Heavy rain from thunderstorms caused minor flooding in Sedona and rock slides in Oak Creek Canyon.
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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.
Heavy rain from thunderstorms caused minor flooding in Sedona and rock slides in Oak Creek Canyon.
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 Sep 4, 9:00 AM MST, 4 hours 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST TUE SEP 4 2012 .SYNOPSIS... MONSOON MOISTURE WILL BRING SCATTERED SHOWERS AND THUNDERSTORMS EACH AFTERNOON AND EVENING FOR SEVERAL DAYS. TEMPERATURES WILL REMAIN NEAR NORMAL. && .DISCUSSION... FORECAST MODELS SHOW THAT THE MID-LEVEL CIRCULATION CENTER ASSOCIATED WITH HIGH PRESSURE WILL REMAIN OVER CENTRAL ARIZONA TODAY...AND THEN MOVE SLOWLY TO SOUTHEAST NEW MEXICO BY THE WEEKEND. THIS WILL KEEP THE MONSOONAL AIR MASS OVER NORTHERN ARIZONA. THUS THE PATTERN OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL PERSIST THROUGH EARLY NEXT WEEK. MODELS ARE NOT AS BULLISH WITH THE DRYING LATE THIS WEEK IN THE FAR NORTH. IN ADDITION...THE MODELS ARE HINTING AT A MOISTURE INCREASE INTO AREAS ALONG AND SOUTH OF THE MOGOLLON RIM THIS WEEKEND. NEAR NORMALS TEMPERATURES ARE EXPECT FOR THE NEXT 7 DAYS. && .AVIATION... FOR THE 18Z PACKAGE...EXPECT ANOTHER ROUND OF SCT TSRA THIS AFTERNOON...DEVELOPING FIRST OVER THE HIGHER TERRAIN AND THEN DRIFTING INTO THE LOWER ELEVATIONS. STORM MOTION WILL BE SLOWLY TO THE EAST. THE STRONGER CELLS WILL CONTAIN BRIEF IFR VSBY IN HEAVY RAIN...WITH GUSTY WINDS AND SMALL HAIL ALSO POSSIBLE. STORMS WEAKENING BTWN 01Z-03Z AND BECOMING ISOLD OVERNIGHT FROM THE MOGOLLON RIM SOUTHWARD. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........MCCOLLUM/DL AVIATION.......JJ/TC FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 238 AM MST TUE SEP 4 2012 AZZ004>018-037>040-050530- 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- 238 AM MST TUE SEP 4 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NAVAJO...YAVAPAI...AND NORTHERN GILA COUNTIES. .DAY ONE...TODAY SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED. STORM MOTION WILL GENERALLY BE FROM WEST TO EAST. STORMS THREATS TODAY ARE LIGHTNING...LOCALLY HEAVY RAIN...SMALL HAIL AND WIND GUSTS TO 45 MPH. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED THROUGH MONDAY. STORM COVERAGE MAY INCREASE ALONG AND SOUTH OF THE MOGOLLON RIM THIS WEEKEND. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The national radar mosaic for the moment the first event began.
2 heavy rain. Local standard time, as filed.
Very heavy rain fell along Oak Creek Canyon. Debris fell onto the road at the upper end of the canyon.
Water was flowing across Highway 89A in West Sedona. Sunset Drive and Shelby Drive were close to do water on the roadway. Between 1.00 and 1.50 inches of rain was recorded in Sedona.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2012Every state in 2012This day in weather historyWarnings in Arizona, September 2012
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: 413031, 413025.