Deep monsoon moisture moved northwest over Arizona which interacted with an upper level low pressure trough over Sonora to produce heavy rain for a couple of days over portions of northern Arizona.
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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.
Deep monsoon moisture moved northwest over Arizona which interacted with an upper level low pressure trough over Sonora to produce heavy rain for a couple of days over portions of northern Arizona.
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 Aug 12, 3:50 AM MST, 4 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 350 AM MST TUE AUG 12 2014 .SYNOPSIS...MONSOON MOISTURE WILL INCREASE THROUGH WEDNESDAY THUS EXPECT NUMEROUS SHOWERS AND THUNDERSTORMS ACROSS THE NORTHLAND. STARTING THURSDAY...SOUTHWESTERLY FLOW SHOULD BRING DRIER AIR INTO NORTHWEST ARIZONA...WITH DECREASING STORM CHANCES ACROSS THE KAIBAB PLATEAU. THE DRY AIR SPREADS EASTWARD ON FRIDAY AND THE WEEKEND IS CURRENTLY LOOKING DRY FOR ALL EXCEPT THOSE ALONG THE MOGOLLON RIM WHERE A SLIGHT CHANCE OF AFTERNOON STORMS WILL CONTINUE. && .DISCUSSION... FOR TODAY THROUGH WEDNESDAY... RADAR AND SAT IMAGERY SHOW WIDELY SCATTERED LIGHT SHOWERS ONGOING ACROSS ARIZONA THIS MORNING...WITH A LARGER THUNDERSTORM COMPLEX ALONG THE MEXICAN BORDER HEADED NORTHWESTWARD TO YUMA AND BLYTHE. THE MONSOON PLUME IS RUNNING FROM SOUGHT TO NORTH ACROSS OUR STATE. PROGS INDICATE DEEP LAYERED SOUTH TO SOUTHEAST FLOW ALOFT WILL BRING INCREASING MONSOON MOISTURE ACROSS NORTHERN ARIZONA THROUGH WEDNESDAY NIGHT...WITH PRECIPITABLE WATER VALUES WELL ABOVE NORMAL FOR THIS TIME OF YEAR ON WEDNESDAY. THERE IS AN UPPER LEVEL DISTURBANCE OVER SONORA MEXICO NOW THAT PROGS BRING NORTHWARD INTO NORTHERN ARIZONA LATE TONIGHT THROUGH WEDNESDAY MORNING. WHILE THESE FACTORS FAVOR PRECIPITATION...THERE IS EXTENSIVE CLOUD COVER ACROSS THE STATE AND HIGH LEVEL WINDS SHOULD BRING MORE DEBRIS CLOUD FROM THE COMPLEX NOW NEAR YUMA NORTHWARD WHICH SHOULD INHIBIT STRONG CONVECTION THROUGH AT LEAST LATE THIS MORNING. WE WILL HOLD OFF ON A FLASH FLOOD WATCH FOR NORTHERN ARIZONA FOR NOW AND DO AGREE WITH THE PREVIOUS SHIFT THAT CONVECTIVE ACTIVITY WILL CONTINUE OVERNIGHT TONIGHT...ESPECIALLY FOR AREAS WEST OF A LINE FROM PAGE TO PAYSON. THURSDAY AND FRIDAY...DRIER SOUTHWEST FLOW ALOFT RETURNS TO FAR NORTHWEST ARIZONA LEADING TO A DECREASING CHANCE OF STORMS NORTH OF LINE FROM WINDOW ROCK TO SUPAI. THE MONSOON PLUME IS BEING PUSHED EASTWARD WITH TIME AND SCATTERED STORM COVERAGE IS EXPECTED ALONG THE MOGOLLON RIM THURSDAY AFTERNOON. STILL KEPT A WIDESPREAD SLIGHT CHANCE OF DAYTIME STORMS GOING FRIDAY. SATURDAY AND SUNDAY...HIGH PRESSURE BECOMES CENTERED ARIZONA THIS WEEKEND...WITH LIGHT WEST TO NORTHWEST WINDS ALOFT SATURDAY. CROSS SECTIONS SHOW LITTLE MOISTURE FOR MOST OF THE AREA. THUS THE FORECAST SHOWS A SLIGHT CHANCE OF DAYTIME STORMS ALONG THE MOGOLLON RIM FROM FLAGSTAFF SOUTHEASTWARD AND DRY ELSEWHERE. OVERNIGHT MIN TEMPS IN THE LOWER 40S ARE PROBABLE IN THE COOLER SPOTS IN THE HIGH COUNTRY. && .AVIATION...FOR THE 12Z PACKAGE...SCT SHRA/TSRA WILL BECOME WDSPRD BY LATE MORNING...LASTING THROUGH THE FORECAST PERIOD. ISOLD +TSRA POSSIBLE AFT 18Z. EXPECT BKN CIGS FROM 6-8KFT AGL MOST AREAS...WITH CIGS AS LOW AS 3-4KFT AGL IN HEAVIER RAIN. MOST PRECIPITATION WILL BE VFR...BUT STRONGER STORMS WILL PRODUCE MVFR. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........DL AVIATION.......PETERSON FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 430 AM MST TUE AUG 12 2014 AZZ004>018-037>040-130700- 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- 430 AM MST TUE AUG 12 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY AND TONIGHT. SHOWER AND THUNDERSTORM COVERAGE WILL EXPAND ACROSS NORTHERN ARIZONA TODAY AS DEEP MONSOONAL MOISTURE RETURNS. STORM MOTION WILL GENERALLY BE FROM SOUTH TO NORTH. LOCALLY HEAVY PRECIP AMOUNTS ARE POSSIBLE. RAINFALL IS EXPECTED TO CONTINUE TONIGHT...ESPECIALLY ACROSS AREAS WEST OF A LINE FROM PAGE TO PAYSON. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ON WEDNESDAY...DEEP TROPICAL MOISTURE AND SOUTHERLY FLOW WILL KEEP WIDESPREAD RAINFALL ACROSS THE AREA WEDNESDAY. AREAS OF MODERATE AND BRIEFLY HEAVY RAIN ARE POSSIBLE. STARTING THURSDAY...DRIER WILL MOVE INTO NORTHWEST ARIZONA WITH DECREASING STORM CHANCE ON THE KAIBAB PLATEAU. THE DRIER AIR SPREADS EASTWARD ON FRIDAY LEADING TO MUCH LESS CONVECTIVE COVERAGE FROM FRIDAY THROUGH SUNDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. 41
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
A trained spotter 7 miles northeast of Parks reported 4.14 inches of rain in 32 hours with flooding on a forest road near Government Mountain. Another spotter northwest of Parks reported 1.95 inches of rain in about the same time period.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2014Every state in 2014This day in weather historyWarnings in Arizona, August 2014
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: 541872.