Heavy rain from thunderstorms produced local flash flooding across 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.
Heavy rain from thunderstorms produced local flash flooding across 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 17, 9:53 AM MST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 953 AM MST SAT AUG 17 2013 .SYNOPSIS...AVERAGE MONSOON MOISTURE WILL REMAIN OVER MOST OF NORTHERN ARIZONA INTO NEXT WEEK. THIS WILL PROVIDE A GOOD CHANCE FOR AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS EACH DAY. && .DISCUSSION...HIGH PRESSURE IS CENTERED NEAR THE AZ/NM THIS MORNING WITH A MOIST SOUTHERLY FLOW IN PLACE. OVERALL MOISTURE VALUES ACROSS THE STATE ARE SLIGHTLY HIGHER THAN YESTERDAY. THERE ARE ALSO A COUPLE OF UPPER LEVEL DISTURBANCES TO TAKE NOTE OF THIS MORNING. THE FIRST DISTURBANCE KICKED OFF A RATHER ORGANIZED AREA OF THUNDERSTORMS THAT CLIPPED FAR NORTHERN COCONINO COUNTY NEAR PAGE. MOST OF THESE STORMS HAVE MOVED NORTH INTO SOUTHERN UT AS THE DISTURBANCE IS ALSO MOVING NORTH. SATELLITE IMAGERY SHOWS MID LEVEL CLOUD DEVELOPMENT OVER CENTRAL AND WESTERN AZ IN RESPONSE TO A SECOND DISTURBANCE OVER SOUTHERN CA. THOUGH OVERALL WE EXPECT SCATTERED THUNDERSTORMS TO DEVELOP...THIS DISTURBANCE WILL TRACK NORTHEAST INTO NORTHERN AZ THIS AFTERNOON AND EVENING POSSIBLY ENHANCING CONVECTIVE DEVELOPMENT FOR OUR WESTERN AREAS. THE PRIMARY STORM THREATS TODAY WILL BE LOCALLY HEAVY RAIN...MOSTLY SMALL HAIL...AND LIGHTNING. THE HIGH CENTER IS FORECAST TO REMAIN IN THIS POSITION THROUGH EARLY NEXT WEEK. THE RESULTING SOUTHERLY FLOW WILL KEEP PRECIPITABLE WATER VALUES AT OR ABOVE NORMAL FOR THIS TIME OF YEAR...ADEQUATE FOR DAILY ROUNDS OF SCATTERED THUNDERSTORMS. THE HIGH PRESSURE CENTER ELONGATES NORTH AND EASTWARD MID TO LATE NEXT WEEK ENCOMPASSING MUCH OF THE CENTRAL PORTION OF THE COUNTRY. THE LAST FEW MODEL RUNS INDICATE LITTLE IN THE WAY OF DRYING NEXT WEEK (EARLIER RUNS WERE SHOWING DRYING AS A RESULT OF SW FLOW ASSOCIATED WITH THE CALIFORNIA LOW). RAIN CHANCES IN THIS MORNINGS FORECAST PACKAGE WERE INCREASED A BIT FOR MID TO LATE WEEK...TO REFLECT THE LATEST MODEL SOLUTIONS. && .AVIATION...FOR THE 18Z PACKAGE...EXPECT SCT TO NMRS SHRA/TSRA TODAY. A UPPER LEVEL TROUGH MAY SUPPORT A GREATER NUMBER OF TS/SH OVER PORTIONS OF COCONINO AND YAVAPAI COUNTIES THIS AFTERNOON AS THE TROUGH PASSES THRU THIS AREA. STRONGER STORMS WILL PRODUCE ERRATIC GUSTY WINDS AND IFR CONDITIONS. AFTER 03Z SUNDAY...STORM COVERAGE WILL BECOME MORE ISOLD... MORE STORMS DEVELOP AGAIN AROUND 18Z SUNDAY. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.........MCS/JJ AVIATION.......TC FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1036 AM MST SAT AUG 17 2013 AZZ007-171800- COCONINO AZ- 1036 AM MST SAT AUG 17 2013 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... WEST CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA UNTIL 1100 AM MST AT 1033 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 10 MILES NORTHEAST OF LAGUNA LAKE...MOVING NORTHEAST AT 10 MPH. HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT LIGHTNING. WIND GUSTS UP TO 40 TO 50 MPH WILL ALSO BE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEEK SHELTER INDOORS UNTIL THE STORM PASSES. && LAT...LON 3620 11302 3610 11276 3592 11291 3600 11310 TIME...MOT...LOC 1735Z 208DEG 8KT 3604 11296 MCS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1059 AM MST SAT AUG 17 2013 AZZ006-007-171830- COCONINO AZ- 1059 AM MST SAT AUG 17 2013 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... WEST CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA UNTIL 1130 AM MST AT 1058 AM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 10 MILES NORTHEAST OF LAGUNA LAKE...MOVING NORTHEAST AT 10 MPH. HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. WIND GUSTS UP TO 50 MPH ARE ALSO POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 3619 11296 3608 11270 3577 11297 3586 11318 TIME...MOT...LOC 1759Z 222DEG 10KT 3601 11293 MCS
The Flagstaff radar (KFSX), 33 km away, was scanning. The volume nearest the first event began at 18:10 UTC.
1 heavy rain, 1 flash flood. Local standard time, as filed.
One inch of rain fell in 45 minutes near Hutch Mountain.
Flood water entered a home on Cosnino Road. Flooding was also reported on Wapiti and Casnino Road. About half a foot of water covered Towsend-Winona Road about half a mile west of the Interstate 40 junction.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2013Every state in 2013This day in weather historyWarnings in Arizona, August 2013
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: 474676, 474464.