Wind from a thunderstorm caused damage in Chino Valley. 70) from the thunderstorm also caused flooding.
Every event with a place to put it. Tap one for its entry below.
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.
Wind from a thunderstorm caused damage in Chino Valley. Heavy rain (1.70) from the thunderstorm also caused flooding.
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 19, 2:30 PM MST, 1 hour 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST FRI AUG 19 2011 .SYNOPSIS...A MOIST AND UNSTABLE AIR MASS WILL BRING SHOWERS AND THUNDERSTORMS TO THE REGION TODAY AND SATURDAY. OVER THE WEEKEND A DRY SOUTHWESTERLY FLOW WILL DEVELOP LIMITING CONVECTIVE ACTIVITY DURING THE EARLY PART OF NEXT WEEK...ESPECIALLY ACROSS THE WESTERN PORTIONS OF THE STATE. && .DISCUSSION...ACTIVE DAY FOR CONVECTION WITH NUMEROUS SHOWERS AND THUNDERSTORMS DEVELOPING...MAINLY ACROSS THE HIGHER TERRAIN OF THE MOGOLLON RIM. SLOW MOVING STORMS HAVE RESULTED IN HEAVY RAINFALL AMOUNTS IN A FEW LOCATIONS ALREADY. SUBTROPICAL HIGH REMAINS CENTERED NEAR TEXAS AND EXTENDS WESTWARD ACROSS NM AND AZ AND HAS ALLOWED A MOIST AND UNSTABLE AIR MASS TO MOVE NORTHWARD ACROSS THE STATE. MORNING SOUNDING INDICATED MODERATE INSTABILITY BUT ONLY WEAK STEERING LEVEL FLOW. THUS EXPECT SLOW MOVING STORMS CAPABLE OF PRODUCING MODERATE TO HEAVY RAINFALL AMOUNTS. THE MAIN THREAT TODAY WILL CONTINUE TO BE HEAVY RAINFALL WITH SOME POTENTIAL FOR LOCALIZED FLOODING. STRONG AND GUSTY WINDS ARE POSSIBLE AS THE STORMS MOVE OFF THE HIGHER TERRAIN AND INTO THE LOWER ELEVATIONS. LITTLE CHANGE IS EXPECTED ON SATURDAY AS THE SAME LARGE SCALE PATTERN WILL REMAIN IN PLACE. BY SUNDAY...A TROUGH WILL DEVELOP ACROSS THE EASTERN PACIFIC STRENGTHENING THE SOUTHWESTERLY FLOW AND BRINGING IN DRIER AIR ACROSS THE SOUTHWEST...INCLUDING THE WESTERN PORTIONS OF ARIZONA. CONVECTIVE ACTIVITY WILL BEGIN A DRYING TREND STARTING IN THE WEST ON SUNDAY AND PROGRESSING EASTWARD ON MONDAY AND TUESDAY. MOISTURE WILL LIKELY BEGIN TO RETURN BY MIDWEEK WITH AN INCREASE IN CONVECTIVE ACTIVITY SPREADING FROM EAST TO WEST. && .AVIATION...FOR THE 00Z PACKAGE...SCT TO NMRS SHRA/TSRA MAINLY SOUTH AND EAST OF A LINE FROM KIGM-KGCN-K0V7. EXPECT ERRATIC AND GUSTY OUTFLOW WINDS...AS WELL AS BRIEF MVFR/LCL IFR CONDITIONS WITH THE STRONGER STORMS. STORMS DISSIPATING 03-06Z...THOUGH SOME SCT-BKN CLOUD COVER WILL LINGER OVERNIGHT. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC........DB AVIATION......DB FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 337 AM MST FRI AUG 19 2011 AZZ004>018-037>040-200645- 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- 337 AM MST FRI AUG 19 2011 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 AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED TODAY WITH THE HIGHEST CONCENTRATION OF STORMS OVER PORTIONS OF SOUTHEAST COCONINO COUNTY...PORTIONS OF YAVAPAI COUNTY...NORTHERN GILA COUNTY AND SOUTHERN NAVAJO AND APACHE COUNTIES. LIGHTNING...LOCALLY HEAVY RAINFALL AND FLOODING WILL BE THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SCATTERED THUNDERSTORMS ARE FORECAST FOR SATURDAY. FOR THE REMAINDER OF THE WEEKEND INTO EARLY NEXT WEEK...A DRIER SOUTHWEST FLOW IS EXPECTED TO AFFECT CENTRAL AND WESTERN