1 thunderstorm wind, as filed by the National Weather Service.
Every event with a place to put it. 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 31, 2:00 PM MST, 2 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 300 PM MDT TUE AUG 31 2004 .SHORT TERM...FOR SOUTHWEST IDAHO AND SOUTHEAST OREGON TODAY THROUGH FRIDAY. A BROAD UPPER RIDGE OVER THE WEST WILL WEAKEN TONIGHT AS A COLD FRONT OFFSHORE MOVES INLAND LATE TONIGHT. THE FRONT WILL BEGIN CROSSING SE OREGON WED AFTERNOON THEN REACH SW IDAHO WED EVENING. A SMALL CHANCE OF DRY-TYPE THUNDERSTORMS WILL PRECEDE THE FRONT TONIGHT OVER OUR FAR WESTERN ZONES. THE AIR MASS WILL MOISTEN UP DURING THE DAY WEDNESDAY AND BRING A SMALL CHANCE OF SHOWERS AND THUNDERSTORMS TO OUR NORTHERN AND WESTERN ZONES THEN SPREAD ACROSS OUR AREA WED NIGHT. ON THURSDAY A DRY BUT COOL DAY WILL TAKE OVER BEHIND THE FRONT. AN UPPER RIDGE WILL BEGIN BUILDING IN FROM THE WEST ON FRIDAY FOR ANOTHER DRY BUT SLIGHTLY WARMER DAY. TEMPERATURES WILL BE ABOUT 6 DEGREES ABOVE NORMAL ON WEDNESDAY AHEAD OF THE FRONT...10 DEGREES BELOW NORMAL ON THURSDAY BEHIND THE FRONT THEN 8 DEGREES BELOW NORMAL ON FRIDAY AS THE UPPER RIDGE BEGINS TO BUILD AGAIN. AS FOR WINDS...THEY WILL BE PICKING UP WEDNESDAY AFTERNOON OUT OF THE WEST AND CONTINUE GUSTY THROUGH THURSDAY. .LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...A DRY..STABLE AND WARM UPPER LEVEL RIDGE ORIGINATING IN THE FOUR CORNERS AREA OVERSPREADS SOUTHEAST OREGON AND SOUTHWEST IDAHO THROUGH THE PERIOD. TEMPERATURES WILL REMAIN CLOSE TO NORMAL THROUGH THE PERIOD. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && SHORT TERM...TE LONG TERM....DH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 600 AM MDT TUE AUG 31 2004 IDZ011>016-028>030-ORZ061>065-011200- BAKER COUNTY-BOISE MOUNTAINS-CAMAS PRAIRIE-HARNEY COUNTY- LOWER TREASURE VALLEY-MALHEUR COUNTY-OREGON LOWER TREASURE VALLEY- OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY-SOUTHWEST HIGHLANDS- UPPER TREASURE VALLEY-WEST CENTRAL MOUNTAINS-WESTERN MAGIC VALLEY- 600 AM MDT (500 AM PDT) TUE AUG 31 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST IDAHO AND SOUTHEAST OREGON. .DAY ONE...TODAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
The Boise radar (KCBX), 11 km away, was scanning. The volume nearest the first event began at 23:30 UTC.
1 thunderstorm wind. Local standard time, as filed.
Microburst winds...semi truck overturned, trees uprooted and roofs damaged.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2004Every state in 2004This day in weather historyWarnings in Idaho, August 2004
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: 5425961.