NAMPA, Idaho — A severe thunderstorm warning was in effect for Boise, Nampa, and surrounding areas of southwest Idaho on Thursday evening, with forecasters warning that dangerous wind gusts could reach up to 70 mph. The warning remained in place through 9 p.m. MDT on May 28, affecting residents across Canyon County and the broader Treasure Valley region.
What to Expect From the Storm
The severe thunderstorm warning covered Boise, Nampa, and nearby communities, placing a wide swath of southwest Idaho under alert for potentially damaging winds. Gusts of up to 70 mph pose a significant hazard to structures, vehicles, and outdoor activities. Even after the formal warning expires, winds are expected to persist through the overnight hours, blowing out of the south at sustained speeds of 15 to 20 mph with additional gusts reaching up to 30 mph.
Residents in Nampa, Caldwell, Middleton, and throughout Canyon County are encouraged to stay indoors during peak storm activity and to secure any loose outdoor items — lawn furniture, equipment, or debris — that could become projectiles in high-wind conditions. Drivers should exercise extra caution on highways and open stretches of road where crosswinds can affect vehicle control.
Impact on Canyon County Residents
For Canyon County families, severe thunderstorm events of this intensity can cause downed power lines, damaged fencing and outbuildings, and disruption to agricultural operations — particularly during late spring when field work and outdoor livestock management are in full swing. Residents near open terrain around Lake Lowell and the Deer Flat area should be especially alert, as open water and exposed ground offer little natural windbreak against strong gusts. With summer recreational season approaching, authorities are urging caution. Lake Lowell recently opened for boating, and anyone planning to be on or near the water should monitor conditions closely before heading out.
Parents with children involved in outdoor sports or end-of-school-year activities should monitor local conditions and heed any guidance from Canyon County emergency managers regarding event cancellations or postponements.
Separately, emergency communications crews remain on standby during severe weather events. Those interested in supporting emergency response in the region can find more information on opportunities such as 911 dispatcher positions currently being filled in the area.
What Comes Next
Residents should keep a close eye on updated forecasts from the National Weather Service as the storm system moves through the region. If you experience a downed power line, report it immediately to your utility provider and keep a safe distance. In the event of a weather-related emergency, dial 911 and do not attempt to cross flooded roadways or move downed lines.
Canyon County families are advised to have an emergency kit on hand — including flashlights, batteries, bottled water, and a battery-powered weather radio — in the event of extended power outages. Severe weather can move quickly across the Treasure Valley’s open terrain, and conditions may change rapidly even after formal warnings expire.
For statewide weather alerts and coverage of storm impacts across Idaho, visit Idaho News.