PORTIONS OF THE STATE...WITH THE BEST CHANCE OF THUNDERSTORMS SHIFTING INTO EASTERN AND EAST CENTRAL ARIZONA. .SPOTTER INFORMATION STATEMENT. WEATHER SPOTTERS SHOULD REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 116 PM MST FRI AUG 19 2011 AZZ012-015-192030- COCONINO AZ- 116 PM MST FRI AUG 19 2011 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... SOUTH CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA UNTIL 130 PM MST AT 110 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR AND JUST SOUTH OF TWIN ARROWS...MOVING SOUTHEAST AT 5 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... MILEPOST 225 ON I-40... PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAINFALL MAY CAUSE TEMPORARY PONDING ON SOME ROADS. IN HEAVY RAINFALL SLOW DOWN TO REDUCE THE RISK OF HYDROPLANING...AND LEAVE A SAFE DISTANCE BETWEEN YOURSELF AND OTHER VEHICLES. && LAT...LON 3514 11117 3497 11130 3509 11144 3517 11134 TIME...MOT...LOC 2016Z 308DEG 6KT 3511 11128 KD
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
149 PM MST FRI AUG 19 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM FLASH FLOOD 3 W DONEY PARK 35.27N 111.57W
08/19/2011 COCONINO AZ LAW ENFORCEMENT
18 INCHES OF WATER FLOWING ACROSS PINON ROAD IN
TIMBERLINE
&&
EVENT NUMBER FGZ1100220
DBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
211 PM MST FRI AUG 19 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0204 PM FLASH FLOOD 6 NNE FLAGSTAFF 35.27N 111.58W
08/19/2011 COCONINO AZ LAW ENFORCEMENT
SEVERAL ROADS CLOSED DUE TO FLASH FLOODING IN HUTCHISON
ACRES AND TIMBERLINE NEIGHBORHOODS DOWNSTREAM FROM THE
SCHULTZ BURN AREA.
&&
EVENT NUMBER FGZ1100221
BAKSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 253 PM MST FRI AUG 19 2011 AZZ007-008-192200- YAVAPAI AZ-COCONINO AZ- 253 PM MST FRI AUG 19 2011 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... WEST CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA EXTREME NORTHWESTERN YAVAPAI COUNTY IN WEST CENTRAL ARIZONA UNTIL 300 PM MST AT 249 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 8 MILES NORTHWEST OF SELIGMAN...REMAINING NEARLY STATIONARY. EXPECT WIND GUSTS APPROACHING 40 TO 50 MPH WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... SOME UNSECURED OBJECTS WILL BE BLOWN AROUND...TREE LIMBS COULD BE SNAPPED OFF...AND ISOLATED POWER OUTAGES WILL BE POSSIBLE. SEEK SHELTER INDOORS UNTIL THE STORM PASSES. && LAT...LON 3550 11304 3539 11281 3527 11290 3532 11311 TIME...MOT...LOC 2152Z 148DEG 2KT 3539 11300 KD
The Flagstaff radar (KFSX), 116 km away, was scanning. The volume nearest the first event began at 22:58 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Wind from a thunderstorm knocked down several trees. The trees were up to 18 inches in diameter. A few septic storage tanks about 15 feet in diameter blew across Highway 89. One vehicle was damaged by the blowing tanks.
A few side streets were impassible in Chino Valley due to heavy rain from a thunderstorm. Highway 89 had four inches of standing water on it at times.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2011Every state in 2011This day in weather historyWarnings in Arizona, August 2011
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: 342215, 342216.