For the first time in recorded history, downtown San Francisco was issued a tornado warning on Saturday as severe storm conditions swept through the city, prompting local authorities to warn residents of the rare threat.

Many Bay Area residents raced away from the ocean after a jolting cellphone alert warned, “You are in danger.” Others raced toward it.

If your phone screeched with a tsunami warning alert on Thursday morning and it left you wondering what you're supposed to do, you're not alone.