from driving into the water. Belmont Creek flooding led to evacuation of a car repair business as 3 inches of water covered the floor. February 6, 2015 A strong winter storm impacted California following nearly a month and a half of no rain and the driest January on record. The storm brought heavy rain, gusty winds, and damage to trees and power lines, along with some minor flooding of urban areas. Rainfall amounts were heaviest in the mountains, with 5-10 inches or more occurring. Heavy rain resulted in flooding of Southbound US 101 off-ramp in Atherton. December 2015/January 2016 To mitigate impacts of flooding, the San Mateo County Department of Public Works and cities in the county set up two dozen sites where community members could pick up free sandbags (Patch.com, 2016). El Niño rains in January 2016 brought more rain into the Bay Area in two days than during the previous three Januarys combined (Mercury News, 2016). In general, San Mateo County avoided severe damage and flooding from the rains. La Honda recorded the largest amount of rainfall in the County, at 1.5 inches. Other than debris, some power outages, and transportation accidents, San Mateo County did not report any major issues. Response personnel for the cities monitored debris build-up, helping to reduce potential events. March 1, 2018 An upper-level system with a strong cold front moved through the Bay Area. This system brought widespread rainfall causing localized roadway flooding, strong winds, lightning, and small hail. Gusts in the mountains reached 60 mph and hail was seen up to a half-inch in diameter. The bulk of the precipitation and subsequent impacts were seen in early March (National Centers for Environmental Information, 2021). April 7, 2018 A late season atmospheric river impacted the area in early April. A very moist air mass made landfall across the North Bay before moving southward across the rest of the Bay Area. Enough rain fell to cause minor/nuisance flooding across much of the region. Numerous flood advisories were issued. Storm total rainfall amounts up to 7 inches were reported (National Centers for Environmental Information, 2021). 11-12