Heavy Rain in Nez Perce County, Idaho

A CWOP mesonet site in Lewiston recorded 0.51 in twenty minutes. The intense rainfall overwhelmed the city's infrastructure leading to urban flooding and closed streets. Among the closures were G Street, Adams Lane, and Idaho Street. Nearly a foot of water was observed on sections of the blue bridge. The water receded within an hour and no injuries or damage was reported in this event.

During the end of June 2013, the Inland Northwest experienced a very moist atmosphere for several days. Constant moistening of the atmosphere from several waves of rainfall and lack of wind or dry air led to surface dewpoints in the 50s to mid-60s and layer precipitable water values between 1.00 and 1.50 inches. Afternoon heating during the afternoon of June 26th fueled low-centroid thunderstorms that quickly produced tropical-like downpours. One of these showers moved over the city of Lewiston leading to brief urban flooding.