A surge of moisture from the Gulf of California helped trigger severe thunderstorms across Yavapai County and southern Navajo 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.
A surge of moisture from the Gulf of California helped trigger severe thunderstorms across Yavapai County and southern Navajo 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 Jul 9, 1:46 PM MST, 2 hours 4 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 146 PM MST Fri Jul 9 2021 .SYNOPSIS...High pressure remains in control through the weekend, delivering hot daytime temperatures through Sunday. A slight increase in monsoonal moisture will take place over the weekend, however showers and storms are expected to remain isolated to the Mogollon Rim. More significant moisture looks to return next week, with greater chances for showers and thunderstorms. && .DISCUSSION...Scattered showers and thunderstorms have develop across the the Mogollon Rim, Chuska Mountains and Black Mesa this afternoon. Activity over the far northeast is expected to diminish within the next few hours. Latest HRRR guidance has activity over the Mogollon Rim increasing over the next couple of hours, with a line of thunderstorms moving off the Rim into this evening. Much of the activity should diminish around 8pm, with only a few light showers and storms remaining through 10pm over southern Yavapai and Gila counties. Primary threats will be strong gusty outflow winds and brief heavy rainfall, a few of the stronger storms also have the potential to produce some small hail. The strong ridge over the southwest will remain in place through the weekend, with heights maximize over northern Arizona on Saturday. As a result, hot temperatures are expected to continue over the area, with Saturday being the warmest day. Excessive Heat Warnings remain in effect for the lower elevations of Yavapai County as well as the Grand Canyon. Much of the showers and thunderstorm activity this weekend will be suppressed with the stable air mass in place, however slight chance for showers and storms will exist along the Mogollon Rim and higher terrain during the afternoon hours. For the start of next week, the ridge begins to degrade and wobble around the southwestern United States. Monsoonal moisture beings to surge northward into Arizona, bringing the chance for more widespread showers and thunderstorms for much of the upcoming week. Much of the EPS members, and to a lesser extent the GEFS members, are in agreement with an increase in moisture into northern Arizona. Cooler, more seasonable temperatures and light winds are also expected for next week. && .AVIATION...For the 00Z package...VFR conditions are expected to prevail for much of the period. Local MVFR conditions will be possible in showers and thunderstorms mainly along and south of a KGCN-KFLG-KSOW line. More isolated showers and storms will be possible after 20Z Saturday. Gusty and erratic winds will be possible in and around thunderstorms. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Isolated showers and thunderstorms are expected Saturday and Sunday, mainly along the Mogollon Rim and south. Primary hazards will be strong gusty outflow winds, brief heavy rainfall, and lightning. Temperatures are expected to remain hot along with light northwest/north winds. Monday through Wednesday...Shower and thunderstorms chances increase each afternoon areawide for the start of next week. Cooler more seasonable temperatures and light winds are also expected. && .FGZ WATCHES/WARNINGS/ADVISORIES... Excessive Heat Warning until 8 PM MST Saturday FOR AZZ037. Excessive Heat Warning until 8 PM MST Sunday FOR AZZ005-006. && PUBLIC...Humphreys AVIATION...Humphreys FIRE WEATHER...Humphreys For Northern Arizona weather information visit weather.gov/flagstaff
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
343 PM MST FRI JUL 9 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0338 PM HAIL 5 SW PRESCOTT VALLEY 34.56N 112.39W
07/09/2021 E0.50 INCH YAVAPAI AZ PUBLIC
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
346 PM MST FRI JUL 9 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0340 PM HAIL 1 NE PRESCOTT COURTHOUS 34.55N 112.46W
07/09/2021 E0.70 INCH YAVAPAI AZ PUBLIC
&&The Flagstaff radar (KFSX), 54 km away, was scanning. The volume nearest the first event began at 22:47 UTC.
2 thunderstorm wind, 2 hail, 1 flash flood. Local standard time, as filed.
Pictures on Social Media show a roof that was blown off, patio furniture blown off, an AC unit blown ripped off a roof, and broken tree limbs.
Report on Social Medea indicate that a thunderstorm produced 1 3/4 inch diameter (golf ball sized) hail that caused loss of livestock, loss of chickens, loss of gardens, broken windows, and roof damage.
Two USGS river gauges on Granite Creek measured a 4 foot rise due to heavy rain fall in the area.
Reports and videos of wind damage to trees and structures in Bagdad were posted on Social Media.
One inch diameter hail fell one mile northwest of Heber-Overgaard.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2021Every state in 2021This day in weather historyWarnings in Arizona, July 2021
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: 976754, 976756, 976744, 976886, 976777.