Thunderstorms produced heavy rain and flash flooding in Antelope Canyon south east of Page.
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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.
Thunderstorms produced heavy rain and flash flooding in Antelope Canyon south east of Page.
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 Jul 31, 9:25 PM MST, 19 hours 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 925 PM MST WED JUL 31 2013 .SYNOPSIS... SHOWERS AND ISOLATED THUNDERSTORMS MAY CONTINUE OVERNIGHT AS A DISTURBANCE APPROACHES FROM THE SOUTHEAST. DAYTIME THUNDERSTORM COVERAGE SHOULD INCREASE ON THURSDAY AND FRIDAY RELATIVE TO COVERAGE SEEN THIS AFTERNOON. && .DISCUSSION... WE UPDATED THE FORECAST GRIDS EARLIER THIS EVENING TO REFLECT GREATER PRECIP CHANCES IN SOUTHEAST PORTIONS OF THE COUNTY WARNING AREA AS A WEAK SHORT WAVE TROUGH MOVES TOWARD NORTHERN AZ FROM THE SOUTHEAST. IN ADDITION...AN MCV IS APPARENT IN SOUTHWEST NAVAJO COUNTY. WE RAISED OVERNIGHT MINIMUM TEMPERATURES IN ANTICIPATION OF THICK CLOUD COVER OVER MUCH OF THE AREA. && .PREVIOUS DISCUSSION /330 PM MST/... SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPED FROM NEAR DESERT VIEW AT THE GRAND CANYON...MOGOLLON RIM...TO THE WHITE MOUNTAINS TODAY. THE STORMS ARE MOVING NORTHWARD INTO THE LCR THIS AFTERNOON. THIS ACTIVITY IS EXPECTED TO CONTINUE INTO THIS EVENING. VISIBLE SATELLITE SHOWED SEVERAL UPPER DISTURBANCES OVER NORTHERN MEXICO THIS MORNING. THESE DISTURBANCES ARE MORNING NORTHWARD AND MAY WELL CONTINUE THUNDERSTORM ACTIVITY WELL INTO THE NIGHT OVER NORTHERN ARIZONA. THE 17Z RUN OF THE HRRR SHOWED RAIN SHOWERS RE-DEVELOPING OVER THE RIM COUNTRY LATE THIS EVENING. HAVE KEPT CHANCE POPS GOING THROUGH THE NIGHT FOR THE HIGHER TERRAIN OVER MUCH OF NORTHERN ARIZONA. HIGH PRESSURE WILL REMAIN EAST OF ARIZONA FOR THE NEXT WEEK. ARIZONA WILL BE ON THE WESTERN EDGE OF THE HIGH WITH A SOUTH TO SOUTHWEST FLOW OVER THE STATE. THE GFS AND EC ARE AT ODDS ON HOW MUCH MOISTURE WILL MOVE OVER THE STATE AND IF/WHEN SIGNIFICANT DRYING WILL HAPPEN. FORECAST LEANS MORE TOWARD THE EC GIVEN HOW IT HAS HANDLED THE WETTER PATTERN SO FAR THIS SUMMER. SHOWER AND THUNDERSTORM COVERAGE SHOULD INCREASE EACH DAY ACROSS THE AREA THROUGH FRIDAY AND THEN REMAIN FAIRLY CONSTANT THROUGH THE WEEKEND. && .AVIATION... FOR THE 06Z PACKAGE...MONSOON MOISTURE IS ON THE INCREASE. AT LEAST ISOLATED THUNDERSTORMS MAY CONTINUE THROUGH THE OVERNIGHT HOURS...WITH AREAS OF RAIN SHOWERS ESPECIALLY SOUTHEAST OF A KPAN/KFLG/KRQE LINE. MVFR VISIBILITY MAY OCCUR IN AREAS OF RAINFALL. THUNDERSTORMS WILL DEVELOP AGAIN ON THURSDAY AFTER 18Z WITH THE ATTENDANT THREATS OF LOWERED VISIBILITY AND GUSTY WINDS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FIRE WEATHER... MONSOON MOISTURE WILL PUSH BACK ACROSS NORTHERN ARIZONA WITH AN INCREASING CHANCE OF SHOWERS AND THUNDERSTORMS ON THURSDAY AND FRIDAY. SATURDAY THROUGH MONDAY...THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER NORTHERN ARIZONA. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........AT/MAS AVIATION.......AT FIRE WEATHER...MCCOLLUM FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 525 AM MST THU AUG 1 2013 AZZ004>018-037>040-020700- 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- 525 AM MST THU AUG 1 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY DEEP MONSOON MOISTURE HAS RETURNED TO NORTHERN ARIZONA. WEAK STEERING FLOW WILL RESULT IN SLOW MOVING THUNDERSTORMS CAPABLE OF PRODUCING VERY HEAVY RAINFALL. LOCALIZED FLOODING AND ENHANCED RUNOFF WILL BE POSSIBLE WITH ANY PERSISTENT STORMS...AS WELL AS HAIL AND DANGEROUS LIGHTNING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY FROM FRIDAY THROUGH WEDNESDAY...ANOTHER ACTIVE DAY IS EXPECTED FRIDAY WITH TYPICAL DAILY VARIATIONS IN THE DAILY THUNDERSTORM COVERAGE EXPECTED THEREAFTER. LOW TO MID GRADE MONSOON PATTERN LOOKS TO CONTINUE THROUGH MIDWEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Cedar City radar (KICX), 152 km away, was scanning. The volume nearest the first event began at 00:01 UTC.
1 flash flood. Local standard time, as filed.
Flash flooding was reported in Antelope Canyon southeast of Page. Eight to 12 inches of new sand was deposited in this popular slot canyon.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2013Every state in 2013This day in weather historyWarnings in Arizona, August 2013
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: 474425.