An extremely moist air mass remained over northern Arizona with a continuation of heavy rain and flash flooding.
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.
An extremely moist air mass remained over northern Arizona with a continuation of heavy rain and flash flooding.
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 30, 8:30 PM MST, 3 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 830 PM MST FRI JUL 30 2010 .SYNOPSIS...AN EXTREMELY MOIST SOUTHEASTERLY FLOW WILL BRING SHOWERS AND THUNDERSTORMS TO NORTHERN ARIZONA THROUGH THE WEEKEND. SOME STORMS WILL PRODUCE HEAVY RAINFALL. A FLASH FLOOD WATCH IS IN EFFECT FOR NORTHERN ARIZONA FROM FRIDAY EVENING UNTIL MIDNIGHT SUNDAY MORNING. && .DISCUSSION... GETTING TO THE POINT...THE FLASH FLOOD WATCH HAS BEEN EXTENDED IN TIME. IT NOW RUNS FROM FRIDAY EVENING UNTIL MIDNIGHT SUNDAY MORNING. THIS EVENING A LARGE AREA OF SHOWERS AND THUNDERSTORMS WERE CONTINUING ACROSS NAVAJO AND APACHE COUNTIES...MOVING SLOWLY WESTWARD. THESE STORMS ARE LINKED TO A CYCLONIC CIRCULATION SEEN IN THE WATER VAPOR LOOP OVER SOUTHEAST AZ EARLIER THIS AFTERNOON. WE HAVE ISSUED SEVERAL FLASH FLOOD WARNINGS AND SMALL STREAM FLOOD ADVISORIES TODAY. PROGS SHOW LITTLE CHANGE IN THE MOISTURE FIELDS THIS WEEKEND SO THE SCREAMING MESSAGE IS TO STAY OUT OF CANYONS. PREV DISCUSSION...330 PM. THUNDERSTORMS CONTAINING VERY HEAVY RAINFALL SCATTERED ACROSS NORTHERN AZ THIS AFTERNOON IN A VERY MOIST ATMOSPHERE CONTAINING AROUND 1.2 INCHES PRECIPITABLE WATER. A FLASH FLOOD WATCH HAS BEEN ISSUED AND REMAINS IN EFFECT UNTIL MIDNIGHT TONIGHT. THIS EVENING...THUNDERSTORMS LIKELY TO MOVE TOWARD LOW ELEVATIONS...EVENTUALLY WEAKENING OVERNIGHT. ON SATURDAY...LITTLE CHANGE IN THERMODYNAMIC PROFILE OF SOUNDING SO ANOTHER DAY OF HEAVY RAIN LIKELY. FIRST CHANCE FOR A SIGNIFICANT DRYING TREND LOOKS TO BE EARLY NEXT WORK WEEK AT THE EARLIEST. ALONG WITH MOIST CONDITIONS...SEVERAL DEGREES BELOW AVERAGE TEMPERATURES ARE EXPECTED DUE TO RAIN-COOLED ATMOSPHERE AND PERSISTENT CLOUD COVER. DJO && .AVIATION...FOR THE 06Z PACKAGE...SCT-NMRS SHRA/TSRA WILL CONTINUE INTO THE EARLY MORNING HOURS. HEAVY RAINFALL LIKELY WITH AREAS MVFR AND LOCAL IFR VIS/CIGS PSBL. THUNDERSTORMS WILL REDEVELOP ACROSS THE NORTHLAND ON SATURDAY....WITH HEAVY RAINFALL AND AREAS MVFR AND LOCAL IFR VIS/CIGS PSBL. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...FLASH FLOOD WATCH IN EFFECT FOR ALL NORTHERN ARIZONA FORECAST ZONES UNTIL MIDNIGHT SUNDAY MORNING. PUBLIC.......DL AVIATION.....DL VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1223 PM MST FRI JUL 30 2010 AZZ004>018-037>040-310700- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY- COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS- NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY- CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS- NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS- OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA- NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264- 1223 PM MST FRI JUL 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL ARIZONA...NORTH CENTRAL ARIZONA...NORTHEAST ARIZONA AND WEST CENTRAL ARIZONA. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS NORTHERN ARIZONA TODAY. STORMS ARE EXPECTED TO BECOME WIDESPREAD OVER NORTHERN ARIZONA IN THE AFTERNOON AND EVENING. THE MAIN THREATS WILL BE EXTREMELY HEAVY RAIN AND LOCALIZED FLOODING. IN ADDITION...FREQUENT CLOUD-TO-GROUND LIGHTNING WILL ACCOMPANY THUNDERSTORMS. A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR ALL NORTHERN ARIZONA FORECAST ZONES. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY HIGH PRESSURE EAST OF ARIZONA WILL CONTINUE TO BRING MOIST SOUTHEASTERLY FLOW OVER THE STATE. THE THREAT FOR SHOWERS AND THUNDERSTORMS ALONG WITH HEAVY RAIN WILL CONTINUE INTO EARLY NEXT WEEK WITH A POTENTIAL DRYING TREND BY MIDWEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1050 PM MST FRI JUL 30 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0715 PM FLASH FLOOD 15 N COTTONWOOD 34.95N 112.02W
07/30/2010 YAVAPAI AZ LAW ENFORCEMENT
YAVAPAI S.O. FLASH FLOODING ON SYCAMORE CANYON. 4
PEOPLE STRANDED NEAR SWIMMING HOLE. RESCUE UNDERWAY.
&&
EVENT NUMBER FGZ1000161
041The Flagstaff radar (KFSX), 116 km away, was scanning. The volume nearest the first event began at 06:58 UTC.
7 flash flood, 2 heavy rain. Local standard time, as filed.
Three and a half inches of rain fell overnight four mile south of Williams. Most of that (2.90 inches) fell from 500 AM to 700 AM.
Over one and half inches (1.60) of rain fall overnight. Most of that fell from 645 AM to 838 AM.
Heavy rain caused flash flooding in Cataract Creek. The water level went from a dry stream bed to 4 to 5 feet deep in just 15 minutes.
A mudslide slid across Highway 191 at milepost 416 near Nutrioso.
Heavy rain produced flooding in and around Concho. Two feet of water covered County Road 5020 at mile marker 15. Water flowed over Highway 61 at milepost 375 three miles east of Concho. Forest Service Roads became impassable.
Several roads were flooded in and around Taylor. Part of Airport Road washed out near Highway 77.
Heavy rain produced flooding in the Vernon area. County Road 3144 had water flowing over the top.
Water flowed over Highway 12 and stopped traffic north of Lupton near Oak Springs.
Flowing water from Wide Ruin Wash stopped traffic as it flowed over Highway 191.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2010Every state in 2010This day in weather historyWarnings in Arizona, July 2010
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: 254265, 254266, 254269, 254270, 254273, 254272, 254278, 254275, 254277.