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 3, 1:59 PM MST, 31 minutes earlier.
SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 259 PM MDT SUN AUG 3 2003 AIR MASS REMAINS UNSTABLE AND MOIST OVER MOST OF THE AREA. LOOKS LIKE STABIZING TAKING PLACE IN OREGON ZONES AS CLOUD TOPS NOT SO COLD AND ONLY LIGHTNING IS EXTREME SOUTHEAST. MOST UNSTABLE AIR IS EXTREME SOUTHAST PORTION OF OUR FORECAST AREA. THESE STORMS ARE STRONGEST BUT APPEAR TO NOT COME CLOSE TO SEVERE LIMITS AND THEY DONT LAST LONG. UPPER TROF WILL MOVE THROUGH LATER THIS EVENIGN SO EXPECT TO SEE SHOWER ACTIVITY GRADUALLY DIMINISH THROUGH MIDNIGHT TONIGHT. CLOUDS WILL BE SLOW TO CLEAR OUT SO HAVE NOT GONE WITH MUCH CLEARING TONIGHT. SHORT WAVE RIDGE COMES IN ON MONDAY TO PUT A DAMPER ON SHOWER ACTIVITY. WILL BE SOME RESIDUAL MOISTURE LEFT BEHIND BUT DO NOT SEE ANY FORCING TO GET THE SHOWERS ACTIVATED. SO HAVE KEPT POPS LOW THROUGH DAY MONDAY UNTIL THE EVENING WHEN ANOTHER SHORT WAVE COMES UP FROM THE SOUTHWEST. RIGHT BEHIND SHORT WAVE RIDGE MONDAY AFTERNOON COMES ANOTHER SHORT WAVE TROUGH FROM THE SW WITH CHANCE OF THUNDERSTORMS AGAIN IN WRN AND THEN NRN ZONES MON NIGHT. PACIFIC LOW OFF CALIF STILL FORECAST TO MOVE TO NRN CALIF COAST AS PROGGED PAST THREE DAYS...ROTATING SEVERAL WEAKER SHORT WAVE TROUGHS NWD THROUGH WRN ZONES THROUGH THU. STRONG SLY COMPONENT WILL SLOWLY RAISE TEMPS THROUGH THU... OFFSET IN PART BY COOL AIR FROM THE UPPER LOW. LOW MEETS ANOTHER TROUGH DIGGING SWD ALONG BC COAST THU FORMING A RELATIVELY STRONG COOL TROUGH OFF NW COAST...CLOSE ENOUGH FOR SLIGHT COOLING IN OREGON ZONES. BUT WARMING AND DRYING WILL CONTINUE INTO WEEKEND IN IDAHO ZONES...FURTHER AWAY FROM THE TROUGH. .BOI...NONE. = PRF/L COLIN
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Heavy rain over a recent forest fire burn area caused a flash flood which washed mud and debris into the Boise River and across the roadway near Hot Creek west of Atlanta. Road was closed for several days and needed major repairs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2003Every state in 2003This day in weather historyWarnings in Idaho, August 2003
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: 5374635.