Here's How Much Rain Fell In NorCal's First Major Fall Storm

SAN FRANCISCO, CA — An atmospheric river-fueled storm dropped about a month’s worth of rain in a single day, leading to flash flood warnings and evacuations throughout the Bay Area.

The rain began Monday night and continued into Tuesday night due to a low-pressure system from the Alaskan gulf. San Jose received 1.5 inches, the third-highest total for any October since 1897 when records first started, according to the National Weather Service.

The storm moved east, causing the heaviest rainfall in the East and North bays, and lighter amounts along the coast. Flood Advisories were issued Monday for eastern Alameda and Contra Costa counties.

On Tuesday, a severe thunderstorm developed over Salinas, with reports of a brief funnel cloud, hail and wind gusts up to 60 mph.

A Winter Storm Watch was also issued in the Sierra Nevada Mountains, which remained in effect until 11 a.m. Wednesday. Snow fell Tuesday at heights of 5,500 to 6,500 feet of elevation.

All told, disruptions were relatively minor. The California Highway Patrol closed the transition ramp from northbound I-880 to eastbound I-980 in Oakland Monday night for about two hours, and many local roads were closed due to flooding and toppled trees.

Blue skies are predicted for the foreseeable future in much of the region.

The preliminary rainfall totals from Oct. 13-15, according to the National Oceanic and Atmospheric Administration’s Regional Climate Centre varied dramatically: San Jose received 2.29 inches, and Half Moon Bay saw a meager 0.15 inches. Much of the East and North bays experienced between 1 and 1.5 inches, with Livermore seeing a standout 1.53 inches.

San Francisco & Peninsula

• Burlingame – 1.47"
• SFO – 0.87"
• Downtown SF – 0.75"
• Pacifica – 0.61"
• Half Moon Bay – 0.15"

East Bay

• Livermore - 1.53”
• Danville – 1.45"
• Lafayette – 1.41"
• Castro Valley – 1.35"
• Benicia – 1.30"
• Walnut Creek – 1.11"
• Martinez – 1.07"
• Concord – 1.05"
• Pittsburg – 1.08"
• Oakland – 0.90"
• Berkeley – 1.11"
• Albany – 0.98"

South Bay

• San Jose – 2.29"
• Sunnyvale – 1.33"
• Los Altos Hills – 1.41"
• Portola Valley – 1.30"
• Redwood City – 0.54"

North Bay

• Santa Rosa – 1.42"
• San Rafael – 1.12"
• Mill Valley – 0.81"
• Napa – 0.88"
• Cotati – 0.88"
• Petaluma – 0.74"
• St. Helena – 1.27"
• Vallejo – 1.43"

Inland & Beyond

• Vacaville – 1.77"
• Sacramento – 1.58"
• Livermore – 1.53"
• Monterey – 0.60"
• Santa Cruz – 1.02"

SEE ALSO:

• Here's How Much Rain Fell In Major LA Storm So Far
• Funnel Cloud And Hail Warning Issued As Norcal Braces For More Thunderstorms
• Rain Brings Emergencies By The Dozen For Napa, Sonoma County Fire, Police
• Flood Advisory For Contra Costa And Alameda Counties Issued
• Flash Flooding Across Marin, Napa County, Sonoma
• NWS: Life-Threatening Flash Flood Warning Extended In Napa County