A thunderstorm produced heavy rain and flash flooding near Perkinsville.
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The episode as NWS FGZ wrote it up.
A thunderstorm produced heavy rain and flash flooding near Perkinsville.
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 10, 9:17 AM MST, 5 hours 13 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 917 AM MST Tue Jul 10 2018 .SYNOPSIS...The monsoon weather pattern will persist over Arizona this week, with daily rounds of showers and thunderstorms. && .DISCUSSION...A moist monsoon air mass is entrenched across Arizona. Starting out today locations west of Interstate-17 and north of Interstate-40 are seeing mostly sunny skies. The highest moisture values run from Prescott and Flagstaff northward to the Kaibab Plateau. The intersection of sun and moisture suggests the most active areas will be from Prescott and Flagstaff northward to the kaibab plateau. The flow turns more southerly by this evening with a few storms possibly running northward across the Little Colorado River valley. The instability is not particularly strong today but the air mass is moist with localized downpours and flooding the most likely product of storms. If you are out hiking in rocky areas keep an eye to the sky and a ear out for thunder. An easterly wave (inverted trough of low pressure) can be seen on the water vapor satellite image this morning over the Arizona/New Mexico boarder near and south of the White Mountains. This has allowed light showers to continue in southern Apache and Navajo Counties this morning. These showers have been moving west- northwest. The inverted trough will provide lift today even though morning cloud cover may limit surface heating. The ongoing showers generally southeast of Winslow will continue and increase in intensity through the morning. Storm development will spread west and northwestward through the day. The greatest coverage today is expected to be from White Mountains northwestward to the Kaibab Plateau and Yavapai County with isolated coverage northeast of the Mogollon Rim. Main threats remain to be small hail, gusty winds, and heavy rainfall. Long range models keep moisture locked in over northern Arizona with a continuation of shower and thunderstorm activity . By Wednesday, the flow over northern Arizona shifts to become more southerly. This will open the door for more widespread activity and increased moisture across the area. This will likely shift our threats each day more toward a flash flooding concern. Scattered to numerous storms are expected each afternoon through the rest of the week. && .AVIATION...For the 18Z package...Sct-nmrs shra/tsra and isold +tsra 03Z. Highest coverage along and southwest of the Mogollon Rim. Storm motion switching to the northwest today. Local MVFR conditions expected near heavier storms with hail and sfc wind gusts to 45kts. VFR conditions are expected outside of any storm activity. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Scattered to numerous afternoon and evening showers and thunderstorms will continue through the week. Daytime relative humidity values from 25 to 45 percent, with overnight recovery from 80 to 100 percent. Generally light winds, except near storms or associated with outflows. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...McCollum/MAS AVIATION...TPS/Peterson FIRE WEATHER...Peterson For Northern Arizona weather information visit weather.gov/flagstaff
The Flagstaff radar (KFSX), 97 km away, was scanning. The volume nearest the first event began at 21:32 UTC.
1 flash flood. Local standard time, as filed.
The Yavapai Flood Control gauge at Perkinsville reported at least a 2.28 foot rise on the Verde River downstream from a thunderstorm that produced heavy rain.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2018Every state in 2018This day in weather historyWarnings in Arizona, July 2018
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: 765551.