The National Weather Service has cancelled a flash flood warning Tuesday for north-central Ada County, including Boise, Garden City and the Foothills. The alert, set to end at 11:15 a.m., was cancelled shortly before 11 a.m.; it did not appear that any significant flooding occurred in the region.
The biggest concern was the Foothills, according to NWS. A fast-moving thunderstorm could overwhelm small creeks, streams and gulches, and meteorologists warn residents to be prepared to leave those areas immediately if water levels rise quickly.
The warning, issued at 9:40 a.m., also advised that "excessive runoff from heavy rainfall will cause flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other drainage areas and low-lying spots." Bogus Basin and Hidden Springs also were identified as areas potentially impacted by the heavy rain.
Also Tuesday morning, a power outage affected 628 customers in Boise, according to Idaho Power. The area affected extended from Interstate 84 to the Boise Towne Square Mall, and from Curtis Road to Maple Grove Road.
Power to the mall was restored at about 10:40 a.m., according to the Boise Towne Square Mall's Twitter.
The outage and the weather are not necessarily linked, Idaho Power spokesman Brad Bowlin said. Although the sudden downpour is on the forefront of most peoples minds, the lack of power could have a more mundane cause, like a squirrel getting into the power line, he said.
It could just be coincidental to the weather, although sometimes a sudden outburst like that will cause some problems."
Ada County dispatchers said there have been no crashes in the area and no reports of lines down.