Organized convection developed across northern Arizona with heavy rain and rotation in some storms.
Every event with a place to put it. Tap one for its entry below.
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.
Organized convection developed across northern Arizona with heavy rain and rotation in some storms.
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 18, 10:14 AM MST, 1 hour earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 1014 AM MST Sun Jul 18 2021 .SYNOPSIS...Expect scattered to numerous afternoon and evening showers and thunderstorms for the foreseeable future. Localized flash flooding will be possible with the stronger storms. Temperatures are also expected to remain around normal to slightly below normal. && .UPDATE...A few thunderstorms are currently developing over the White Mountains and northwest of Heber-Overgaard this morning. Scattered thunderstorm activity should continue to develop throughout the day, with storm motion primarily from east to west. Hi-res model guidance indicates an area of better organized convection developing near Payson around 7pm this evening, then moving west towards I-17 between Flagstaff and Black Canyon City between 7-10pm. Attempted to capture this possibility in the grids with the morning update. Otherwise, the remaining forecast is on track. The updated products have been sent. && .PREV DISCUSSION /255 AM MST/...A few showers mainly north of I-40 will continue to diminish through 5 am. Showers and thunderstorms are expected to develop once again late this morning and early afternoon, initiating mainly over the high terrain. Expect the activity continue into the afternoon, moving into the lower elevations as the day progresses. Much of the activity should come to an end by the evening, however a few lingering showers will be possible especially over Yavapai and Gila counties. Heavy rainfall will continue to be a threat from these storms, so areas of localized flash flooding will remain a possibility. High pressures is expected to remain in place over the Four Corners region through the forecast period, keeping monsoonal moisture in place over much of northern Arizona. As a result, daily afternoon showers and thunderstorms are expected for the foreseeable future. Later into next week, a slight increase in moisture as the high wobbles around may lead to an increase in shower and thunderstorm coverage. Nevertheless, localized flash flooding will be possible each day with areas of heavy rainfall. Temperatures through the period remain around normal through the first part of next week, then cooling a few degrees each day. Background winds will also remain light through the period. && .AVIATION...For the 18Z package...Expect mainly VFR conditions through the TAF period. Scattered to numerous showers and thunderstorms are forecast from 18Z-03Z. MVFR conditions possible in stronger storms. Sfc winds outside of storms generally light. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Showers and thunderstorms are expected for each afternoon Sunday through Thursday. Coverage will be scattered to numerous, with locally heavy rainfall amounts. Expect light winds and near normal high temperatures outside of storms. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...TM/Humphreys AVIATION...TM FIRE WEATHER...Peterson For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 18 km away, was scanning. The volume nearest the first event began at 18:14 UTC.
4 flash flood, 3 heavy rain, 2 funnel cloud. Local standard time, as filed.
A thunderstorm produce 1.20 inches of rain in just over an hour about 12 miles east-northeast of Clints Well (at the rat of an inch per hour).
A former NWS employee reported a funnel cloud southeast of Valle.
People in Greer took pictures and video of a funnel cloud to the southeast moving west.
The river gauge on Granite Creek near Watson Lake rose 5 feet in a flash flood due to heavy rain from a thunderstorm.
A thunderstorm produce 2.55 inches of rain near Hart Prairie.
A thunderstorm produced between 2.55 and 2.71 inches of rain near Hart Prairie.
A 10-12 inch rise was reported on Hess Creek in Heber-Overgaard. The creek came out of its banks putting debris on the roadway and threatening one home. This prompted using sand bags to protect the home.
Cataract Creek at Redlands Crossing rose two feet in less than an hour due to heavy rainfall upstream.
Law enforcement reported flooding along State Route 87 and Indian Route 60 in Dilkon.
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: 978694, 978687, 978690, 978686, 978695, 978702, 978696, 978775, 978705.