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What is the Fujiwhara Effect and how did it impact Tuesday's storm

It's called the "Fujiwhara Effect" and is the interaction between two similarly sized low-pressure centers rotating around a common center.

Mar 22, 2023 (02:25)

Cooler temps to hold in the Bay Area until mid-week warm-up

Cooler temps to hold in the Bay Area until mid-week warm-up

Oakland woman publishes book about family conflict, mental health

Oakland woman publishes book about family conflict, mental health

Fleet Fest puts on free events at San Francisco Fisherman’s Wharf

Fleet Fest puts on free events at San Francisco Fisherman’s Wharf

Blue Angels put on weekend show for Fleet Week in San Francisco

Blue Angels put on weekend show for Fleet Week in San Francisco

First Alert Weather Saturday morning forecast 10-10-26

First Alert Weather Saturday morning forecast 10-10-26

San Francisco's Rikki's sports bar packed with fans watching Valkyries punch WBNA Finals ticket

San Francisco's Rikki's sports bar packed with fans watching Valkyries punch WBNA Finals ticket

Japanese retailer Uniqlo celebrates return to Downtown San Francisco

Japanese retailer Uniqlo celebrates return to Downtown San Francisco

Valkyries fans pack Rikki's sports bar in San Francisco for semi-finals Game 3 watch party

Valkyries fans pack Rikki's sports bar in San Francisco for semi-finals Game 3 watch party

Bay Area's VetsBoats gives military members space for healing

Bay Area's VetsBoats gives military members space for healing

Friday evening First Alert weather forecast - 10/9/26

Friday evening First Alert weather forecast - 10/9/26

How businesses are trying to capitalize on San Francisco Fleet Week crowds

How businesses are trying to capitalize on San Francisco Fleet Week crowds

East Bay teens looking to join U.S. Marine Corps share why

East Bay teens looking to join U.S. Marine Corps share why

Ships sail underneath Golden Gate Bridge for 2026 Fleet Week parade

Ships sail underneath Golden Gate Bridge for 2026 Fleet Week parade

Friday morning First Alert weather forecast with Jessica Burch - 10/9/26

Friday morning First Alert weather forecast with Jessica Burch - 10/9/26

Fleet Week kicks off with Heroes Block Party in San Francisco

Fleet Week kicks off with Heroes Block Party in San Francisco

Veteran KPIX reporter Len Ramirez signs off for last time before retirement

Veteran KPIX reporter Len Ramirez signs off for last time before retirement

Santa Cruz County town fights to get its mail deliveries restored

Santa Cruz County town fights to get its mail deliveries restored

San Francisco Fleet Week ship tours always a big draw

San Francisco Fleet Week ship tours always a big draw

Elderly couple visiting from Spain severely injured in Berkeley hit-and-run crash

Elderly couple visiting from Spain severely injured in Berkeley hit-and-run crash

SF, North Bay Glens soccer club exec gets ride aboard U.S. Navy Blue Angels jet

SF, North Bay Glens soccer club exec gets ride aboard U.S. Navy Blue Angels jet

Thursday evening First Alert Weather forecast 10/8/26

Thursday evening First Alert Weather forecast 10/8/26

Peninsula farmworker support group ALAS opens new Salinas clinic, unveils mobile resource center

Peninsula farmworker support group ALAS opens new Salinas clinic, unveils mobile resource center

Survivors of 2017 Tubbs Fire still seeking full compensation

Survivors of 2017 Tubbs Fire still seeking full compensation

San Francisco hearing examines Police Department failure to solve sexual assault cases

San Francisco hearing examines Police Department failure to solve sexual assault cases

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