Grab your sweater, rain boots and umbrella – this big storm brings rain and cooler temperatures to the area all Monday.
The atmospheric, river-powered storm has already drained historic amounts of water over San Francisco and Sacramento, broken rainfall records and caused flooding in northern and central California.
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The same storm is expected to drop approximately 0.25 to 0.75 inches of rain over the coasts and valleys of SoCal and between 1 and 1.5 inches over the coastal slopes, foothills, and mountains during the day.
“It’s a humid and cool day that is expected to get stronger around noon,” said NBCLA forecaster Belen De Leon.
The rain will likely result in messy roads across SoCal, high surf near the coast, and even flash floods in the Alisal Fire scorched area.
Here’s when to expect the heaviest rain.
- Ventura County: Late morning
- Valleys and LA Basins: noon
- Orange County and Inland Empire: Early afternoon
SoCal will experience its first solid soak of the season on Monday, October 25th, 2021.
Around noon it will rain heavier in the counties of Los Angeles and Ventura. The clouds then move east in the afternoon, dropping water onto the Inland Empire and Orange Counties during the evening commute.
In the evening, shortly after sunset, the rain should go away.
The first real rain of the season should come from the SoCal region by Monday evening.
Remember to slow down during the morning commute: as it is the first rain of the season, the water mixes with the oil on the roads, creating smooth, slippery surfaces when light rain hits the western part of the region.
The heaviest rainy periods can also cause local road flooding. Stormy winds can cause some difficulties when driving, especially in the mountains.
For the mountains and deserts, there is a wind warning from Monday 6 a.m. to Tuesday 2 a.m. with gusts of up to 55 miles per hour in some areas. Attach loose items like Halloween decorations to keep them from flying away in the wind.
Meteorologist David Biggar knows the time of the storm and explains when to leave the road on Monday morning.
While most of the burn scars severe enough to cause mudslides or debris flows will be outside of SoCal, the Alisal Fire burn area in Santa Barbara County will experience some of the heaviest rainfall on the system.
Rain began early in the morning in the county, with the main front over Santa Barbara at 8:45 a.m.
With a flash flood warning in effect from 6 a.m. to noon on Monday, district officials issued evacuation orders for some residents late Sunday morning.
Monday’s storm could bring flash floods to the Santa Barbara district, which is particularly worrying for those near the Alisal Fire scar.
There are high surf warnings on the coasts with waves ranging from 6 to 12 feet.
Temperatures will remain cool as the rain system moves through the region, with highs only reaching the 1960s. However, due to the tropical nature of the storm, snow is expected to remain above approximately 8,000 feet.
Check for the latest weather updates during the day.