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Subtropical Moisture Surges Across the West

10 Sep 2021, 4:05 pm

Sub-tropical moisture from the Eastern Pacific is being pulled across the Western United States, creating heavy showers and thunderstorms. Over an inch of rain fell in portions of California Thursday afternoon into Friday morning, with chances for heavy showers, severe thunderstorms, and dry lightning shifting north through Saturday in the Northwest and Northern Rockies.


Severe storms are possible on Friday afternoon and evening across the Great Basin to the north into Oregon, Idaho, and Wyoming. Gusty winds and large hail are possible in the strongest storms.

There is also an increased risk for dry thunderstorms, which could spark new wildfires. The areas in brown have the highest risk for evaporating rain in thunderstorms.



As a trough of low pressure moves onshore in the Pacific Northwest Friday afternoon, it will provide enough wind shear for a few organized thunderstorms that could produce the severe weather threats of large hail and damaging winds.


Rain is generally expected to be between a quarter of an inch and three quarters of an inch, though some locations could see upwards of 1-2 inches. In these locations, flooding will be possible, especially in over burn scars where fires have burned in the last few years.

For the latest forecast in the Western Region, tune in at 50 past each hour.

About the author

Rob grew up in South Florida, where daily afternoon storms and hurricanes piqued his interest in meteorology early on. That interest was fostered by his teachers and his father, who one time brought him onto the roof of their home to watch a funnel cloud move through the Everglades several miles away. ... Load MoreYears of filmmaking and tv production in high school gradually pushed him toward broadcast meteorology at Florida State University, where he joined and eventually led the student run daily weather show. After graduating with a Bachelors of Science in Meteorology, he began his career at KESQ in Palm Springs, California before heading to KFSN in Fresno and WLOS in Asheville, North Carolina. He has covered a diverse array of extreme weather events, including haboobs and flash flooding in the desert, extreme snow in the Sierra, hurricanes, and Appalachian ice storms. He also enjoys telling stories and reporting about weather issues. Connect with Rob on Twitter