Thunderstorms in the Page area produced flash flooding in Antelope Canyon.
Every event with a place to put it. 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 episode as NWS FGZ wrote it up.
Thunderstorms in the Page area produced flash flooding in Antelope Canyon.
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 9, 4:17 PM MST, 43 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 417 PM MST SUN AUG 9 2015 .SYNOPSIS...DEEPER MOISTURE WILL BEGIN TO RETURN ON MONDAY WITH A SUBSTANTIAL INCREASE IN COVERAGE OF THUNDERSTORMS EXPECTED. A MUCH WETTER MONSOON PATTERN WILL CONTINUE ON TUESDAY...WITH STORMS CONTINUING ESPECIALLY IN WESTERN PORTIONS OF THE AREA ON WEDNESDAY. DRIER CONDITIONS ARE FORECAST TO RETURN FOR THE SECOND HALF OF THE WORK WEEK. && .DISCUSSION... COVERAGE OF THUNDERSTORMS WAS IN FACT LESS TODAY THAN ON FRIDAY/SATURDAY...BUT A FEW OF THE STORMS THAT WE DID SEE WERE QUITE ROBUST. THREE STORMS ACCESSED ENOUGH INSTABILITY AND SHEAR TO LIKELY PRODUCE LARGE HAIL...WITH ONE STORM POSSIBLY HAVING PRODUCED A TORNADO. EXPECT DECREASING COVERAGE AND WEAKER STORMS THIS EVENING. LOOK FOR AN INCREASE IN SHOWER/THUNDERSTORM ACTIVITY ON MONDAY AND ESPECIALLY TUESDAY AS MOISTURE STREAMS INTO NORTHERN ARIZONA BETWEEN A TROUGH OFF THE PACIFIC COAST AND A RIDGE CENTERED OVER THE SOUTHERN PLAINS. AS THE RIDGE MIGRATES WESTWARD FROM MID TO LATE WEEK...EXPECT A DOWNTURN IN SHOWER/STORM ACTIVITY AND WARMING TEMPERATURES. && .AVIATION...FOR THE 00Z PACKAGE...ISOLATED TO SCATTERED SHRA/TSRA TO CONTINUE ACROSS MUCH OF NORTHERN ARIZONA THROUGH THIS EVENING. MVFR/IFR CONDITIONS ARE POSSIBLE NEAR THE STRONGEST STORMS. ANOTHER ROUND OF ISOLATED TO SCATTERED SHRA/TSRA IS FORECAST AFTER 17Z MONDAY. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...AT AVIATION...RR FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1226 PM MST SUN AUG 9 2015 AZZ008-037-092000- YAVAPAI COUNTY MOUNTAINS-YAVAPAI COUNTY VALLEYS AND BASINS- 1226 PM MST SUN AUG 9 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL YAVAPAI COUNTY UNTIL 100 PM MST... AT 1224 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR CHINO VALLEY...MOVING NORTHEAST AT 10 MPH. DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM...IN ADDITION TO HEAVY RAINFALL. LOCATIONS IMPACTED INCLUDE... CHINO VALLEY...PAULDEN AND NORTH WILLIAMSON VALLEY. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 3468 11250 3479 11267 3501 11251 3484 11226 TIME...MOT...LOC 1924Z 220DEG 9KT 3480 11253
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 205 PM MST SUN AUG 9 2015 AZZ007-012-015-092130- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-COCONINO PLATEAU-WESTERN MOGOLLON RIM- 205 PM MST SUN AUG 9 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL COCONINO COUNTY UNTIL 230 PM MST... AT 204 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 18 MILES EAST OF VALLE...OR 30 MILES NORTH OF FLAGSTAFF...MOVING EAST AT 20 MPH. WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... MAINLY RURAL LOCATIONS NORTH OF THE SAN FRANCISCO PEAKS. THIS STORM HAS EXHIBITED ROTATION. AS SUCH...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 3550 11190 3568 11192 3575 11153 3548 11151 TIME...MOT...LOC 2104Z 265DEG 17KT 3560 11182
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 239 PM MST SUN AUG 9 2015 AZZ004-005-009-092215- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD- 239 PM MST SUN AUG 9 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL COCONINO COUNTY UNTIL 315 PM MST... AT 238 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES NORTHWEST OF BITTER SPRINGS...OR 21 MILES SOUTHWEST OF PAGE... MOVING EAST AT 20 MPH. NICKEL SIZE HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... LEES FERRY AND MARBLE CANYON. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 3662 11180 3675 11189 3692 11157 3670 11144 TIME...MOT...LOC 2138Z 251DEG 17KT 3672 11177 MOTTICE
The Cedar City radar (KICX), 150 km away, was scanning. The volume nearest the first event began at 00:00 UTC.
1 flash flood. Local standard time, as filed.
A maintenance worker at the Lake Powell Tribal Park reported significant flooding in Antelope Canyon. Time estimated using radar data.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2015Every state in 2015This day in weather historyWarnings in Arizona, August 2015
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: 599034.