A thunderstorm produced damaging hail and heavy rain northwest of Flagstaff in Doney Park.
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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 damaging hail and heavy rain northwest of Flagstaff in Doney Park.
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 3, 9:30 AM MST, 3 hours 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST MON SEP 3 2012 .SYNOPSIS...SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED EACH AFTERNOON AND EVENING THROUGH WEDNESDAY. A DRYING TREND SHOULD BEGIN THURSDAY IN FAR NORTHERN ARIZONA. TEMPERATURES WILL REMAIN NEAR SEASONAL VALUES THIS WEEK. && .DISCUSSION... WATER VAPOR LOOP THIS MORNING SHOWS LITTLE CHANGE IN THE ORIENTATION OF THE MONSOON MOISTURE PLUME ACROSS ARIZONA. HOWEVER PRECIPITABLE WATER VALUES ARE LOWER THAN 24 HOURS AGO ACROSS NORTHERN ARIZONA. THE STORM STEERING FLOW IS EXPECTED TO SLOW THROUGH THE DAY GENERALLY PUSHING STORMS TO THE EAST TO NORTHEAST. THE BOTTOM LINE IS ANOTHER ROUND OF SCATTERED SHOWERS AND THUNDERSTORMS...STARTING OVER THE HIGHER TERRAIN BY LATE MORNING. TUESDAY AND WEDNESDAY...MOISTURE AND INSTABILITY WILL REMAIN OVER NORTHERN ARIZONA...WITH SCATTERED AFTERNOON AND EVENING THUNDERSTORMS EXPECTED BOTH DAYS. THURSDAY AND FRIDAY...THURSDAY SHOULD BE A TRANSITION DAY AS WESTERLY FLOW ALOFT RETURNS TO FAR NORTHERN ARIZONA. PRECIPITATION CHANCES WERE LOWERED TO CLIMATOLOGICAL VALUES THURSDAY. ON FRIDAY...MODEL STREAMLINES SHOW RIDGING FROM SAN DIEGO NORTHWARD TO BOISE...AND PUSH A DRY AND STABLE AIR MASS SOUTHWARD TO THE MOGOLLON RIM. WITH THIS IN MIND WE HAVE A DRY FORECAST FRIDAY FOR AREAS NORTH OF I-40 AND A SLIGHT CHANCE OF STORMS ELSEWHERE. MODEL FORECASTS SHOW A RETURN TO MOIST SOUTH-SOUTHWEST FLOW ALOFT FOR THE WEEKEND WITH A GOOD MOISTURE RETURN INTO SOUTHERN AND CENTRAL ARIZONA. WENT WITH CLIMATOLOGICAL STORM CHANCES IN THESE AREAS SUNDAY FOR THE DAY 7 FORECAST. && .AVIATION...FOR THE 18Z PACKAGE...SCATTERED SHRA/TSRA WILL REDEVELOP TODAY...WITH GENERAL STORM MOTION SLOWLY TOWARD THE EAST. A FEW THUNDERSTORMS MAY PRODUCE LOCALIZED AND BRIEF IFR VSBY IN MODERATE/HEAVY RAIN... STORM ACTIVITY WEAKENING AND BECMG ISOLD BTWN 02-04Z. 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 303 AM MST MON SEP 3 2012 AZZ004>018-037>040-040600- 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- 303 AM MST MON SEP 3 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 SOUTHWEST TO THE EAST NORTHEAST. STORMS THREATS TODAY ARE LIGHTNING...LOCALLY HEAVY RAIN...SMALL HAIL AND WIND GUSTS TO 45 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. 41
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1038 AM MST MON SEP 3 2012 AZZ016-018-031800- GILA AZ-COCONINO AZ- 1038 AM MST MON SEP 3 2012 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTH CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA EXTREME SOUTHEASTERN COCONINO COUNTY IN NORTH CENTRAL ARIZONA UNTIL 1100 AM MST AT 1028 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR FOREST LAKES...MOVING SOUTHEAST AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... FOREST LAKES... HIGHWAY 260 FROM MILEPOST 285 TO THE NAVAJO COUNTY LINE PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 3434 11075 3426 11082 3434 11093 3443 11082 TIME...MOT...LOC 1736Z 313DEG 8KT 3434 11083 JJ
The Flagstaff radar (KFSX), 80 km away, was scanning. The volume nearest the first event began at 20:16 UTC.
1 heavy rain, 1 hail. Local standard time, as filed.
Heavy rain (0.62 inch) fell in Doney Park with ponding water around the property.
Spotters reported 3/4 inch diameter hail that stripped leaves from trees and ruined a garden.
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: 412962, 412963.