Boise, Idaho – Idaho is expected to experience a warmer and more active weather pattern between July 23 and July 27, with above-normal temperatures expanding across much of the state while increasing atmospheric moisture supports periodic showers and thunderstorms. The combination of summer heat and afternoon instability could produce locally heavy rainfall, gusty winds and dangerous lightning, particularly across the mountains and central Idaho.
According to the National Oceanic and Atmospheric Administration’s Climate Prediction Center, in its 6-10 Day Outlook issued July 17, Idaho is favored to experience above-normal temperatures during the July 23-27 period. The state is also included in an area favoring above-normal precipitation, signaling a greater likelihood of showers and thunderstorms than is typical for late July.
In Boise, afternoon temperatures are expected to climb above seasonal averages as high pressure strengthens across the Intermountain West. Daytime heating will create favorable conditions for thunderstorms to develop over the Boise Foothills and nearby mountains before drifting into the Treasure Valley during the late afternoon and evening. Some storms could produce brief heavy rainfall, gusty outflow winds exceeding 40 mph, frequent cloud-to-ground lightning and isolated small hail.
Nearby Meridian is expected to experience a similar pattern, with hot afternoons followed by increasing thunderstorm chances later in the day. While many hours will remain dry, storms that develop could briefly reduce visibility, create slick roads and produce localized downpours. Residents planning outdoor activities should be prepared for rapidly changing weather conditions during the afternoon and evening.
The warmer and wetter pattern is expected to extend across Idaho, including Idaho Falls, Pocatello, Twin Falls, Coeur d’Alene, Lewiston, Nampa, Caldwell and Sun Valley. Mountain communities in the Sawtooth, Salmon and Bitterroot ranges are expected to see the greatest thunderstorm coverage, while southern Idaho valleys may experience isolated storms moving off higher terrain during the evening. Outdoor recreation areas could face heightened lightning concerns as storms develop over elevated terrain.
Although the Climate Prediction Center outlook does not pinpoint the exact timing or location of individual thunderstorms, confidence continues to increase that Idaho will remain in a warmer-than-normal and wetter-than-normal pattern through July 27. Residents should stay hydrated during the afternoon heat, monitor the sky for rapidly developing storms and follow updated National Weather Service forecasts for any severe thunderstorm or localized flood advisories as the pattern evolves.
