A thunderstorm produced quarter sized hail near Williams.
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The episode as NWS FGZ wrote it up.
A thunderstorm produced quarter sized hail near Williams.
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 29, 9:30 AM MST, 5 hours 20 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST FRI AUG 29 2008 .SYNOPSIS....A HIGH PRESSURE CENTER WILL MOVE EASTWARD ALONG THE ARIZONA UTAH BORDER TODAY PRODUCING A STABLE AND DRIER PATTERN ACROSS MUCH OF THE NORTHLAND TODAY. A TROUGH PATTERN IS EXPECTED TO MOVE INTO ARIZONA OVER THE LABOR DAY WEEKEND PRODUCING A CHANCE FOR STRONG TO SEVERE THUNDERSTORMS ALONG WITH HEAVY RAIN. OVERNIGHT THUNDERSTORM ACTIVITY ACROSS MUCH OF THE NORTHLAND IS A STRONG POSSIBILITY FOR BOTH SATURDAY AND SUNDAY NIGHTS. && .DISCUSSION...STRONG THUNDERSTORMS IN SOUTHERN ARIZONA OVERNIGHT HAVE SENT A SHALLOW MOISTURE PLUME NORTHWARD...RAISING DEW POINT TEMPERATURES AS FAR NORTH AS KINGMAN AND FLAGSTAFF. A FOG BANK WAS OBSERVED THIS MORNING BETWEEN FLAGSTAFF AND PARKS AS THE BOUNDARY LAYER WAS COOLED OVERNIGHT TO THE CONDENSATION POINT. THIS THIN MOISTURE LAYER WILL LIKELY MIX OUT LATER THIS MORNING AS THE LATEST SOUNDINGS FROM FLAGSTAFF INDICATE AN EXTREMELY DRY LAYER ALOFT. THE BEST CHANCES FOR SHOWERS AND THUNDERSTORMS TODAY WILL BE OVER THE WHITE MOUNTAINS...THE EASTERN MOGOLLON RIM AND NORTHERN GILA COUNTY. SATURDAY THROUGH MONDAY...AN EARLY SEASON SHORT WAVE TROUGH IS EXPECTED TO MOVE INTO THE GREAT BASIN STARTING ON SATURDAY. THIS SYSTEM WILL BRING UP ADDITIONAL MOISTURE FROM THE SOUTH...DECREASE ATMOSPHERIC STABILITY AND ENHANCE THUNDERSTORM AND SHOWER ACTIVITY ACROSS THE NORTHLAND. THERE IS A STRONG POSSIBILITY THAT SOME OF THESE THUNDERSTORMS WILL BE SEVERE WITH STRONG GUSTY WINDS AND LARGE HAIL. THIS TROUGH PATTERN ALSO HAS THE POTENTIAL TO CAUSE NOCTURNAL THUNDERSTORM DEVELOPMENT ON BOTH SATURDAY AND SUNDAY NIGHTS. TUESDAY THROUGH THURSDAY...A STABLE AND DRY AIRMASS WILL MOVE INTO THE REGION. EXPECT CLEARING SKIES AND DRIER CONDITIONS BY THE MIDDLE OF NEXT WEEK. && .AVIATION...FOR THE 18Z PACKAGE...EXPECT ISOLD-SCT SHRA/TSRA TO DEVELOP MAINLY ALONG AND SOUTH OF A LINE FROM KPRC TO KSJN. MVFR/IFR CONDITIONS MAY OCCUR WITHIN THE STRONGER STORMS. CONVECTIVE ACTIVITY DIMINISHING AFTER 03Z. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FIRE WEATHER...SEE FIRE WEATHER FORECAST (FWFFGZ) FOR DISCUSSION OF DAYS 1 AND 2. SUNDAY THROUGH TUESDAY...AN EARLY SEASON LOW PRESSURE SYSTEM WILL MOVE ACROSS THE SOUTHERN GREAT BASIN ON SUNDAY AND MONDAY. EXPECT SCATTERED SHOWERS AND THUNDERSTORMS ON SUNDAY AND MONDAY DECREASING TO ISOLATED ACTIVITY ON TUESDAY. EXPECT SOUTHWEST WINDS OF 10 TO 20 MPH WITH GUSTS APPROACHING 30 MPH DURING THE AFTERNOON ON SUNDAY AND MONDAY. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. PUBLIC...............BOHLIN AVIATION/FIRE WX.....DB VISIT WEATHER.GOV/FLAGSTAFF FOR NORTHERN ARIZONA WEATHER INFORMATION.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 943 AM MST FRI AUG 29 2008 AZZ004>018-037>040-300745- 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- 943 AM MST FRI AUG 29 2008 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 A HIGH PRESSURE CENTER MOVING EASTWARD ALONG THE ARIZONA UTAH BORDER TODAY WILL STABILIZE THE AIRMASS FROM THE FLAGSTAFF AREA NORTHWARD WITH ONLY SLIGHT CHANCES FOR ISOLATED THUNDERSTORM ACTIVITY EXPECTED OVER EXTREME NORTHERN ARIZONA. THE AIRMASS REMAINS MOIST AND UNSTABLE SOUTH OF THE FLAGSTAFF AREA OVER CENTRAL ARIZONA...WHERE ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE ESPECIALLY OVER THE WHITE MOUNTAINS AND EASTERN MOGOLLON RIM. STORM MOTION IS FROM THE SOUTHEAST TO THE NORTHWEST TODAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ON SATURDAY AND SUNDAY FORECAST MODELS SHOW AN UPPER LEVEL TROUGH MOVING INTO THE SOUTHWEST. THIS TROUGH WILL BRING UP ADDITIONAL MOISTURE FROM THE SOUTH...ENHANCE THUNDERSTORM ACTIVITY DURING THE DAY AND THE NIGHT AND PRODUCE A STRONG POSSIBILITY FOR SEVERE THUNDERSTORM ACTIVITY. BY MONDAY MUCH OF THE MOISTURE WILL BE SWEPT NORTHWARD WITH A DECREASE IN SHOWER AND THUNDERSTORM ACTIVITY FOR MUCH OF NORTHERN ARIZONA. EXPECT A MARKED DECREASE IN THUNDERSTORM ACTIVITY FROM TUESDAY THROUGH THURSDAY AS A DRIER AND MORE STABLE AIRMASS MOVES INTO THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. RB
The Flagstaff radar (KFSX), 117 km away, was scanning. The volume nearest the first event began at 21:51 UTC.
1 hail. Local standard time, as filed.
Quarter sized (1 inch diameter) hail fell for about 10 minutes with heavy rain in Williams.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2008Every state in 2008This day in weather historyWarnings in Arizona, August 2008
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: 132319.