Thunderstorms produced heavy rain in Forest Lakes.
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.
Thunderstorms produced heavy rain in Forest Lakes.
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 27, 2:50 PM MST, 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 250 PM MST SAT AUG 27 2011 .SYNOPSIS...EXPECT SCATTERED SHOWERS AND THUNDERSTORMS EACH AFTERNOON AND EVENING THIS WEEKEND...AS WELL ABOVE NORMAL DAYTIME TEMPERATURES. EARLY NEXT WEEK...A LOW PRESSURE TROUGH WILL MOVE THROUGH THE WESTERN STATES BRINGING DRIER AIR AND A DECREASING TREND IN THUNDERSTORM ACTIVITY TO NORTHWESTERN ARIZONA. && .DISCUSSION...HIGH PRESSURE REMAINS CENTERED OVER NORTHWESTERN NEW MEXICO BRINGING A GENERAL SOUTHEASTERLY FLOW PATTERN TO MOST OF NORTHERN AZ. SOMEWHAT DRIER AIR HAS MOVED OVER NORTHERN AZ ACCORDING TO SATELLITE PRECIPITABLE WATER ESTIMATES AND SURFACE DEWPOINT OBSERVATIONS...ALTHOUGH INSTABILITY COMBINED WITH THIS MOISTURE HAS BEEN SUFFICIENT TO DEVELOP SCATTERED THUNDERSTORMS OVER THE HIGHER TERRAIN EARLY THIS AFTERNOON. LATE THIS AFTERNOON AND EVENING...THUNDERSTORMS SHOULD SPREAD OUT INTO THE LOWER VALLEY LOCATIONS. FOR SUNDAY...EXPECTING SIMILAR THUNDERSTORM ACTIVITY AS THE AIR MASS OVER NORTHERN ARIZONA RETAINS ROUGHLY THE SAME MOISTURE AND INSTABILITY PROPERTIES WITH WEAK FLOW AS THE HIGH WOBBLES OVER NORTHEAST ARIZONA. TEMPERATURES WILL BE SEVERAL DEGREES WARMER THAN NORMAL FOR THE NEXT FEW DAYS...AND AN EXCESSIVE HEAT WARNING FOR TODAY...AND EXCESSIVE HEAT WATCH FOR SUNDAY CONTINUES OVER THE LOWER ELEVATIONS OF YAVAPAI AND GILA COUNTIES. MONDAY THROUGH THURSDAY OF NEXT WEEK...A LOW PRESSURE TROUGH WILL SLOWLY DEVELOP AND MOVE EAST ACROSS THE WESTERN STATES. THIS WILL BRING DRIER SOUTHWESTERLY FLOW ACROSS NORTHERN ARIZONA...DECREASING PRECIPITATION CHANCES MAINLY ACROSS THE NORTHWESTERN PORTIONS OF THE STATE. && .AVIATION...FOR THE 00Z PACKAGE...SCATTERED SHOWERS AND THUNDERSTORMS WITH CLOUDS BASES OF 15-20 KFT MSL WILL CONTINUE ACROSS NORTHERN ARIZONA THROUGH 03Z/SUN. MVFR/IFR CONDITIONS AND STRONG GUSTY WINDS WILL BE POSSIBLE WITH THE STORMS. ACTIVITY WILL TAPER OFF SHORTLY AFTER SUNSET THOUGH SCT-BKN CLOUD COVER MAY LINGER THROUGH 06Z/SUN. AFTER 18Z/SUN SCT SHOWERS AND THUNDERSTORMS WILL REDEVELOP WITH 15-20 KFT MSL CLOUD BASES AND MVFR/IFR CONDITIONS WITHIN THE THUNDERSTORMS. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES... EXCESSIVE HEAT WARNING UNTIL 8 PM MST THIS EVENING FOR AZZ018-037 BELOW 4000 FEET ELEVATION. EXCESSIVE HEAT WATCH FROM SUNDAY MORNING THROUGH SUNDAY EVENING FOR AZZ018-037 BELOW 4000 FEET ELEVATION. && PUBLIC...........DJO AVIATION.........CO FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 400 AM MST SAT AUG 27 2011 AZZ004>018-037>040-280800- 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- 400 AM MST SAT AUG 27 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 VERY HOT TEMPERATURES ARE LIKELY IN THE LOWER ELEVATIONS OF YAVAPAI AND NORTHERN GILA COUNTIES THIS AFTERNOON...AND AN EXCESSIVE HEAT WARNING IS IN EFFECT. IN ADDITION...EXPECT SCATTERED THUNDERSTORMS TO CONTINUE AFFECTING PORTIONS OF NORTHERN ARIZONA TODAY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY WELL ABOVE NORMAL TEMPERATURES ARE AGAIN LIKELY FOR SUNDAY...AND AN EXCESSIVE HEAT WATCH IS IN EFFECT FOR THE LOWER ELEVATIONS OF YAVAPAI AND NORTHERN GILA COUNTIES. COVERAGE OF THUNDERSTORMS WILL DECREASE FOR MOST AREAS NEXT WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. KD
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
212 PM MST SAT AUG 27 2011
AZZ008-037-272200-
YAVAPAI AZ-
212 PM MST SAT AUG 27 2011
THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
SOUTHEASTERN YAVAPAI COUNTY IN WEST CENTRAL ARIZONA
UNTIL 300 PM MST
AT 206 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 10 MILES EAST OF BLACK CANYON CITY. THIS STORM
WAS NEARLY STATIONARY.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
POSSIBLE WITH THIS STORM...ALONG WITH HEAVY RAIN.
LOCATIONS IMPACTED INCLUDE...
RURAL SOUTHEASTERN YAVAPAI COUNTY...WIND GUSTS COULD IMPACT I-17
BETWEEN MILE POST 242 AND 260.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU ARE IN THE ADVISORY AREA AND STORMS APPROACH...TAKE SHELTER IN
A STURDY BUILDING.
&&
LAT...LON 3428 11215 3407 11177 3400 11185 3404 11212
3406 11218
TIME...MOT...LOC 2110Z 130DEG 2KT 3406 11193
MASThe national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Thunderstorms produced 1.70 inches of rain in just 45 minutes. Minor street flooding was reported.
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: 343598.