A spokesman for the US National Weather Service (NOAA) said: “The Storm Prediction Centre has issued a Slight Risk of severe thunderstorms over the Pacific Northwest through Thursday morning.
“A fourth front over the Eastern Pacific moves onshore over the West Coast, continuing eastward to the Northern Rockies to Southern California by Thursday evening.
“The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes, and there is an added threat of hail, two inches or greater over the region.”
In days, the US will mark the most dangerous time of year for violent thunderstorms and tornadoes.
Deep southern states are most at risk of twisters which start their three-month rampage around the start of April.
Most tornadoes strike in May, with around 260 in the month building to a seasonal average of more than 500.
Weather Company meteorologist Chris Dolce said: “April, May and June are the most active months, especially when it comes to very large, destructive tornadoes.
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