A thunderstorm created severe winds in St Johns.
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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 created severe winds in St Johns.
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 1, 2:40 PM MST, 2 hours 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 240 PM MST TUE SEP 1 2009 .SYNOPSIS...EXPECT GRADUALLY INCREASING CHANCES FOR RAIN SHOWERS AND THUNDERSTORMS THROUGH THE WEEKEND WITH TEMPERATURE COOLING CORRESPONDINGLY. LOOK FOR DRYING FROM OUR WEST AND SOUTHWEST BEGINNING MONDAY. && .DISCUSSION...SCATTERED RAIN SHOWERS AND ISOLATED THUNDERSTORMS CONTINUE OVER NORTHERN ARIZONAS HIGHER TERRAIN THIS AFTERNOON AND WILL DIMINISH WITHIN A FEW HOURS OF SUNSET. MID-LEVEL HIGH PRESSURE LOCATED OVER NEW MEXICO TODAY WILL DRIFT NORTHWESTWARD AND BE CENTERED OVER UTAH BY TOMORROW EVENING. BY THURSDAY AFTERNOON...IT WILL DEVELOP INTO A NORTHEAST-TO-SOUTHWEST RIDGE AXIS EXTENDING FROM ABOUT GRAND JUNCTION TO SAN DIEGO AND OFFSHORE INTO THE EASTERN PACIFIC. THIS ORIENTATION AND POSITIONING WILL REMAIN STEADY THROUGH FRIDAY. EARLY IN THIS PERIOD...MOISTURE WILL INCREASE SLIGHTLY DUE TO LIGHT SOUTHEASTERLY OR SOUTHERLY FLOW AROUND THE HIGH. THURSDAY INTO FRIDAY...IT APPEARS WELL SEE MORE RECYCLED MOISTURE RATHER THAN ADDITIONAL MOISTURE ADVECTION FROM THE SOUTH. THIS MOISTURE...PAIRED WITH MORE UNSTABLE CONDITIONS...WILL CAUSE A GRADUAL INCREASE IN THE NUMBER AND AREAL EXTENT OF RAIN SHOWERS AND THUNDERSTORMS LATER THIS WEEK. BEYOND FRIDAY...MODELS ARE FAIRLY CONSISTENT TO OUR NORTH...BUT DIVERGE IN THEIR SOLUTIONS WHEN IT COMES TO THE PATH THAT ANY REMNANTS OF JIMENA MIGHT TAKE. THE NATIONAL HURRICANE CENTER SAID AS MUCH IN THEIR 200 PM MST DISCUSSION /SEE PRODUCT TCDEP3/. EVEN SO...WE HAVE A CHANCE OF EITHER SEEING MOISTURE FROM JIMENA DIRECTLY IF IT SHOULD TRACK NORTH AS IT FALLS APART OR FROM A LOW-LEVEL GULF MOISTURE SURGE IF JIMENA STALLS TO THE SOUTH. AS A RESULT...WEVE INCREASED CHANCES FOR PRECIPITATION OVER THE WEEKEND. BY LATE SUNDAY...AN APPROACHING PACIFIC TROUGH WILL USHER IN DRYER AIR FROM THE WEST AND SOUTHWEST POTENTIALLY USHERING IN A PERIOD OF LESS CONVECTION. && .AVIATION...FOR THE 00Z PACKAGE...SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS NORTHERN ARIZONA THROUGH THE AFTERNOON AND EVENING. LOCAL MVFR FLIGHT CONDITIONS CAN BE EXPECTED IN SOME OF THE THUNDERSTORMS...WITH BRIEF IFR VISIBILITIES IN THE STRONGEST STORMS. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DIMINISH DURING THE LATE EVENING HOURS TO ISOLATED ACTIVITY OVERNIGHT. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC..................HOWARD AVIATION/FIRE WEATHER...KD VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 956 AM MST TUE SEP 1 2009 AZZ004>018-037>040-021700- 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- 956 AM MST TUE SEP 1 2009 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 EXPECT SCATTERED RAIN SHOWERS AND THUNDERSTORMS PRIMARILY OVER HIGHER TERRAIN SOUTH AND WEST OF A LINE FROM SPRINGERVILLE TO JACOB LAKE. THE ONSET OF CONVECTION WILL BE DELAYED IN THE NORTHERN AND WESTERN REACHES OF THIS AREA DUE TO MORNING CLOUD COVER. STORM MOTION WILL BE SLOW AND TO THE NORTH. STORMS MAY CAUSE LOCALIZED NUISANCE FLOODING. AN ISOLATED STORM OR TWO MAY PRODUCE HAIL UP TO 1 INCH IN DIAMETER. ACTIVITY WILL DIE DOWN WITHIN A FEW HOURS OF SUNSET. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY EXPECT CONTINUED AFTERNOON AND EVENING RAIN SHOWERS AND THUNDERSTORMS. GREATEST CHANCES WILL BE OVER THE WEEKEND WITH SOME POSSIBILITY OF INCREASED MOISTURE COURTESY OF A DISSIPATING TROPICAL CYCLONE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. HOWARD
The Flagstaff radar (KFSX), 167 km away, was scanning. The volume nearest the first event began at 00:37 UTC.
1 thunderstorm wind. Local standard time, as filed.
The winds from a thunderstorm gusted to 64 MPH at the St Johns ASOS.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2009Every state in 2009This day in weather historyWarnings in Arizona, September 2009
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: 196366.