Thunderstorms brought heavy rain to parts of Arizona on July 23.
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.
Thunderstorms brought heavy rain to parts of Arizona on July 23.
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 23, 9:48 AM MST, 1 hour 42 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 948 AM MST Thu Jul 23 2020 .SYNOPSIS...Widespread storm coverage is expected today through Saturday as a favorable monsoon pattern takes hold. More typical monsoon storm coverage is expected Sunday through the middle of next week. && .UPDATE...Increased southerly flow is observed this morning, in response to an unusually strong low pressure system over central California and high pressure to our east. This flow pattern has resulted in a significant increase in lower level atmospheric moisture over the past 24 hours (5 AM Bellemont Sounding Precipitable Water up to 0.83", Phoenix near 1.80"). At 945 AM, most of northern Arizona was seeing partly cloudy skies, certainly not enough cloud cover to hamper daytime heating. With this increased moisture, higher instability will exist today than previous days, and a few stronger storms are possible. Storm motion should be toward the north-northeast at 10-15 mph, with some training cells possibly resulting in locally heavy rain amounts and flooding. This threat covers all of northern Arizona, but especially areas south of I-40. Made some minor forecast updates this morning, to increase rain chances in the Winslow, Holbrook, St Johns areas as the southerly flow should push storms off the rim into these areas this afternoon. Otherwise, current forecasts are in good shape. && .PREV DISCUSSION /450 AM MST/... An increase in lower-level moisture combined with some enhanced dynamics will result in greater shower and thunderstorm coverage today and into the weekend. In fact, isolated thunderstorms have been continuing through the night already. Models are consistent in keeping moisture entrenched across the area through early next week with active monsoon weather expected daily. && .AVIATION...For the 18Z package...Shower and thunderstorm activity will become more widespread through the afternoon and early evening hours. The stronger storms will be capable of producing MVFR and localized IFR conditions. While the intensity of storms will likely decrease after sunset, expect areas of precipitation to continue into the overnight hours. Aviation discussion not updated for amendments. && .FIRE WEATHER...Expect widespread showers and thunderstorms today and Friday. Many locations will see wetting rainfall through this forecast period. Winds will be light and low haines indices. Saturday through Monday...An active monsoon pattern will bring scattered showers and thunderstorms each day, with near normal temperatures. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...JJ/KD AVIATION...TPS FIRE WEATHER...TPS For Northern Arizona weather information visit weather.gov/flagstaff
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</html>The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
There were several reports of between 1.00 and 2.20 inches of rain that fell in just over an hour in the Vernon area. Hail (0.70 inch diameter) was also reported.
A trained spotter reported 0.82 inches of rainfall in 25 minutes in Forest Lakes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2020Every state in 2020This day in weather historyWarnings in Arizona, July 2020
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: 899708, 899709.