Monsoon moisture remained over northern Arizona. A thunderstorm caused flash flooding in the Verde Valley.
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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.
Monsoon moisture remained over northern Arizona. A thunderstorm caused flash flooding in the Verde Valley.
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 26, 2:36 PM MST, 1 hour 43 minutes earlier.
Area Forecast Discussion National Weather Service Flagstaff AZ 236 PM MST Thu Jul 26 2018 .SYNOPSIS...Excessive heat will continue for the lower valleys of northern Arizona today. Otherwise, typical isolated to scattered thunderstorms will continue along the higher terrain of northern Arizona each afternoon. An increasing trend in thunderstorms is forecast over the weekend. && .DISCUSSION...High pressure remains centered over the lower Colorado River Valley today. Marginal moisture and instability have resulted in isolated to scattered showers and storms over the higher terrain of northern Arizona this afternoon. The main storm threats today are lightning and gusty outflow winds. Storms are moving to the south or southeast at about 10-15 mph. With the loss of daytime heating around sunset, expect shower activity to gradually dissipate. Excessive Heat Warnings and Advisories remain in effect this afternoon and we plan to allow these to expire this evening. The large scale high pressure ridge will make very little movement over the weekend. Increasing southerly low level flow is forecast to bring gradually increasing low level moisture northward across the area. This should lead to an uptick in thunderstorms over the weekend, and perhaps as early as Friday. With the ridge parked to our west, steering flow will keep a northerly storm motion over the weekend meaning areas along and south of the Mogollon Rim/White Mountains will be favored for storm activity. With increasing moisture, the threat for heavy rain will also increase. The increasing clouds and moisture should keep temperatures from reaching excessive levels, though they will remain on the warm side of normal through the weekend. The ridge remains over the southwest through next week keeping typical monsoon season conditions over the area. Expect daily rounds of showers and thunderstorms with temperatures trending above average. && .AVIATION...For the 00Z package...Isolated to scattered thunderstorms will persist through sunset before dissipating overnight. Brief MVFR/IFR conditions possible in isolated +RA. Winds generally light, except gusts to 45 kts in the vicinity of stronger storms. Scattered TSRA expected to re-develop around 18Z Friday. Aviation discussion not updated for amendments. && .FIRE WEATHER...Scattered showers and thunderstorms will continue over northern Arizona today, with storm motion generally from north to south into lower elevations. Temperatures and relative humidities will remain on the warm and dry side for this time of year. Storm coverage will increase slightly Friday into the weekend, with a slight downward trend in temperatures and upward trend in relative humidity. Sunday through Tuesday...Expect typical monsoon weather conditions into next week with scattered thunderstorms each day and near to slightly warmer than average temperatures. && .FGZ WATCHES/WARNINGS/ADVISORIES...Heat Advisory until 8 PM MST this evening FOR AZZ012-013. Excessive Heat Warning until 8 PM MST this evening FOR AZZ005-006. && PUBLIC...MCT AVIATION...MCT FIRE WEATHER...MCT For Northern Arizona weather information visit weather.gov/flagstaff
Special Weather Statement National Weather Service Flagstaff AZ 225 PM MST THU JUL 26 2018 AZZ015-037-038-262215- Yavapai County Valleys and Basins-Western Mogollon Rim-Oak Creek and Sycamore Canyons- 225 PM MST THU JUL 26 2018 ...SIGNIFICANT WEATHER ADVISORY FOR YAVAPAI AND COCONINO COUNTIES UNTIL 315 PM MST... At 225 PM MST, Doppler radar was tracking strong thunderstorms along a line extending from Junipine Resort to near Clarkdale. Movement was southeast at 10 mph. Half inch hail and wind gusts up to 50 mph will be possible with these storms. Locations impacted include... Sedona, Junipine Resort, Village At Oak Creek, Garland's Oak Creek Lodge, Page Springs, Cornville, Slide Rock State Park, Red Rock State Park and Manzanita Campground. LAT...LON 3485 11160 3469 11191 3496 11215 3507 11187 TIME...MOT...LOC 2125Z 324DEG 8KT 3497 11177 3483 11202 ET
Special Weather Statement
National Weather Service Flagstaff AZ
232 PM MST THU JUL 26 2018
AZZ018-262215-
Northern Gila County-
232 PM MST THU JUL 26 2018
...SIGNIFICANT WEATHER ADVISORY FOR THE STRAWBERRY AND PINE AREA OF
GILA COUNTY UNTIL 315 PM MST...
At 231 PM MST, Doppler radar was tracking a strong thunderstorm over
Geronimo Estates, or 9 miles north of Payson, moving southwest at 5
mph.
Winds in excess of 40 mph and locally heavy rainfall will be
possible with this storm.
Locations impacted include...
Geronimo Estates, Flowing Springs, Pine, Strawberry, East Verde
Estates, Whispering Pines, Geronimo Boy Scout Camp, Water Wheel Burn
At Houston Mesa Rd-
S, Beaver Valley and Water Wheel Burn At Houston Mesa Rd-N.
LAT...LON 3439 11153 3442 11148 3441 11146 3442 11146
3445 11143 3444 11140 3443 11141 3443 11143
3438 11142 3439 11139 3441 11141 3441 11140
3443 11140 3443 11137 3436 11125 3428 11138
TIME...MOT...LOC 2131Z 047DEG 5KT 3438 11139
ETThe Flagstaff radar (KFSX), 56 km away, was scanning. The volume nearest the first event began at 23:17 UTC.
1 flash flood. Local standard time, as filed.
Police reported flooding on Highway 260 at milepost 224.
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: 781559.