A Red Flag Warning is in effect across parts of eastern Idaho today, signaling heightened wildfire risks due to warm, dry conditions and gusty winds before a significant weather shift arrives this weekend. According to localnews8.com, the warning covers the Upper Snake Plain, the Idaho National Laboratory, and Bureau of Land Management areas near Idaho Falls from noon until 8 p.m.
The National Weather Service forecasts temperatures in Idaho Falls reaching 83 degrees today. As high pressure weakens and a trough moves inland from the Pacific Northwest, relative humidity is expected to drop below 15% on Thursday afternoon. Southwest winds will gust around 30 mph, with valley winds ranging between 15 and 20 mph. The strongest gusts are anticipated near the Arco Desert and the Idaho National Laboratory.
Temperatures will fall into the 40s and 50s Thursday night under mostly clear skies. Friday will remain warm and breezy, with valley temperatures hovering around 80 degrees and wind gusts reaching the 30s. Saturday offers a final surge of summer heat, pushing lower elevation temperatures into the low-to-mid 80s.
Cold Front Arrival
A potent cold front driven by a Pacific Northwest trough will move through the region late Saturday into Sunday, bringing a sharp temperature drop and precipitation. Cloud cover and wind speeds are expected to increase late Saturday, with rain chances developing overnight in northern areas.
The Snake River Plain will see temperatures plummet from the 80s to the 60s by Sunday. In Idaho Falls specifically, temperatures are forecast to drop to near 63 degrees following the front’s passage. Precipitation is expected primarily as rain in valley locations, including Jackson, Wyoming, alongside the cooler air mass.
Higher elevations will see different conditions. Increased precipitation chances are forecast for the Central Mountains, Continental Divide, Island Park, and western Wyoming. Snow levels will drop behind the front, creating potential for snow above 8,000 feet across higher peaks in central Idaho and western Wyoming.
Weekend Outlook
The weather pattern is set to stabilize early next week. High pressure is forecasted to return on Monday, bringing drier conditions and a gradual warming trend into the following days. This shift will mark the end of the weekend’s unsettled weather and the arrival of more typical autumn conditions for the region.