2 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 2 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 16, 7:42 PM MST, 4 hours 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE IDAHO 842 PM MDT MON AUG 16 2004 .DISCUSSION...FLASH FLOOD WATCH WILL EXPIRE ON SCHEDULE AT 04Z AS DARKNESS SHOULD DECREASE CONVECTION. BOI 00Z RAOB STILL VERY MOIST WITH 1.07 INCH PW BUT MEAN FLOW IS FASTER THAN LAST NIGHT. AS OF 02Z MALHEUR COUNTY/OR WAS STILL CONVECTIVELY ACTIVE WITH THUNDERSTORMS MOVING NORTH AND EVENTUALLY NORTHEAST INTO VALLEY COUNTY/ID. KCBX RADAR INDICATED +RA IN NW MALHEUR COUNTY POSSIBLY EXCEEDING 1 INCH ALTHOUGH INITIAL STORMS HAVE MOVED AWAY. WE/RE MONITORING NEW CELLS APPROACHING FROM CENTRAL MALHEUR COUNTY FOR POSSIBLE FLASH FLOOD WARNING LATER TONIGHT NORTH OF JUNTURA. CURRENT POPS IN ERN OREGON WILL BE RAISED IN UPDATE THIS EVENING ...AVAILABLE BY 0315Z. GENERAL IDEA IN PROGS IS TO SHIFT MAX POPS EWD FROM OREGON INTO IDAHO TUESDAY THEN SEWD AND SLOWLY OUT OF OUR IDAHO ZONES WED. WITH RAIN NOW BECOMING MORE WIDESPREAD IN OREGON ZONES...CURRENT POPS IN IDAHO ZONES SEEM TOO LOW TUESDAY BUT UPDATE THIS EVENING WILL ONLY ADDRESS TONIGHT/S FORECAST. && .PREVIOUS DISCUSSION... SHORT TERM...PLENTY OF MOISTURE AVAILABLE OVER THE FORECAST AREA FOR NEXT FEW DAYS. UPPER LOW OVER NEVADA WILL PUSH SLOWLY EAST WELL SOUTH OF THE FORECAST AREA...AND ROTATE WEAK SHORT WAVES OVER THE AREA. ONE PUSHING UP FROM NEVADA/UTAH THIS AFTERNOON. EXPECT THUNDERSTORMS TO DEVELOP ON THE NORTH AND WEST FRINGE OF APPROACHING CLOUD COVER...AND POTENTIAL FOR HEAVY RAIN IS THERE...SO WILL KEEP THE FLASH FLOOD WATCH IN PLACE THROUGH 10 PM MDT. ON TUESDAY...THERE MAY BE MORE CLOUDS EVERYWHERE TO INHIBIT HEATING SO WILL KEEP SCATTERED SHOWERS AND THUNDERSTORMS IN THE FORECAST...BUT WILL NOT HIGHLIGHT HEAVY RAIN. BY WEDNESDAY THE LOW SLOWLY SHIFTS EAST AND THE FAR WESTERN PARTS OF THE FORECAST AREA WILL HAVE LESS CHANCE OF PRECIP...BUT MOISTURE IS SLOW TO PULL OUT AND HAVE KEPT SOME CHANCE OF PRECIP IN THE EASTERN PART OF THE FORECAST AREA EVEN INTO THURSDAY. TEMPERATURES WELL BELOW NORMAL ON TUESDAY WITH LOTS OF CLOUD COVER...REBOUNDING SLOWLY TO ABOVE NORMAL THURSDAY AS CLOUDS DIMINISH. LONG TERM...THURSDAY NIGHT THROUGH MONDAY...DRIER FLOW WITH TEMPERATURES REMAINING ABOVE NORMAL THROUGHOUT THE PERIOD. LONG WAVE RIDGE TO THE WEST WITH NORTHWESTERLY FLOW...THIS SHOULD DRY THINGS OUT SOMEWHAT TO START THE PERIOD. COOLER BIAS ON MINS FRI AND SAT MORN AS CLEAR CONDITIONS COULD LEAD TO TEMPERATURE FALLS BELOW WHAT IS CURRENTLY ANTICIPATED. SOME MOISTURE WILL CREEP BACK IN OVER THE SOUTHWESTERN PORTION OF THE CWA BY LATE FRIDAY FOR SOME AFTERNOON CLOUD BUILD-UPS AND PERHAPS A SLIGHT CHANCE OF THUNDERSTORMS FRIDAY AND SATURDAY AFTERNOONS/EVENINGS. A PACIFIC WAVE MOVES ACROSS THE AREA ON SUNDAY...LOWERING HEIGHTS AND COOLING TEMPERATURES SLIGHTLY. MUCH DISAGREEMENT...AND CONSEQUENTLY LOW FORECAST CONFIDENCE...WITH THE DETAILS OF THIS FEATURE...HOWEVER ALL MODELS AGREE TO A FLATTENING OF THE RIDGE ON SUNDAY. HEIGHTS CONTINUE TO LOWER ON MONDAY AS THE GULF OF ALASKA LOW APPROACHES THE PACIFIC NORTHWEST COAST. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...FLOOD WATCH FOR FLASH FLOODING THROUGH 10 PM MDT. OR...FLOOD WATCH FOR FLASH FLOODING THROUGH 9 PM PDT. && DISCUSSION.......LC PREV SHORT TERM..TB PREV LONG TERM...RH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 600 AM MDT MON AUG 16 2004 IDZ011>016-028>030-ORZ061>064-171200- 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) MON AUG 16 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...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
2 flash flood. Local standard time, as filed.
Middle Fork Rd closed near Phifer Creek from a mud slide due to heavy rain.
Heavy rain caused two mud slides on Grimes Creek RD. One at mile post 2.2 and one futher up.
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: 5425958, 5425959.