ESFPIH Temperatures today through Thursday will be well above averages, increasing low and mid elevation snowmelt and runoff. Standing water in typical low spots may occur, but we'll also likely begin seeing the swelling of smaller creeks and tributaries that feed the larger streams and rivers. This may even push some streams and creeks above bankfull causing minor flooding and bank erosion due to the higher flows. The warm temperatures will peak Wednesday with afternoon highs reaching above 60s and some locations in the South Hills and lower Snake Plain getting above 70 degrees. These will be the warmest readings of the year, thus far and will likely challenge daily records. While daytime high temperatures will garner most of the attention, the warm overnight low temperatures will likely remain well above freezing through Thursday, exacerbating snowmelt through the overnight hours. A cooldown is forecast to arrive late in the week with temperatures Friday and Saturday dipping back down towards normals, and overnight lows back to near freezing by Saturday morning. This cooldown, however, will be accompanied by increasing rain chances which could add to the runoff concerns. Stay away from fast moving water, swollen river banks and never attempt to cross flowing water over roadways.
