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 Jun 27, 7:47 PM MST, 3 hours 53 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 847 PM MDT SUN JUN 27 2004 .DISCUSSION...NWD-MOVING THUNDERSTORMS STRONGEST OVER OREGON ZONES THIS EVENING. ACTIVITY BEGAN NEAR VORT LOBE IN NEVADA EARLIER TODAY. AIR MASS MOISTENED SINCE SATURDAY BUT STILL HAD STEEP LAPSE RATES AND LARGE CAPE. STRONGEST CELLS FEATURED +RA AND HAIL...ALSO MORE LIGHTNING...BUT LESS WIND THAN YESTERDAY/S STORMS. AGAIN...ACTIVITY SHOULD PERSIST WELL INTO THE NIGHT BEING DRIVEN BY WAVE FROM THE SOUTH RATHER THAN DIURNALLY. LATEST PROGS CONTINUE TO EMPHASIZE OREGON ZONES FOR CONVECTION THROUGH TUE DUE TO WEAK UPPER TROUGH REMAINING OVER CALIF. .SHORT TERM...FORECAST ON TRACK WITH STORMS DEVELOPING OVER THE SOUTHERN BORDER WITH NEVADA WHILE THE REST OF THE AREA APPEARS QUIET FOR THE TIME BEING. UPPER LEVEL VORT MAX CONTINUES TO MAKE SLOW PROGRESS NORTH FROM NEVADA AND SHOULD BE THE FOCUS OF CONVECTION THROUGH THE LATE AFTERNOON AND EVENING HOURS. MEANWHILE, A WEDGE OF DRY AIR PRESSING INTO EASTERN OREGON APPEARS TO BE GETTING PINCHED OFF BY THE PLUME FORM THE SOUTH. BUT SO FAR CONVECTION OVER EASTERN OREGON HAS BEEN CAPPED/SUPPRESSED. LATEST MODELS CONTINUE TO SHOW THE GREATEST CONVECTIVE THREAT SOUTH OF THE SNAKE RIVER THIS EVENING AND EXTENDING WESTWARD THROUGH SOUTHERN MALHEUR COUNTY IN OREGON. ONLY ISOLATED CONVECTION EXPECTED OVER THE NORTHERN MOUNTAINS IN THE SLIGHTLY MORE STABLE AIR MASS THERE. STORMS THAT FORM TODAY WILL CERTAINLY BE SLOW MOVING AND WITH PW VALUES APPROACHING ONE INCH, WILL BE CAPABLE OF HEAVY RAIN. WILL INCLUDE ENHANCED WORDING FOR POTENTIAL HEAVY RAIN IN THE GRIDS ACROSS SOUTHERN MOST AREAS. ON MONDAY MAIN AXIS OF INSTABILITY AND MOISTURE SHIFTS WESTWARD INTO OREGON WHERE ACTIVITY IS MINIMAL TODAY. THIS POSITION ALONG WITH LOWEST LIS AND WEAK TO MODERATE SHEAR WILL BRING THUNDERSTORMS CLOSER TO THE POPULATION CENTERS BY MONDAY EVENING. THE FORECAST REMAINS OPEN TO SOUTHERLY FLOW OVER THE NEXT FEW DAYS WITH MOISTURE AND INSTABILITY BEING SUFFICIENT TO PRODUCE AFTERNOON/EVENING DIURNAL CONVECTION EACH DAY. THERMAL AXIS A LITTLE SUPPRESSED TODAY AND POSITIONED FARTHER EAST OVER CENTRAL IDAHO SO TEMPS SHOULD STRUGGLE TO MAKE IT ABOVE 90F. THERMAL FEATURE INCHES BACK WESTWARD DURING THE EARLY PART OF THE WEEK WITH POTENTIALLY WARMER TEMPS AND A FOCUSING BOUNDARY FOR CONVECTION CLOSER TO SOUTHWEST IDAHO AND EASTERN OREGON. .LONG TERM...WEDNESDAY NIGHT THROUGH SATURDAY. SOUTHERLY FLOW FROM NEVADA TO CONTINUE TO BRING WARM AIR AND MOISTURE TO THE FORECAST AREA THROUGH FRIDAY. SLIGHT CHANCE OF DAILY AFTERNOON THUNDERSTORMS AND TEMPERATURES SLIGHTLY ABOVE NORMAL THROUGH FRIDAY. SLOW SHIFT TO MORE WESTERLY FLOW ON SATURDAY AND SUNDAY...WITH A LITTLE DRYING AND A SLOW COOLING TREND. VERY LITTLE CHANGE TO CURRENT FORECASTS. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && DISCUSSION........LC PREV SHORT TERM...GS PREV LONG TERM....TB
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 530 AM MDT SUN JUN 27 2004 IDZ011>016-028>030-ORZ061>064-281200- 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- 530 AM MDT (430 AM PDT) SUN JUN 27 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...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.
The Boise radar (KCBX), 69 km away, was scanning. The volume nearest the first event began at 06:42 UTC.
1 flash flood. Local standard time, as filed.
Heavyrain from a slow moving Thunderstorm caused Flash Flooding which washed out a road near Twin Springs along the Boise River on the Boise/Elmore County line.
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, June 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: 5410211.