Enough moisture remained over northern Arizona to produce heavy rain along the Utah border near the town 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.
Enough moisture remained over northern Arizona to produce heavy rain along the Utah border near the town 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 Aug 2, 3:34 PM MST, 36 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 334 PM MST Wed Aug 2 2017 .SYNOPSIS...Active monsoon conditions will continue across northern Arizona through Friday. A decrease in the monsoon moisture will thunderstorm activity by this weekend and into early next week. && .DISCUSSION...Scattered showers and thunderstorms have developed this afternoon in northern Arizona with the strongest storms observed over western Coconino and northern Yavapai counties. So far, activity has been less widespread than we have seen over the past few days. Coverage and intensity of these storms is expected to diminish after sunset with the loss of daytime heating. The main story through the forecast period will be the intrusion of drier air into the area. Ensembles indicate precipitable water values this weekend and into early next week will be as low as two standard deviations below normal. This is the result of a trough of low pressure off the coast of California which will increase west-southwest flow over the region advecting in the drier air. Due to this, expect significantly less shower and thunderstorm activity by the weekend and into early next week. However, isolated showers and thunderstorms still cannot be ruled out during this timeframe. As we look into the middle of next week and beyond, long range model guidance does indicate a change in the flow and another northward surge of monsoonal moisture leading to increased shower and thunderstorm activity. && .AVIATION...For the 00Z package...Showers and thunderstorms will continue into the evening and overnight hours, expected to be most numerous west of a KPGA-KFLG line. MVFR to IFR conditions in the stronger storms...otherwise VFR conditions expected. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Expect scattered showers and thunderstorms each day Thursday and Friday with areas of moderate to locally heavy rain. Gusty winds will develop near any storms. Saturday through Monday...Daily chances for showers and thunderstorms are anticipated to decrease across northern Arizona. Near normal temperatures are expected. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...TPS AVIATION...KD FIRE WEATHER...KD For Northern Arizona weather information visit weather.gov/flagstaff
Hazardous Weather Outlook National Weather Service Flagstaff AZ 344 AM MST Wed Aug 2 2017 AZZ004>018-037>040-030430- 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- 344 AM MST Wed Aug 2 2017 This hazardous weather outlook is for Apache...Coconino... Northern Gila...Navajo...and Yavapai Counties in Northern Arizona. .DAY ONE...Today and Tonight High pressure building over Nevada will bring east to northeast flow back to the area today. This will cause storm activity to decrease north of I-40, while the southern portions of the area stay active. The most likely initial development will be over the White Mountains and Mogollon Rim later this morning, with storm motion to the west. This will bring activity into Yavapai, northern Gila and western Coconino counties by the late afternoon. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The high pressure area begins to break down Thursday, allowing activity to push back northward. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
The Cedar City radar (KICX), 164 km away, was scanning. The volume nearest the first event began at 23:11 UTC.
1 flash flood. Local standard time, as filed.
A thunderstorm with heavy rain produced flowing water in Lower Antelope Canyon. Tours were cancelled for the day.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2017Every state in 2017This day in weather historyWarnings in Arizona, August 2017
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: 719348.