the waldo gradei it's wet out there. standing water overnight. use extra caution. take a look at the south bay commute in a few minutes. >> thank you, sue. developing news in san francisco, the man police say brutally beat an 88-year-old grandmother is off the streets this morning. >> officers arrested 18-year-old them saturday after he committed another robbery. details of that crime are unclear. police believe they beat her in a park before breaking into her nearby home. police haven't revealed how they linked him to the attack. wong's family is slowly improving. >> the san francisco police officers association offered a $10,000 reward leading to an arrest in the case. it's unclear if it will be given out because police released few details about the arrest. a go fund me page for wong and her family raised just over $10,000 of the $25,000 goal. we have a link to on our website. abc7news.com. >>> a one-day walkout on friday, the union set a date for teachers to take a strike authorization vote. the vote will be taken over four days beginning january 29th. the teac