HURRICANE ROSA MARCHES NORTHEAST, AND PACIFIC STORM FORMS OFF CALIFORNIA...

Sunday afternoon is proving to be cloudy and cooler, as forecasts were calling for. Scattered storms have begun popping up in a few areas, and a large shield of rain is lurking south of the Mexican border.

Temps have mostly stayed UNDER 100 degrees today, and in some areas, temperatures are already dropping down under 90 degrees.

The leading edge of the cloud shield associated with weakening Hurricane Rosa has now spread over most of Southern California. Cumulus clouds have been popping up in the increasingly unstable and humid airmass as well, and winds have backed to the southeast and east.

SUNDAY AFTERNOON UPDATES

As of 430pm, strong thunderstorms had formed along the Colorado River Valley from near Yuma up to the Blythe area. Some areas near Blythe have received well over 0.50 inch of rain thus far, and several downdrafts associated with these storms have created dust storms that are currently moving west through the Imperial Valley, as well as west along I-10 near Desert Center.

As of 430p, a few thunderstorms formed from near La Quinta and were moving northeast into the Indio area. Also, a larger area of thunderstorms has been forming and re-forming in an area east of the Salton Sea, towards Blythe. Outflows associated with the thunderstorms have created a dust storm, as indicated by the red dotted line above, moving west.

As of 430p, a few thunderstorms formed from near La Quinta and were moving northeast into the Indio area. Also, a larger area of thunderstorms has been forming and re-forming in an area east of the Salton Sea, towards Blythe. Outflows associated with the thunderstorms have created a dust storm, as indicated by the red dotted line above, moving west.

POSSIBLE DUST TONIGHT?

If the outflows continue marching west, it is possible the skies will become hazy or dusty in the Coachella Valley, sometime in the 530 - 630pm time frame. East winds may increase to the 20-30 mph range for a brief period, if this outflow holds together. Currently, visibility has dropped to less than 0.50 mile in portions of the Imperial Valley near Imperial. Yuma and Blythe had reduced visibility earlier today as well. The next areas to possibly receive dust could be the Salton Sea, as well as the Thermal and Coachella area. More likely than not, this outflow will likely weaken before reaching Palm Springs.

RAINFALL CHANCES TO INCREASE

As previously mentioned, as of 430pm, there is a stationary area of thunderstorms in a line from just south of La Quinta, and to the northeast into Indio. The area of storms continues to reform in the same location, and may begin street flooding soon, if the storms don’t begin moving along. They are forming along the leading edge of the cloud shield of the distant hurricane.

After sunset, most of the thunderstorms are expected to begin diminishing, leaving a chance of light to moderate showers at times tonight. Rainfall is likely to be under 0.10 inch.

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Monday and Monday night is expected to experience more steady rainfall, likely 0.25 - 0.75 inches throughout most of the Coachella Valley. It is possible there may be localized greater amounts, but flooding rains are now expected to be focused more to our east, in Western Arizona. Still, this could bring us a nice soaking.

Several additional storms will move in off the Pacific on Tuesday - Thursday. These storms will mostly focus rain and thunderstorms from the mountains to the coast, with the deserts not likely to receive large precipitation amounts. However, a few showers could make it over the crests and across our deserts.

Enjoy the upcoming cooler weather, as temps will likely drop into the 80s much of the week… with low down into the 60s soon!