A weak southerly flow will draw mid and upper-level monsoon moisture into the region through the middle of the week for a chance of afternoon showers & thunderstorms, with the greatest risk across eastern mountains and deserts. We did see a few thunderstorms pop up today over the San Bernardino, Riverside & San Diego County mountains, with a decent cell firing off near Onyx Summit. Expect partly cloudy skies this evening with light winds and lows in the 50s to lower 60s. Partly cloudy and a little warmer on Tuesday, with a few afternoon thundershowers possible. These will be relatively high-based storms capable of producing brief heavy downpours, dangerous lightning, and small hail. Highs will top out in the mid-80s with east winds 5-10 mph, gusty near any storms. Little change on Wednesday with highs in the mid-80s once again and an isolated afternoon thunderstorm possible. As high pressure shifts a little further west, we'll likely cut off the monsoon flow by Thursday through the weekend but keep temperatures 5-10 degrees above average. This ridge will weaken and shift further east again over the weekend into next week, which should allow for some cooling and put us in a more favorable flow for monsoon moisture to return, possibly enhanced by a couple of tropical systems in the East Pac!

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