Break out the umbrellas and the galoshes, as a record amount of rain is expected to fall over Northern California in the next two days.
"We're looking at almost doubling the monthly average in just four days," said Brooke Bingaman, meteorologist with the National Weather Service in Sacramento.
Sacramento may get 0.4 to 0.5 inches of rain by the time the storm moves out on Wednesday. Typically, this area gets no rain at all from June 23-26, and the average rainfall for June is only 0.19 inches. The record for the most moisture on those four dates is 0.44 inches, set in 1912.
But it's not only the Sacramento Valley that will get wet.
Redding, which averages 0.07 inches from June 23-26, should get a half-inch to an inch of precipitation from this system. That amount would top the average 0.69 inches for the month. The record amount of rainfall posted for the city on June 23-26 was 0.71 inches in 1992.
Stockton, which is also normally dry during this time of the year, is expected to receive 0.22 inches of moisture, well above the average of 0.08 inches for June. The city's record rainfall for June 23-26 was set in 1996, with 0.09 inches.
"This is an anomalous system to come in June with this much moisture," Bingaman said of the current weather maker.
Blame it on a huge low-pressure system parked off the coast of Canada and the Pacific Northwest that began moving south Sunday, and a huge plume of moisture stretching from the Pacific coast to west of the Hawaiian Islands.
"This storm is a little more north of us, but as it moves southward, it's going to tap into that moisture plume and dump a notable amount of moisture for us," said Bingaman, adding that the moisture plume carries about 1 to 2 inches of precipitation.
Red Bluff started to get some light drizzle Sunday morning, while Sacramento was not expected to get wet until after 9 p.m. Sunday.
Showers are expected on and off through Wednesday, with the heavier rainfall on Monday and Tuesday. The Delta breeze will accompany the storm, bringing in south/southwest winds ranging from 10 to 20 mph, with gusts up to 30 mph.
Although no thunderstorms or lightning are expected to accompany this front, temperatures will be dropping as it passes through the state, possibly setting records for coolest daytime highs for June 24.
Sacramento's high today is expected to be only 70 degrees, 20 degrees cooler than the average for the date. The record low high temperature for June 24 in the city is 72 degrees, set in 1991. Tuesday's mercury reading is expected to reach only 77 degrees. Despite the rain, lows will remain unchanged for this time of year upper 50s to low 60s.
"One of the reasons is when you have so much cloud cover, it traps the heat during the day, so it would stay warmer at night," said Bingaman.
The highs are affected because "the clouds would prevent the sun from heating during the day," she said.
Warm weather, however, should resume Wednesday, with sunny skies and highs in the upper 80s for Sacramento.
The mountains may still see lingering showers through Wednesday night, when the storm finally leaves the state.
The heat is on for the rest of the workweek, as the mercury starts creeping up to the low to mid-90s Thursday and mid-90s Friday.
"Monday is going to be our coolest day," said Bingaman. "It is going to be a drastic change this week."
Call The Bee's Tillie Fong, (916) 321-1006.