A thunderstorm produced heavy rain and flooding in and around Polacca.
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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.
A thunderstorm produced heavy rain and flooding in and around Polacca.
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, 2:30 PM MST, 4 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST MON JUL 26 2010 .SYNOPSIS...HIGH PRESSURE WILL STRENGTHEN EAST OF ARIZONA THIS WEEK. EASTERLY FLOW AROUND THE HIGH WILL BRING ADDITIONAL MOISTURE AND AN INCREASING CHANCES OF SHOWERS AND THUNDERSTORMS ACROSS NORTHERN ARIZONA. && .DISCUSSION...SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS NORTHERN ARIZONA INTO THE EVENING HOURS. STORM MOTION IS EXPECTED TO BE FAIRLY SLOW...WITH THE MAIN THREAT FROM THESE SHOWERS AND THUNDERSTORMS BEING VERY HEAVY RAIN AND FREQUENT LIGHTNING. TUESDAY AND WEDNESDAY...HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE 4-CORNERS REGION STRENGTHENING THE MOIST SOUTHEASTERLY FLOW OVER CENTRAL AND NORTHERN ARIZONA. THIS WILL BRING DEEPER MOISTURE WESTWARD BY TUESDAY...WHICH WILL LEAD TO A CONTINUATION OF OUR SCATTERED TO NUMEROUS AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. HOWEVER STORM COVERAGE WILL DECREASE COMPARED TO TODAY...DUE TO RELATIVELY WARM TEMPERATURES ALOFT...WHICH WILL LIMIT INSTABILITY ON THESE DAYS. ANY STORMS THAT DEVELOP WILL INITIATE OVER THE HIGHER TERRAIN OF CENTRAL AND EASTERN AZ BEFORE MOVING INTO THE LOWER ELEVATIONS. LOCALLY HEAVY RAIN AND SMALL HAIL WILL BE THE MAIN THREATS. FOR THURSDAY THROUGH THE WEEKEND...EVEN DEEPER MOISTURE IS FORECAST TO MOVE INTO THE REGION AS THE SOUTHEASTERLY FLOW CONTINUES. IN ADDITION...A MID AND UPPER LEVEL TROUGH APPROACHING FROM THE SOUTHEAST MAY ALSO PROVIDE A FOCUS FOR CONVECTION DURING THIS PERIOD. THE COMBINATION OF HIGHER INSTABILITY DUE TO COOLING ALOFT...AND WELL ABOVE AVERAGE PRECIPITABLE WATER COULD BRING STRONGER STORMS WITH HEAVY RAINFALL...AND THE THREAT OF LOCALIZED FLASH FLOODING. && .AVIATION...FOR THE 00Z PACKAGE...SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE INTO THE EVENING HOURS....MOST NUMEROUS WEST OF A KPAN-KFLG-KGCN LINE. STRONGER STORMS WILL CONTAIN EXTREMELY HEAVY RAIN. OVERNIGHT AND INTO TUESDAY MORNING...A SLIGHT CHANCE OF SHOWERS AND STORMS WILL CONTINUE WITH GENERAL SCATTERED TO BROKEN SKY CONDITIONS OF 5-10 KFT AGL. EXPECT ANOTHER ROUND OF SHOWERS AND STORMS TUESDAY AFTERNOON. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. PUBLIC.......CLARK AVIATION.....MCCOLLUM VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 929 AM MST MON JUL 26 2010 AZZ004>018-037>040-270700- 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- 929 AM MST MON JUL 26 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 SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS NORTHERN ARIZONA TODAY. THE STORMS ARE EXPECTED TO MOVE OFF THE MOGOLLON RIM INTO YAVAPAI AND GILA COUNTIES. THE MAIN THREATS WILL BE HEAVY RAIN AND LOCALIZED FLOODING. FREQUENT CLOUD TO GROUND LIGHTNING WILL ALSO ACCOMPANY THUNDERSTORMS. A FEW OF THE STRONGER STORMS MAY ALSO PRODUCE HAIL AND STRONG WIND GUSTS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY HIGH PRESSURE WILL MOVE EAST OF ARIZONA THIS WEEK AND WILL INCREASE THE MOIST SOUTHEASTERLY FLOW OVER THE STATE. SHOWERS AND THUNDERSTORMS WILL ALSO INCREASE IN COVERAGE THIS WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
623 PM MST MON JUL 26 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1214 PM HEAVY RAIN E FLAGSTAFF 35.19N 111.62W
07/26/2010 E1.00 INCH Coconino AZ SPOTTER
0200 PM HEAVY RAIN 3 SSW FLAGSTAFF 35.15N 111.64W
07/26/2010 M2.20 INCH COCONINO AZ NWS EMPLOYEE
0230 PM HEAVY RAIN 4 S FLAGSTAFF 35.14N 111.62W
07/26/2010 M1.52 INCH COCONINO AZ ASOS
FLAGSTAFF AIRPORT ASOS
&&
EVENT NUMBER FGZ1000140 FGZ1000141 FGZ1000142
TCThe Flagstaff radar (KFSX), 158 km away, was scanning. The volume nearest the first event began at 02:01 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain from a thunderstorm produced flash flooding in the community of Polacca and Highway 264 between milepost 390 and 393.
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: 253863.