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 Aug 26, 2:10 PM MST, 3 hours 35 minutes earlier.
SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 310 PM MDT MON AUG 26 2002 UPPER LEVEL TROUGH OVER THE NORTHERN ROCKIES IN THE PROCESS OF CLOSING OFF OVER SOUTHERN IDAHO AND ADJACENT AREAS...WHERE ACCORDING TO MODELS IT WILL REMAIN ISOLATED FROM THE WESTERLIES THROUGH WEDNESDAY NIGHT BEFORE BEING KICKED OUT THURSDAY BY A DEEPER TROUGH SETTLING OVER THE PACIFIC NORTHWEST FRIDAY. BY LABOR DAY MRF SHOWS THIS FILLING AND DRIFTING SOUTH WITH MAIN WESTERLY JET HOLDING JUST NORTH OF OUR CWFA FOR A DRY AND SOMEWHAT WARMER LAST DAY OF EXTENDED. CURRENTLY CONVECTION IS SCATTERED OVER CENTRAL IDAHO AND NORTHEAST OREGON MOUNTAINS AS WELL AS NORTHWARD OVER WESTERN MONTANA. COOL AIR ALOFT PLUS SURFACE HEATING OF RELATIVELY MOIST UNSTABLE AIRMASS SEEMS TO BE MAIN SUPPORT RATHER THAN DYNAMICS SO EXPECT CONVECTION TO FADE OUT BY LATE THIS EVENING WITH ONLY WIDELY SCATTERED SHOWERS REMAINING BY TUESDAY MORNING. THIS DIURNAL PATTERN SHOULD REPEAT TUESDAY AND WEDNESDAY WITH CHANCE POPS OVER THE MOUNTAINS NORTH OF THE SNAKE RIVER VALLEY AND SLIGHT CHANCE ELSEWHERE. TEMPERATURES WILL STAY A FEW DEGREES BELOW NORMAL FOR LATE AUGUST THROUGH SUNDAY. /JT .BOI...NONE.
The Boise radar (KCBX), 64 km away, was scanning. The volume nearest the first event began at 00:45 UTC.
1 flash flood. Local standard time, as filed.
Slow-moving thunderstorms dropped an estimated 3 to 4 inches of rain over steep terrain in north-central Elmore County washing out a section of Fire Road #156.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2002Every state in 2002This day in weather historyWarnings in Idaho, August 2002
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: 5316441.