| Event |
Flash Flood |
| -- Flood Cause |
Heavy Rain |
| State |
IDAHO |
| County/Area |
NEZ PERCE |
| WFO |
OTX |
| Begin Date |
07/17/2012 18:30:00 PST-8 |
| Begin Range |
4 |
| Begin Azimuth |
SE |
| Begin Location |
CULDESAC |
| Begin Lat/Lon |
46.34/-116.61 |
| End Date |
07/17/2012 18:50:00 PST-8 |
| End Range |
4 |
| End Azimuth |
SE |
| End Location |
CULDESAC |
| End Lat/Lon |
46.34/-116.6 |
| Deaths Direct/Indirect |
0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect |
0/0 |
| Property Damage |
0.00K |
| Crop Damage |
0.00K |
| Episode Narrative |
An upper-level low sagging down the Pacific Northwest Coastline was responsible for drawing moist, unstable air northward into Northern Idaho. A combination of surface heating and shortwave energy ejecting from the low triggered strong thunderstorms over Northern Idaho during the afternoon of July 17th. Two thunderstorms that afternoon tracked over a similar stretch of Highway 95 just east of Culdesac. Heavy rainfall from the training thunderstorms, steep terrain, and an overwhelmed culvert were responsible for portions of the hillside at milepost 287, along Highway 95, to washout. These storms also produced wind gusts around 60 mph. |
| Event Narrative |
A portion of Highway 95 was covered in mud and debris when a flash flood caused a section of the hillside to collapse down the hillside into the highway. The water, mud, and debris flowed along the highway in a typically dry Lapwai Creek bed and eventually accumulating deep enough to flow back across the highway. There was no damage to the highway however, it took several hours for the highway department to remove the mud and debris from the roadway. |
