Moisture began to increase over northern Arizona isolated thunderstorms.
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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.
Moisture began to increase over northern Arizona isolated thunderstorms.
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 19, 3:06 PM MST, 3 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 306 PM MST FRI AUG 19 2016 .SYNOPSIS...Thunderstorm chances will remain in the forecast each afternoon through the first half of next week, primarily over the higher terrain. A drying trend could commence by Wednesday of next week. Temperatures will generally be near normal through the period. && .DISCUSSION...Ongoing afternoon convection will generally remain well below severe limits through the evening hours due to limited instability. Thunderstorm activity will wane with the loss of daytime heating. The latest models prog not much change in the upper pattern through Monday. Lingering moisture and instability should allow for afternoon thunderstorms to develop along the higher terrain of northern Arizona. Afternoon thunderstorms should diminish during the evening hours. The medium range models prog an upper trough to pivot across northern Arizona Tuesday. This will maintain thunderstorm chances across the area. However, synoptic subsidence in the wake of the trough could lead to a drying trend Wednesday through Friday. For now continued to forecast chance POPS Wed-Fri. Would like to see better model to model and run to run consistency before removing POPS from said period. && .AVIATION...For the 00z package...Mainly VFR conditions are forecast over northern Arizona through the TAF period. TEMPO MVFR conditions near thunderstorms are possible. Scattered thunderstorms should taper off by 02z Saturday, then redevelop again after 18z Saturday. Aviation discussion not updated for TAF amendments. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC/AVIATION...TM For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 143 km away, was scanning. The volume nearest the first event began at 01:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
A photo of a broken 4 inch diameter tree branch was at the Cameron Trading post was posted on-line. Storm lasted from 530 PM to 7 PM.
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: 659121.