Storms are expected to blanket Marin with rain that could affect commuter traffic throughout the week.
The first system is forecast to bring no more than a quarter-inch of rain to the lower elevations of Marin on Monday night through Tuesday, said National Weather Service meteorologist Matt Mehle. Mount Tamalpais might get up to a half-inch of rain.
It is considered to be a weaker system than a storm lingering over British Columbia and is expected to bring rain to Marin on Wednesday night through Friday. The second system includes a cold front off the California coast, which is expected to bring as much as 0.75 inches of rain at lower elevations and more than an inch of rain at higher elevations.
“This second system is going to be stronger and has a better amount of moisture associated with it,” Mehle said.
The stronger system also includes the slight chance of thunderstorms and small hail on Thursday.
The system is unlikely to cause flooding.
The storms follow two systems that brought rain to Marin last week.
A storm that passed through on Friday and Saturday brought 1.25 inches of rain to Mount Tamalpais and 1.14 inches in the Point Reyes National Seashore, according to the National Weather Service. Kentfield had just under an inch of rain, Mill Valley had 0.66 inches and Novato had 0.28 inches.
The Marin Municipal Water District has recorded 47.67 inches of rain from July through Sunday. The total is 97.62% of the average rainfall of 48.83 inches to date. The district’s reservoirs are at 72,282 acre-feet, or 90.85% of capacity.