CAJON PASS, CA. (Pain In The Pass) >> More moisture bands from Tropical Storm Rachel and an Alaskan Cold Cutoff Low is moving toward Southern California on Monday morning.
What is a cutoff low? It’s an upper-level, low-pressure system that detaches from the main jet stream. Because it’s no longer steered by the fast-moving jet stream winds, it tends to become nearly stationary, remaining in the same area for several days or moves very slowly across the area.*
This with bring a chance of more rain showers, snow showers, and thunderstorms for Monday morning into the evening.
No chance of snow showers in the Cajon Pass with this storm.
Timing for Inland Empire/Cajon Pass. Light rain showers could start around 11pm Sunday night – 3am Monday morning. Light to moderate rain showers could start around 4am Monday morning and will last until the evening. Foggy conditions with light to moderate rain showers in the Cajon Pass. The Cajon Pass/foothills could get about a ¼ inch to ¾+ of rain total. The Inland Empire cities could get a ¼ inch to ½+ inch of rain total; each city could vary and if you are near the foothills will get more rainfall.
Timing of the storm for the High Desert. Rain showers could start around 12am – 4am Monday morning. 5am off and on light to moderate rain showers for the high desert into the evening. Chance of isolated thunderstorms could bring higher rain totals. Deserts could get about a trace to ½ of rain total. Gusty winds are in the forecast.
Timing of the storm for the Big Bear Wrightwood area Mountains. Rain showers could start around 12am – 3am Monday morning. Around 5am off and on light to moderate rain showers until the evening. The mountains could get about a ¼ inch to ¾+ of rain total. Snow level will drop Monday late afternoon/night to around 6,000 feet with a dusting to two inches total. Chance of isolated thunderstorms could bring higher rain totals. Gusty winds are in the forecast.
If you travel through the Cajon Pass or on Interstate 15 expect traffic due to the weather condition can change quickly. Remember to SLOW DOWN in the rain or in foggy conditions with your headlights on.
One minute no fog then the next minute heavy fog on the freeway.
Please leave early for the commute up or down the pass.
* Cutoff lows do spin around counter clockwise and rain showers can come back in the area.
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