Tropical Storm Rosa will bring the potential for thunderstorms, heavy rain, hail and flash flooding in the Southwest beginning Monday. Conditions will begin easing within less than 48 hours, according to the National Weather Service. 

This flash flood watch begins at 2 p.m. Monday and ends at 5 a.m. Wednesday. Abundant tropical moisture will start streaming into southeast California, southern Nevada, and northwest Arizona later Monday. This could lead to the potential for numerous rain showers and isolated thunderstorms capable of causing extensive flash flooding. 

Some locations could experience rainfall of 1-3 inches per hour, the NWS reported.

Overall chance of precipitation Monday night and Tuesday is at 80 percent, and that will decrease to 50 percent on Tuesday evening. By Wednesday, the chance for precipitation will reduce to just 30 percent. 

Thunderstorms Monday evening and Tuesday should begin decreasing on Tuesday night as well.

A flash flood watch means that conditions may become favorable for flooding of washes and other drainages in the watch area. Monitor weather forecasts and be prepared to take immediate action should heavy rain and flooding occur or a flash flood warning is issued, the NWS also advises.

High temperatures are expected to only reach the mid-to upper-80s starting today.  

Storminess began in the Tri-state on Sunday afternoon. The day was predicted to bring scattered showers, thunderstorms and wind with gusts of up to 25 mph.

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