Flash Flood, Bannock
- When
- August 17, 11:39 AM MST to 12:20 PM MST
- Where
- Bannock County, Inkom
- Reported by
- TRAINED SPOTTER
- Coordinates
- 42.669, -112.225 (the zone’s center; the record gives no point)
Flash Flood in Idaho, August 17, 2004
25 inches of rain fell in 45 minutes in Inkom area.
Where it happened
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What happened
The episode as NWS PIH wrote it up.
1.25 inches of rain fell in 45 minutes in Inkom area.
What forecasters said that day
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 Pocatello, ID wrote its last area forecast discussion before the first event at Aug 17, 9:25 AM MST, 2 hours 14 minutes earlier.
Area forecast discussion, Aug 17, 9:25 AM MST, 2 hours 14 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO IDAHO 1025 AM MDT TUE AUG 17 2004 .DISCUSSION... PRECIPITABLE WATERS IN KBOI SOUNDING OF NEARLY 1.5 INCHES INDICATES A VERY MOIST ATMOSPHERE OVERHEAD THIS AM. WITH THE LOW IN NORTHERN UTAH LIFTING NEWD TOWARDS THE ID-UT BORDER...HAVE GONE AHEAD WITH FLOOD WATCH FOR FLASH FLOODING IN THE WESTERN MOUNTAINOUS ZONES. FIXED WORDING IN ZONES TONIGHT TO REDUCE THE AMOUNT OF THUNDERSTORMS COMPARED TO THE AMOUNT OF RAIN SHOWERS. ALSO BOOSTED CLOUD COVER FOR THIS AFTERNOON AND EVENING SO THAT MOST LOCATIONS SAY MOSTLY CLOUDY. UPDATES ARE ALL OUT. && .PIH WATCHES/WARNING/ADVISORIES...A FLOOD WATCH FOR FLASH FLOODING HAS BEEN ISSUED FOR PORTIONS OF THE POCATELLO COUNTY WARNING AND FORECAST AREA. SEE THE FLOOD WATCH BULLETIN FOR FURTHER DETAILS. && JAM
Hazardous weather outlook, Aug 17, 11:10 AM MST, 29 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 1210 PM MDT TUE AUG 17 2004 IDZ017-019>021-181200- EASTERN MAGIC VALLEY-UPPER SNAKE HIGHLANDS- UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-1000 AM MDT TUE AUG 17 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO .DAY ONE... THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN... THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS AS THE UPPER LOW SLIDES AWAY FROM THE REGION. ISOLATED THUNDERSTORMS ARE POSSIBLE...WITH LOCALLY HEAVY DOWNPOURS. SPOTTER INFORMATION STATEMENT... WE ASK ALL TRAINED SPOTTERS TO REPORT SIGNIFICANT WEATHER CONDITIONS. THIS WOULD INCLUDE ALL HAIL...WIND...AND HEAVY RAIN REPORTS. THIS INFORMATION SHOULD BE CALLED INTO THE LOCAL NATIONAL WEATHER SERVICE OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER HOTLINE...OR OTHER STANDARD OPERATING PROCEDURES. IDZ018-022-023-031-032-181200- BIG AND LITTLE WOOD RIVER REGION-SAWTOOTH MOUNTAINS-LOST RIVER/PAHSIMEROI-SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS- 1000 AM MDT TUE AUG 17 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO .DAY ONE... VERY HEAVY RAINSHOWERS AND THUNDERSTORMS ARE EXPECTED IN THE CENTRAL IDAHO MOUNTAINS AND SOUTH CENTRAL HIGHLANDS THIS AFTERNOON AND EVENING UNTIL 10 PM. THESE SLOW MOVING SHOWERS AND STORMS MAY CREATE CONDITIONS SUITABLE FOR FLASH FLOODING IN THIS AREA. .DAYS TWO THROUGH SEVEN... THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS AS THE UPPER LOW SLIDES AWAY FROM THE REGION. ISOLATED THUNDERSTORMS ARE POSSIBLE...WITH LOCALLY HEAVY DOWNPOURS. SPOTTER INFORMATION STATEMENT... WE ASK ALL TRAINED SPOTTERS TO REPORT SIGNIFICANT WEATHER CONDITIONS. THIS WOULD INCLUDE ALL HAIL...WIND...AND HEAVY RAIN REPORTS. THIS INFORMATION SHOULD BE CALLED INTO THE LOCAL NATIONAL WEATHER SERVICE OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER HOTLINE...OR OTHER STANDARD OPERATING PROCEDURES.
The radar
The Pocatello radar (KSFX), 61 km away, was scanning. The volume nearest the first event began at 18:36 UTC.
Event by event
1 flash flood. Local standard time, as filed.
What these are
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Flash Flood and Damaging Wind in Georgia, August 17, 2004
- Hail and Damaging Winds in Michigan, August 17, 2004
- Hail and Damaging Winds in Missouri, August 17, 2004
- Flash Flood and Hail in Illinois, August 17, 2004
- Hail and Damaging Wind in Indiana, August 17, 2004
- Hail and Damaging Winds in Kansas, August 17, 2004
- Flash Flooding in Idaho, August 17 to 18, 2004
- Flash Flooding in Texas, August 17, 2004
- Hail in Missouri, August 17, 2004
- Damaging Winds in Georgia, August 17, 2004
- Hail in Missouri, August 17, 2004
- Flash Flood and Damaging Wind in North Carolina, August 17, 2004
More
Every storm in Idaho in 2004Every state in 2004This day in weather historyWarnings in Idaho, August 2004
Sources
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: 5420001.