Heavy rain from thunderstorms caused flash flooding in House Rock Valley.
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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 episode as NWS FGZ wrote it up.
Heavy rain from thunderstorms caused flash flooding in House Rock Valley.
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 8, 3:18 PM MST, 4 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 318 PM MST SUN AUG 8 2010 .SYNOPSIS...A TROUGH OF LOW PRESSURE MOVING THROUGH CALIFORNIA AND NEVADA WILL LEAD TO CONTINUED SHOWERS AND THUNDERSTORMS OVER NORTHERN ARIZONA INTO THIS EVENING. A SIGNIFICANT DRYING TREND IS EXPECTED MONDAY AND TUESDAY AS DRIER AIR MOVES IN BEHIND THE TROUGH. HIGH PRESSURE WILL BUILD EAST OF ARIZONA WEDNESDAY THROUGH THE END OF THE WEEK WITH INCREASING MOISTURE OVER ARIZONA. && .DISCUSSION...NORTHERN ARIZONA IS BETWEEN A LARGE TROUGH OF LOW PRESSURE MOVING THROUGH SOUTHERN CALIFORNIA AND INTO NEVADA AND DEEP MOISTURE OVER EASTERN ARIZONA AND NEW MEXICO. THE TROUGH HAS TRIGGERED SEVERAL STRONG STORMS WITH SOME ROTATION OVER NORTHERN MOHAVE AND NORTHEASTERN PORTIONS OF COCONINO COUNTY NORTHWEST OF JACOB LAKE. ISOLATED MUCH WEAKER STORMS HAVE FORMED OVER THE HIGHER TERRAIN EAST AND NORTHEAST OF FLAGSTAFF. ISOLATED TO SCATTERED STORMS WILL CONTINUE THIS EVENING WITH THE STRONGEST STORMS EXPECTED NORTH OF FLAGSTAFF WHERE THE DYNAMICS OF THE TROUGH ARE STRONGER. FROM MONDAY THROUGH TUESDAY NIGHT...SIGNIFICANT DRYING SHOULD TAKE PLACE ACROSS MUCH OF NORTHERN ARIZONA AS A DRY SOUTHWEST FLOW DEVELOPS IN THE WAKE OF THE TROUGH. FROM WEDNESDAY THROUGH SATURDAY...HIGH PRESSURE IS EXPECTED TO BUILD EAST OF ARIZONA AND OVER THE FOUR CORNERS AREA. THIS WILL BRING WARMER TEMPERATURES AND INCREASING HUMIDITY. THE WARMEST DAY SHOULD BE THURSDAY BEFORE TEMPERATURES BEGIN TO DECREASE LATE IN THE WEEK. W && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && .AVIATION...FOR THE 00Z PACKAGE...ISOLD TO SCT SHRA/TSRA ACROSS NORTHERN IS EXPECT TO DIMINISH AFT 03Z MONDAY. ISOLD SHRA/TSRA IS POSSIBLE ACROSS FAR EASTERN ARIZONA AFT 17Z MONDAY. DISCUSSION NOT UPDATED FOR AMENDMENTS. && PUBLIC..................MAS AVIATION/FIRE WEATHER...CLARK VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 142 PM MST SUN AUG 8 2010 AZZ004>018-037>040-091100- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY- COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS- NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY- CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS- NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS- OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA- NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264- 142 PM MST SUN AUG 8 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ARIZONA...NORTH CENTRAL ARIZONA...NORTHEAST ARIZONA AND WEST CENTRAL ARIZONA. .DAY ONE...THIS AFTERNOON AND TONIGHT AMPLE MOISTURE AND AN APPROACHING TROUGH WILL COMBINE TO PRODUCE SCATTERED THUNDERSTORMS THROUGH THIS EVENING OVER NORTHERN ARIZONA. MODERATE RAIN IS EXPECTED IN STORMS AS THEY MOVE TO THE NORTHEAST AT AROUND 15 MPH. FEWER STORMS ARE EXPECTED OVER YAVAPAI COUNTY AS DRIER AIR HAS ALREADY ARRIVED. HOWEVER...DYNAMICS ASSOCIATED WITH THE APPROACHING TROUGH WILL PRODUCE STRONGER STORMS WITH STRONGER WINDS AND LARGER HAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY BY MONDAY....DRIER AIR IS FORECAST TO MOVE INTO ARIZONA FROM THE WEST. THIS SHOULD CAUSE A NOTICEABLE DECREASE IN THUNDERSTORM ACTIVITY MONDAY AND TUESDAY. MOISTURE AND THUNDERSTORM ACTIVITY WILL SLOWLY INCREASE WEDNESDAY THROUGH SATURDAY.
The Cedar City radar (KICX), 100 km away, was scanning. The volume nearest the first event began at 02:43 UTC.
1 flash flood, 1 hail. Local standard time, as filed.
The Bureau of Land Management reported flash flooding along House Rock Road--the road was river of water. Coyote Wash flooded over House Rock Road.
Penny sized hail was reported in the Buckskin Gulch and Coyote Buttes areas.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2010Every state in 2010This day in weather historyWarnings in Arizona, August 2010
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: 258453, 258460.