CAJON PASS, CA. (Pain In The Pass) >> An erratic cutoff low to move through Southern California Saturday and Sunday.
Since it is a cutoff low, here’s a more detailed explanation what is a cutoff low is a low-pressure system that becomes detached or isolated from the main flow of the jet stream. This “cutting off” leads the low-pressure system to stall or move very slowly, often for several days, over a particular area.
The center of the low will be in the state of Arizona, where Southern California Weather Force have issued a Flood Watch over that state. see map below.
As the cutoff low spins around on Saturday it will bring a chance of isolated thunderstorms and rain showers for the deserts and in the mountains.
Sunday will be the peak of the rainfall and for a chance of thunderstorms as outflow boundaries move out of Baja, Mexico and into Southern California, igniting the San Diego, Riverside, and San Bernardino Mountain locations within the most rainfall, including the southern half of Imperial County.
An isolated thunderstorm or two can spill over into the Inland Empire. Remember it’s a cutoff low.
The peak time of an afternoon pop-up thunderstorm can start before just before 12pm to 5pm and can last until 8pm with the heat.
Each thunderstorm cell will also capable of producing gusty, erratic outflow winds, gusting upwards of 40 to 60+ mph in the region.
The heaviest downpours can have the potential to bring a quick 1+ inch of rain. The risk for localized flash flooding is low for Southern California, but cannot be ruled out because the ground is dry and in the burn scars areas.
“When Thunder Roars, Go Indoors”
If you travel through the Cajon Pass or on Interstate 15 from Barstow to Stateline/Las Vegas area. Also onI-40 from Lake Havasu/Laughlin/Needles to Barstow can expect traffic due to the weather condition that can change quickly. Remember to SLOW DOWN in the rain or in blowing dust.
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