High pressure over Arizona will support above-normal temperatures and a weak south-southwest flow over the next few days. Remnant moisture from Iselle in the Eastern Pacific will also be drawn northward over the region, making for a very tropical environment with enough mid-level instability for a few showers and thunderstorms at times, mainly during the afternoons. Continued warm with highs in the mid-80s through Friday, while overnights cool to the 50s and 60s. High pressure will shift further east this weekend as a trough of low pressure develops off the West Coast. This will lead to cooler temperatures next week as highs return to seasonal levels while the onshore flow increases. The southwesterly flow aloft may also draw additional tropical moisture into the region for a chance of showers and thunderstorms across all areas towards the middle of next week. But the extent of moisture and instability for SoCal is unknown at this time. This will be an increasing risk over the next month or so, with an active hurricane season in the Pacific and troughing that develops along the West Coast this time of year.

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