Deep monsoonal moisture continued to move northward over Arizona thunderstorms and heavy rain.
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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.
Deep monsoonal moisture continued to move northward over Arizona thunderstorms and heavy rain.
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 3, 4:30 PM MST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 430 PM MST WED AUG 03 2016 .SYNOPSIS...Expect frequent and widespread storm activity through Thursday. Deep moisture will mean that stronger storms will contain torrential rainfall. A slow drying trend begins Friday, lasting through the weekend and into next week. && .DISCUSSION...By the end of this afternoon and early evening, most areas will have convected at least once today. Very large westward moving outflows and a a large, slow-moving upper low over the state will keep much of our deep moisture pool intact through tomorrow. In fact, the mid-levels begin to dry out a little bit on Thursday and Friday, with some added shear. This may be a recipe for stronger and more organized storms, capable of producing very high rainfall totals. We extended the Flash Flood Watch as a result of this, now extended through 6PM MST on Thursday. Drier southwest flow becomes persistent by Friday and into the weekend, perhaps even into the early part of next week. Eventually the moisture will be scoured out, from west to east, over a period of days. This will result in steadily decreasing pops and warming temperatures from Friday through day seven. && .AVIATION...For the 00Z package...SCT SHRA/TSRA will continue through 02Z with ISOLD MVFR/IFR conditions. Storms will decrease after 02Z with only ISOLD storms. Frequent storms are expected to develop again after 16Z Thursday. Aviation discussion not updated for TAF amendments. && .FGZ WATCHES/WARNINGS/ADVISORIES...Flash Flood Watch through 6PM MST Thursday for all of Apache, Coconino, Northern Gila, Navajo and Yavapai Counties. && PUBLIC...Peterson AVIATION...MAS For Northern Arizona weather information visit weather.gov/flagstaff
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1007 AM MST WED AUG 3 2016 AZZ004>018-037>040-040130- 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- 1007 AM MST WED AUG 3 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY AND TONIGHT DEEP MONSOON MOISTURE WILL LEAD TO FREQUENT AND WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY TODAY. A FLASH FLOOD WATCH IS NOW IN EFFECT FOR ALL OF APACHE, COCONINO, NORTHERN GILA, NAVAJO AND YAVAPAI COUNTIES. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY FREQUENT SHOWER AND THUNDERSTORM ACTIVITY IS FORECAST THROUGH FRIDAY. EXPECT A DRYING TREND OVER THE COMING WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Flagstaff radar (KFSX), 77 km away, was scanning. The volume nearest the first event began at 00:01 UTC.
2 flash flood, 1 heavy rain. Local standard time, as filed.
Heavy rain caused street flooding in Flagstaff. Some homes and businesses had water up to the door steps. Flooding occurred near the major intersection of Milton and Butler/Route 66 , West Dupont Avenue, and Blackbird Roost Street.
Heavy rain in Utah caused the Paria River to flash flood as it flowed south into Arizona and into the Colorado River. The Paria River was estimated to rise more than 2 feet at the Utah Arizona border in around 15 minutes.
A debris flow was reported across Highway 191 at mile marker 289 to 390. The road was temporarily close. Radar estimated an inch of rain in less than 60 minutes.
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, August 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: 658372, 658415, 658373.