Lightning from a thunderstorm injured guardsmen on the Camp Navajo Army Depot.
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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.
Lightning from a thunderstorm injured guardsmen on the Camp Navajo Army Depot.
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 13, 3:24 PM MST, 1 hour 34 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 324 PM MST Thu Jul 13 2017 .SYNOPSIS...Daily afternoon thunderstorms chances will continue through the middle part of next week. Scattered thunderstorm coverage is forecast through the end of this week, primarily along the Mogollon Rim, with an uptick in afternoon thunderstorm coverage expected Sunday through mid-week. Temperatures will be near normal through the weekend, then become a few degrees below normal next week. && .DISCUSSION...High pressure over northern Arizona will keep deep moisture confined to the central and southern Arizona valleys through Saturday. As a result, only scattered afternoon thunderstorm coverage is forecast across the Mogollon Rim through the end of the week. The main hazards should be lightning and localized flooding. The aforementioned high pressure is progged to weaken and shift east Sunday. Deeper moisture should subsequently creep into areas along and south of I-40 Sunday as a result. This should lead to an increase in thunderstorm coverage with localized flooding being the primary threat. High pressure is progged to continue to weaken and shift east through mid-week. This will open Arizona up to an unabated tropical moisture tap through mid-week. Increased POPS Monday-Thursday as a result. However, deep moisture could cloud over northern Arizona Monday-Tuesday minimizing the heavy rain/flooding threat. The medium range models indicate some drier air aloft beginning to work its way into the region Wednesday-Thursday. If this solution comes to fruition, then Wednesday-Thursday may be the highest risk days for flash flooding. However, it's too early to call at this time. Stay tuned! && .AVIATION...For the 00Z package...Scattered TSRA will continue through about 02Z before decreasing. These storms will generate brief MVFR conditions. A few isolated strong thunderstorms could produce hail and gusty outflow winds in excess of 35 knots. Otherwise VFR conditions are expected. Similar conditions can be anticipated for Friday. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Typical monsoon conditions will continue through Saturday with scattered afternoon and evening thunderstorms. Some isolated areas of heavy rain are possible, with otherwise light to moderate rainfall amounts. Expect seasonable temperatures to continue. Sunday through Tuesday...Increased moisture is forecast to spread north across the state leading to increased shower and storm activity. The potential for heavy rain will also increase, especially along and south of the Mogollon Rim. Look for increasing humidity values and slightly cooler temperatures. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...TM AVIATION...MCT FIRE WEATHER...MCT For Northern Arizona weather information visit weather.gov/flagstaff
Hazardous Weather Outlook National Weather Service Flagstaff AZ 330 PM MST Thu Jul 13 2017 AZZ004>018-037>040-141200- 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- 330 PM MST Thu Jul 13 2017 This hazardous weather outlook is for Apache...Coconino... Northern Gila...Navajo...and Yavapai Counties in Northern Arizona. .DAY ONE...This Afternoon and Tonight Scattered thunderstorms will continue along and south of the Mogollon Rim and the higher terrain of Yavapai county this afternoon and early evening. The main hazards will be localized flooding and lightning. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Most thunderstorm activity will be along and south of the Mogollon Rim through Saturday. The main hazards will be localized flooding and lightning. For Sunday through mid-week, deeper moisture moving northward from Mexico will bring increasingly active conditions back the region. Early indications are that Wednesday-Thursday may be the highest risk days for flash flooding. However, it's too early to call at this time. Stay tuned! .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures. TM
Special Weather Statement
National Weather Service Flagstaff AZ
435 PM MST THU JUL 13 2017
AZZ018-140015-
Northern Gila County-
435 PM MST THU JUL 13 2017
...SIGNIFICANT WEATHER ADVISORY FOR GILA COUNTY UNTIL 515 PM MST...
At 434 PM MST, Doppler radar was tracking a strong thunderstorm near
Tonto Basin, or 13 miles east of Sunflower. this storm was nearly
stationary.
Dime size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Reynolds Creek Group Campground and Rose Creek Campground.
LAT...LON 3376 11098 3380 11116 3390 11126 3391 11129
3399 11123 3389 11084 3373 11096
TIME...MOT...LOC 2334Z 301DEG 4KT 3389 11123
SukThe Flagstaff radar (KFSX), 91 km away, was scanning. The volume nearest the first event began at 23:57 UTC.
1 lightning. Local standard time, as filed.
Lightning struck and injured seven military personnel while they were working on a grounded helicopter on Camp Navajo Army Depot. All seven were treated and released.
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, July 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: 715758.