Hurricane Rosa a major FLOOD threat to California Arizona New Mexico

This needs to be watched carefully.
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https://weather.com/storms/hurricane/news/2018-09-26-hurricane-rosa-southwest-moisture-early-october

Hurricane Rosa, a Category 4 Storm Well Off Baja California, Will Be Desert Southwest Flood Threat Next Week

Hurricane Rosa is an intense eastern Pacific hurricane.
Rosa's remnant will track into the Desert Southwest early next week.
Widespread rain, flash flooding and cooler temperatures will result across the Southwest.
Hurricane Rosa is a formidable hurricane in the eastern Pacific, but its greatest impact will likely be as a remnant bringing a threat of flash flooding to the southwestern United States early next week.

Rosa became a hurricane Wednesday morning in the eastern Pacific Ocean just under 500 miles south-southwest of Cabo San Lucas, Mexico.

Rosa will soon run out of warm water - fuel for hurricanes - and will begin to weaken by Saturday.

Drier air and increasing vertical wind shear will also work to weaken Rosa.

Rosa is now turning more toward the north in response to an upper-level trough, or southward dip in the jet stream, that will be approaching the southwestern United States.

It is expected to weaken to a tropical storm, possibly a depression, before reaching the northern Baja California Peninsula Monday.

Late this week and into this weekend, swells from Rosa will likely cause life-threatening surf and rip-current conditions for portions of the southwestern Mexican coast, the southern Baja California Peninsula and Southern California.

Impacts Likely in the Southwestern U.S.
Rosa remnant spin and moisture will be pulled into the Desert Southwest because of a strengthening southward plunge of the jet stream off the California coast next week.

This will produce widespread rainfall, triggering flash flooding in parts of Arizona, southeast California, southern Nevada, Utah, and perhaps northwest New Mexico and parts of western Colorado next week.

Flooding normally dry washes, small streams in the high country, slot canyons and debris flows over recent wildfire burn scars are all possible.

Rain chances may increase by Monday, with the heaviest rain possible Tuesday, possibly lingering into Wednesday.

In addition, the upper-level trough and cloud cover will bring cooler temperatures, with highs near to slightly below average for early October. For example, Phoenix will see highs in the mid-80s by Tuesday instead of the lower 100s expected through Saturday.

Interestingly, remnant upper-level energy from Rosa may eventually be whisked into the Upper Midwest around the middle of next week, giving a boost to rain and t-storms in that part of the country, over 1,500 miles from where Rosa may landfall in northern Baja California.