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 Jul 1, 2:45 PM MST, 4 hours 15 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE IDAHO
345 PM MDT THU JUL 1 2004
.DISCUSSION...FOR SOUTHWEST IDAHO AND SOUTHEAST OREGON FOR THE
REMAINDER OF TONIGHT. AS OF 830 PM MDT...ONLY ONE AREA OF SHOWERS
AND THUNDERSTORMS REMAINED...IT WAS CENTERED ALONG THE OREGON AND
IDAHO BORDER SOUTH OF ONTARIO AND WAS ABOUT 75 MILES WIDE. THE AREA
WAS MOVING SLOWLY TO THE EAST AND PUT DOWN AROUND 3/4 OF AN INCH OF
RAIN NEAR HOMEDALE AND MARSING IN A SHORT PERIOD OF TIME. HAVE
ALREADY UPDATED THE ZONES FOR HIGHER POPS IN THAT AREA. NO FURTHER
UPDATES AT THIS TIME.
&&
.PREVIOUS DISCUSSION...AFTERNOON CONVECTION OVER THE BLUE MTS
TRIGGERED HEAVY RAIN NEAR UNITY WITH ABOUT AN INCH AN HOUR WITH SOME
TRAINING NOTED ON RADAR/SATIMG THAT WE WILL MONITOR THIS EVENING.
ANOTHER AREA IS IN THE FAR EASTERN PARTS OF VALLEY/BOISE COUNTY AND
OVER SOUTHERN MTS THROUGH OWYHEE AND TWF COUNTIES...WHICH SHOULD
LINGER LATER AS IT IS ASSOCIATED WITH AN H7 TROF AND REMNANT VERY
MOIST AIR OVER SE ZONES. INSTABILITY IS DOWN ABOUT 10 PCT FROM
YESTERDAY WHILE SHEAR IS UP TO 35 KTS IN PLACES...CONTRIBUTING TO
LESS THREAT OF SEVERE STORMS TONIGHT. TRAINING ECHOES IN BKE COUNTY
SOME CONCERN FOR FLASH FLOODING BUT WESTERLY FLOW THERE IS A LITTLE
DRIER THAN PREV DAYS. DIURNAL MIN IN CONVECTION LATE TONIGHT AND FRI
AM THEN ISOLD MAINLY MT THUNDERSTORMS FRIDAY AFTERNOON AND EVENING.
WEAK WAVE THROUGH THE REGION SATURDAY FOR BETTER LG SCALE FORCING
FOR SAT AFTN AND EVE THUNDERSTORMS THEN WEAKER FLOW BUT STILL A
SLIGHT CHC FOR DIURNALLY FORCED THUNDERSTORMS SUNDAY AFTERNOON.
TEMPS NEAR AVERAGE WITH LITTLE CHANGE THROUGH THE SHORT TERM.
.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY...MUCH BETTER MODEL
AGREEMENT TODAY FOR THE EXTENDED PERIOD WITH MODELS CONVERGING ON
YESTERDAY/S...AND TODAY AS WELL...ECMWF/CANADIAN SOLUTION. UPPER
LEVEL TROUGH EXITS TO THE EAST ON MONDAY WITH SOME RESIDUAL
CLOUDINESS EARLY DAY. A WEAKLY AMPLIFIED RIDGE IS TO FOLLOW FOR
MONDAY AFTERNOON THROUGH TUESDAY. WARMER CHANGES TO TEMPS TODAY FOR
MONDAY AND TUESDAY BRINGING TEMPS BACK NEAR NORMAL AS MUCH BETTER
CONFIDENCE IN THE RIDGE EXISTS TODAY. NEXT SYSTEM ON TAP FOR LATE
WEDNESDAY INTO EARLY THURSDAY WITH SLIGHT CHANCE POPS IN THE WEST
CENTRAL AND BOISE MOUNTAINS...AND ANOTHER COOL DOWN TO SLIGHTLY
BELOW NORMAL. TEMPERATURES AVERAGE SLIGHTLY BELOW NORMAL FOR THE
BALANCE OF THE PERIOD.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...URBAN AND SMALL STREAM ADVISORY FOR CANYON AND OWYHEE COUNTIES
TILL 945 PM MDT.
OR...NONE.
DISCUSSION...TE
PREV DISC....VM
LONG TERM....RHHAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BOISE ID 155 PM MDT THU JUL 01 2004 IDZ011>016-028>030-ORZ061>064-021200- 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- 155 PM MDT (1255 PM PDT) THU JUL 01 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...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.
The Boise radar (KCBX), 101 km away, was scanning. The volume nearest the first event began at 01:59 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain from slow moving Thunderstorms caused Sage Creek to over flow its banks, nearby homes were threatened with flooding and a section of a road in the area was washed out.
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, July 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: 5414093.