The risk of localized flash flooding continues through the end of the week over part of the interior West.
Cities at risk for flash flooding during the random storms include Las Vegas, Phoenix, Tucson, Flagstaff, Albuquerque, Salt Lake City, Cedar City in Utah and Riverside, Calif.
According to Western Weather Expert Ken Clark, "An upper-level disturbance drifting in from the Pacific will focus an already in place flow of tropical moisture, known locally as the monsoon."
The end result will be more numerous and locally, extra-drenching showers and thunderstorms from interior California to New Mexico, northward to Utah and Colorado.
The storms will tend to favor, but not be limited to the high ground.
Isolated downpours can quickly flow downhill, causing canyons and arroyos to quickly fill with water.
The spotty downpours can also lead to debris flows in recent burn areas.
While area residents will welcome any non-destructive rainfall, a number of the storms will bring little or no rainfall, frequent lightning strikes and the risk for new wildfires.
"By the end of the week the storms will consolidate farther to the east and south over the Four Corners states as drier air invades from the north and west and the disturbance pushes inland," Clark added.
At such time the risk for flash flooding in Las Vegas and Phoenix will have ended.
Meanwhile, a stalled front will continue to bring rounds of drenching thunderstorms and the risk of flash and urban flooding to parts of the southeastern U.S. this week.
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A melting alpine glacier on Mount Shasta in northern California created a messy situation as the flowing ice water turned into a disruptive mudslide with more harmful rainfall on the way.
Umbrellas and raincoats will be put to good use by those along much of the Interstate-95 corridor as rain moves northward during the middle of the week.
Heavy rain this week has led to deadly flooding and mudslides across northeast India and Bangladesh.
Temperatures will rebound across the Northeast this coming weekend, after a setback with clouds and rain along the coast before Friday.
A pattern change will usher in cooler air and rain to the Northwest this week.
Snow in the Appalachians.
Stowe, VT (1885)
12" of snow.
Washington, D.C. (1980)
Temperature hit 90 degrees for the 67th time in 1980. Never had there been a year in recorded history with so many 90-degree readings. The previous record was 59 days in 1966.