1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Boise, ID wrote its last area forecast discussion before the first event at Sep 16, 1:50 PM MST, 4 hours 40 minutes earlier.
SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 250 PM MDT SUN SEP 16 2001 THUNDERSTORMS FORMING NEAR TWO UPPER LEVEL CIRCULATION CENTERS UPSTREAM FROM US THIS AFTERNOON. AT 20Z ONE CENTER IS ABOUT 80 MILES WEST OF BAKER/OR AND THE OTHER ALONG NRN CALIF/NWRN NV BORDER. SRN CENTER HAS MORE DYNAMICS AND WILL PROVIDE A CHANCE OF SHOWERS/THUNDERSTORMS ACROSS SRN IDAHO THIS EVENING SOUTH OF THE SNAKE RIVER AS IT MOVES EAST ACROSS NRN NEVADA. NRN CENTER HAS MORE MOISTURE WITH SURFACE DEW POINTS >50 DEGS F. +TSRA POSSIBLE IN NRN ZONES IN IDAHO THIS EVENING AS NRN CENTER DRIFTS EAST BUT FLASH FLOODING IS UNLIKELY. HOWEVER AFTER THURSDAYS RAINS...ROCK AND MUD SLIDES ARE STILL POSSIBLE FROM EVEN MODERATE SHOWERS. ETA DOES SHOW MOISTURE CURRENTLY IN NRN OREGON SHIFTING TO OUR NRN IDAHO ZONES THIS EVENING AND STAYING THERE THROUGH MONDAY MORNING. CLEARING WEST TO EAST LATER MONDAY AS SHORT WAVE RIDGE ALONG COAST SHIFTS INLAND. RIDGE AXIS PASSES THROUGH CWA TUESDAY WITH MOSTLY SUNNY SKIES AND SLIGHTLY WARMER TEMPS BUT ETA AND AVN BOTH SHOW MOISTURE JUST BEHIND RIDGE AXIS WHICH WILL BRING CLOUDS AND SLIGHT CHANCE OF SHOWERS INTO NRN ZONES TUESDAY AFTERNOON. EXTENDED...NEXT TROUGH SLIDES EWD ACROSS NRN ZONES WEDNESDAY WITH AVN WEAKER ON THAT TROUGH THAN IT WAS YESTERDAY. EXPECT CLOUDS AND COOLER/BREEZY WX IN NRN ZONES BUT MOSTLY SUNNY WX AND ONLY SLIGHT COOLING IN SRN ZONES. STRONGER N PACIFIC TROUGH COMES IN NEXT WEEKEND WITH MRF INDICATING PCPN OVER MOST AREAS SATURDAY NIGHT AND SUNDAY MORNING ALONG WITH SIGNIFICANT COOLING. L COLIN .BOI...NONE.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Flash flooding and mudslides occurred along the Payette River near Banks after a brief, heavy downpour. This was in the same area affected by flash flooding three days earlier. Cost of cleanup was included in the estimate of cleaning up the mudslides of the 13th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2001Every state in 2001This day in weather historyWarnings in Idaho, September 2001
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5269249.