Increasing monsoon moisture brought thunderstorms with heavy rain over Yavapai County.
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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.
Increasing monsoon moisture brought thunderstorms with heavy rain over Yavapai County.
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 Sep 1, 8:56 AM MST, 3 hours 49 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 856 AM MST THU SEP 1 2016 .SYNOPSIS...Monsoon moisture will increase across Arizona today and Friday bringing scattered showers and thunderstorms across the Northland. A drying trend will start Saturday as a Pacific trough brings southwesterly flow into northern Arizona. && .UPDATE... The short term forecast is in good shape with no updates planned. && .PREV DISCUSSION /334 AM MST/... Moisture is expected to increase today and Friday across all of northern Arizona. An increase in overall thunderstorm coverage with the potential for stronger storms is anticipated each day. Enough dynamics are in place that storms lingering well into the evening and overnight hours are possible. A Pacific trough looks to move inland and across the Mountain West this coming weekend, with a resulting dry southwesterly flow aloft. Precipitation chances are forecast to drop significantly, and this should continue into the early stages of next week. In addition, breezy southwest winds will develop most afternoons during the 3 to 7 day forecast, with the gustier days likely to be Sunday and Monday. Daytime temperatures will be near to slightly below normal through the period. && .AVIATION...For the 18Z package...Expect scattered to numerous showers and thunderstorms across northern Arizona today. Scattered MVFR/IFR conditions are forecast near thunderstorms. Storm activity will continue through the overnight hours with isolated to scattered coverage. Aviation discussion not updated for TAF amendments. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...DL/KD AVIATION...Bohlin For Northern Arizona weather information visit weather.gov/flagstaff
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 408 AM MST THU SEP 1 2016 AZZ004>018-037>040-020500- 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- 408 AM MST THU SEP 1 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TONIGHT INCREASING MOISTURE WILL LEAD TO BETTER CHANCES FOR THUNDERSTORMS ACROSS THE AREA TODAY. THE PRIMARY HAZARDS WILL BE CLOUD-TO-GROUND LIGHTNING AND LOCALIZED FLASH FLOODING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY GOOD CHANCES FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE ON FRIDAY. CLOUD-TO-GROUND LIGHTNING AND LOCALIZED FLASH FLOODING WILL AGAIN BE THE PRIMARY THREATS. A DRYING TREND IS FORECAST FOR THE WEEKEND THROUGH MONDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS TO THE NWS FLAGSTAFF OFFICE AT 1-888-745-1637. KD
The Flagstaff radar (KFSX), 116 km away, was scanning. The volume nearest the first event began at 19:43 UTC.
1 flash flood, 1 heavy rain. Local standard time, as filed.
Granite Creek rose 3.5 feet near Prescott with a peak flow of 1468 CFS. An upstream gauge rose 4 feet with a peak flow of 1209 CFS.
Thunderstorms produced 1.42 inches of rain over about 2 hours. Minor street flooding and flowing washes were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2016Every state in 2016This day in weather historyWarnings in Arizona, September 2016
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: 659819, 659820.