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 Flagstaff, AZ wrote its last area forecast discussion before the first event at Aug 18, 9:15 AM MST, 5 hours 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 915 AM MST WED AUG 18 2004 .SYNOPSIS...SCATTERED SHOWERS AND THUNDERSTORMS WILL AGAIN DEVELOP TODAY DURING THE LATE MORNING AND AFTERNOON HOURS OVER NORTHERN ARIZONA. ON THURSDAY...A WEATHER DISTURBANCE WILL MOVE ACROSS NORTHEAST ARIZONA WITH A CHANCE FOR STRONG THUNDERSTORMS. AREAL COVERAGE OF THUNDERSTORMS WILL DECREASE ELSEWHERE ON THURSDAY AS DRIER AIR FILTERS IN FROM THE NORTHWEST. A STORM SYSTEM WILL DEVELOP OVER THE WESTERN U.S. BY THE MIDDLE OF NEXT WEEK BRINGING BELOW NORMAL TEMPERATURES AND A CHANCE OF SHOWERS TO THE NORTHLAND. && .DISCUSSION...NORTHERN ARIZONA IS UNDER A NORTHWEST FLOW TODAY ON THE SOUTHWEST SIDE OF AN UPPER LOW OVER NORTHEAST UTAH. PRECIPITABLE WATER VALUES CONTINUE A SLOW DECLINE AS THE AIR TO OUR NORTHWEST IS SLIGHTLY DRIER. HOWEVER...THIS IS BEING OFFSET BY COOLER THAN AVERAGE TEMPERATURES ALOFT AND STEEP MID LEVEL LAPSE RATES. AN AREA OF SHOWERS AND THUNDERSTORMS MOVED INTO FAR NORTHERN COCONINO COUNTY EARLY THIS MORNING INDICATING UPPER LEVEL SUPPORT FROM THE TROUGH. THESE SHOWERS ARE DISSIPATING AND SHOULD HAVE LITTLE EFFECT ON CONVECTION LATER TODAY. EXPECTING ANOTHER ACTIVE AFTERNOON WITH MODIFIED CAPE VALUES AT KFGZ NEAR 800 J/KG. DEEP LAYER MOISTURE OVER SOUTHERN YAVAPAI COUNTY IS LESS THAN YESTERDAY...AND THIS MAY DECREASE THE CHANCE OF A REPEAT OF YESTERDAYS FLOODING RAINS IN THAT AREA. HOWEVER...STEERING FLOW FROM THE NORTHWEST POINTS TO THE POSSIBILITY OF TRAINING STORMS AGAIN OVER THE NW/SE ORIENTED MTN RANGES OF YAVAPAI COUNTY. POP GRIDS FOR THIS AFTERNOON LOOK GOOD WITH 30-40 PERCENT ALL AREAS. TROUGH AXIS WILL MOVE ACROSS FAR NORTHERN AND NORTHEASTERN AZ LATE TONIGHT THROUGH THURSDAY. THUS WILL LEAVE POPS IN OVERNIGHT IN THESE AREAS. SPEED AND DIRECTIONAL SHEAR PROFILES NEAR THE 4-CORNERS THURSDAY AFTERNOON SUGGEST POSSIBILITY OF ORGANIZED STORMS WITH ISOLATED SEVERE. FRIDAY THROUGH SUNDAY WILL SHOW A DRYING TREND AS A DRIER SOUTHWEST FLOW DEVELOPS. WE WILL RETAIN VERY LOW POPS FOR THIS PERIOD FROM THE RIM NORTHWARD AS MID LEVEL TEMPERATURES REMAIN BELOW AVERAGE FOR THIS TIME OF YEAR. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && JOHNDROW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1000 AM MST WED AUG 18 2004 AZZ004>018-037>040-191400- WESTERN MOGOLLON RIM-GRAND CANYON COUNTRY-YAVAPAI COUNTY MOUNTAINS- YAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONS- MARBLE AND GLEN CANYONS-KAIBAB PLATEAU-COCONINO PLATEAU- NORTHEAST PLATEAU AND MESAS HWY 264 NORTHWARD- NORTHEAST PLATEAU AND MESAS SOUTH OF HWY 264- CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- BLACK MESA AREA-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- EASTERN MOGOLLON RIM-WHITE MOUNTAINS-NORTHERN GILA COUNTY- 1000 AM MST WED AUG 18 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY THE AIRMASS ACROSS NORTHERN ARIZONA REMAINS UNSTABLE THIS MORNING. AS A RESULT...EXPECT SCATTERED SHOWERS AND THUNDERSTORMS TO DEVELOP OVER THE HIGHER TERRAIN AFTER 11 AM MST. STORMS WILL MOVE INTO THE VALLEY LOCATIONS DURING THE AFTERNOON. A FEW OF THE STORMS TODAY WILL HAVE HAIL NEAR ONE HALF INCH IN DIAMETER AND VERY HEAVY RAIN. THERE IS ALSO A THREAT OF TRAINING STORMS OVER YAVAPAI COUNTY THIS AFTERNOON WITH HEAVY RAINFALL AND LOCALIZED FLOODING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A WEATHER DISTURBANCE WILL MOVE ACROSS NORTHERN NAVAJO AND APACHE COUNTIES THURSDAY. THIS WILL ENHANCE THUNDERSTORM CHANCES IN THIS AREA...WITH A THREAT FOR A FEW SEVERE STORMS IN THE AFTERNOON. AREAL COVERAGE OF THUNDERSTORMS IS EXPECTED TO DECREASE ELSEWHERE ON THURSDAY. THE FLOW ALOFT WILL TURN TO A DRIER WESTERLY DIRECTION FOR FRIDAY THROUGH THE WEEKEND. ISOLATED THUNDERSTORMS ARE STILL POSSIBLE DURING THIS TIME BUT MOST LOCATIONS WILL REMAIN DRY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 124 km away, was scanning. The volume nearest the first event began at 21:57 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain caused flash flooding just 5 miles west of Sedona on Highway 89. The Highway was closed for two hours as crews cleared mud, rocks, and debris from the road. One intersection was covered with two feet of water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2004Every state in 2004This day in weather historyWarnings in Arizona, 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: 5419984.