TIMELINE: Atmospheric river to bring heavy rain, possible flooding to Bay Area this weekend

SAN FRANCISCO (KGO) -- Rain is back in the Bay Area on Friday after three and a half weeks of dry weather, which has been one of the driest January's on record. Rain is light on Friday but intensifies on Saturday with a moderate-strength atmospheric river and we may see flooding on roads and on smaller streams and creeks.

LIVE: Track storm with Live Doppler 7

A Flood Watch is in effect for the entire Bay Area through Sunday.

FRIDAY (Level 1)

• Light, steady rain spreads across the Bay Area from north to south this morning


• Steady light rain occurs between 8 a.m. and 2 p.m.


• After 2 p.m. and into the evening the rain becomes more on and off and scattered


• Biggest impact would be slower and slick travel


• Winds will be breezy but not too strong or damaging


• Rainfall totals will be less than .75" for most

MORE: How January's dry weather could spell trouble for California's water supply

SATURDAY (Level 2)

• Between 6 a.m. and 1 p.m. we will see pockets of heavy rain


• This is when we have the highest threat for localized flooding especially on roads with poor drainage


• Winds will also be gusty, 20-40mph which could bring down trees


• After 3 p.m. the showers will become lighter and scattered


• Rainfall totals could exceed an inch in many cities

SUNDAY (Level 1)

• On and off light scattered showers

SIERRA SNOW

• 2 - 3 feet of snow Friday night into Saturday night on highest peaks


• Lake level could see close to a foot of fresh snow