Those storms are here, Boise, and there’s ‘monsoon moisture’ in the air
The National Weather Service issued a flash flood watch as a cluster of thunderstorms landed in the Treasure Valley on Tuesday, bringing high winds and torrential rain.
The weather pattern means they aren’t likely to move quickly, the weather service said, and it advised people to “take shelter from storms, and do not drive through flooded roadways.”
On its website the weather service said that “monsoon mositure” in the atmosphere would bring moderate to heavy rainfall and stronger storms, overnight into Wednesday and even Thursday.
NWS Boise meteorologist Jackson Macfarlane said there was a “nearly record-breaking amount of moisture in the atmosphere” to accompany these slow-moving storms.
“These terrain-induced storms kind of hug the mountains and hills they are formed off of, and tend to drop all that rain in the exact same spot for a prolonged period of time,” Macfarlane told the Idaho Statesman.
The thunderstorms Tuesday evening were hovering over Boise and the mountains, with winds from 25-40 mph accompanying some cells, and heavy rain associated with some of them as well.
The weather service said on social media that 1.7 inches of rain fell at the Lucky Peak marina in a span of 45 minutes, and heavy rain was falling on the scar from last year’s Valley Fire in Boise’s East End, making mudslides a possibility.
“We’ve had multiple flood advisories and flash flood warnings today that have been caused by those storms that are dumping near-record amounts of moisture over the same spot,” Macfarlane said.
This story was originally published August 26, 2025 at 6:58 PM.
