1 hail, as filed by the National Weather Service.
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 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 13, 9:40 AM MST, 4 hours earlier.
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 940 AM MST THU SEP 13 2001 .SYNOPSIS...AN AREA OF LOW PRESSURE OVER NORTHERN CALIFORNIA AND HIGH PRESSURE OVER MEXICO WILL CONTINUE TO PRODUCE A MOIST SOUTHERLY FLOW ACROSS ARIZONA TODAY. LOOK FOR AN INCREASE IN SHOWERS AND THUNDERSTORMS THIS AFTERNOON...MORE NUMEROUS ALONG AND SOUTHEAST OF A LINE FROM CANYON DE CHELLY NATIONAL MONUMENT TO SEDONA. A FEW THUNDERSTORMS COULD PRODUCE LOCALLY HEAVY RAIN AND RAPID RUN OFF. THE MOIST AND UNSTABLE FLOW WILL CONTINUE THROUGH THE WEEKEND...AND INTO THE EARLY OF NEXT WEEK. BY MID WEEK A WESTERLY FLOW ALOFT WILL BRING DRIER WEATHER TO NORTHERN ARIZONA. .DISCUSSION...LAPSE RATES AROUND 7.0 TO 7.5 DEGREE C/KM BETWEEN 700 TO 500 MB OVER NORTHWEST ARIZONA TRANSITIONING TO 5.5 DEGREE C/KM OVER THE WHITE MOUNTAINS THIS MORNING. PRECIP WATER IS THE LEAST OVER THE NORTHWEST PER WATER VAPOR AND AROUND .75 INCHES AT FLAGSTAFF... INCREASING TO AROUND AN INCH OVER THE WHITE MOUNTAINS. SHEAR VECTOR IS THE WEAKEST OVER THE WHITES AND STRONGEST OVER THE KAIBAB PLATEAU. THERE WILL BE THE POSSIBILITY TODAY FOR ISOLATED STRONG STORMS TO THE NORTHWEST OF FLAGSTAFF IN THE BETTER INSTABILITY AND SHEAR. ALONG AND SOUTH OF A LINE FROM WINDOW ROCK TO PAYSON LOCALLY HEAVY RAIN CONTRIBUTED TO HIGH PRECIP WATER...SLOW MOVING STORMS AND WEAK LARGE SCALE ASCENT...LAPSE RATES CLOSE TO MOIST ADIABATIC THIS AFTERNOON...SO NOT EXPECTING STRONG STORMS IN THIS AREA. CHANCES OF PRECIP TODAY LOOK GOOD...WILL UPDATE ZONES TO ADD WORDING IN THE ZONES FOR LOCALLY HEAVY FROM WINDOW ROCK INTO THE EASTERN MOGOLLON RIM...WHITE MOUNTAIN AND NORTHERN GILA COUNTY ZONES. .FGZ...NONE.
AZZ004>018-037>040-131930- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1015 AM MST THU SEP 13 2001 ...SCATTERED THUNDERSTORMS OVER NORTHERN ARIZONA TODAY... ...A FEW STORMS WILL PRODUCE LOCALLY HEAVY RAIN WHICH COULD PRODUCE RAPID RUNOFF INTO SOME OF THE DRY WASHES... AN AREA OF LOW PRESSURE OVER NORTHERN CALIFORNIA AND HIGH PRESSURE OVER MEXICO WILL CONTINUE TO PRODUCE A MOIST SOUTHERLY FLOW ACROSS ARIZONA TODAY. LOOK FOR AN INCREASE IN SHOWERS AND THUNDERSTORMS THIS AFTERNOON...MORE NUMEROUS ALONG AND SOUTHEAST OF A LINE FROM CANYON DE CHELLY NATIONAL MONUMENT TO SEDONA. A FEW THUNDERSTORMS COULD PRODUCE LOCALLY HEAVY RAIN...ON THE ORDER OF ONE TO THREE INCHES IN A SHORT PERIOD OF TIME...ALONG WITH RAPID RUNOFF INTO NORMALLY DRY WASHES AND SLOT CANYONS. EXPECT GUSTY WINDS BETWEEN 20 TO 40 MPH FROM SOME OF THE THUNDERSTORMS AS WELL.
AZZ004>018-037>040-141930-
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1105 AM MST THU SEP 13 2001
...FLASH FLOOD WATCH THROUGH THIS EVENING ALONG AND SOUTH OF A LINE
FROM WINDOW ROCK TO SELIGMAN...
...SOME THUNDERSTORM WILL PRODUCE LOCALLY HEAVY RAIN WHICH COULD
PRODUCE RAPID RUNOFF INTO SOME OF THE DRY WASHES...
...A FEW THUNDERSTORMS WITH LARGE HAIL AND GUSTY WINDS...
HIGH PRESSURE CIRCULATION JUST SOUTHWEST OF THE BIG BEND REGION IN
TEXAS WILL CONTINUE TO PRODUCE A MOIST SOUTHERLY FLOW ACROSS ARIZONA
TODAY. LOOK FOR AN INCREASE IN SHOWERS AND THUNDERSTORMS BY LATE
MORNING...BECOMING MORE NUMEROUS DURING THE AFTERNOON. THE MAIN AREA
OF CONCERN FOR HEAVY RAIN RUNS ALONG AND SOUTH OF A LINE FROM
WINDOW ROCK TO FLAGSTAFF TO SELIGMAN. IN THIS AREA...SOME
THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAIN...ON THE ORDER OF TWO
TO THREE INCHES IN A SHORT PERIOD OF TIME...ALONG WITH RAPID RUNOFF
INTO NORMALLY DRY WASHES. THUNDERSTORMS NORTH OF THE WINDOW ROCK TO
SELIGMAN LINE HAVE THE POTENTIAL TO PRODUCE RAINFALL AMOUNTS OF 1 TO
2 INCHES. SLOT CANYONS WILL ESPECIALLY BE PRONE TO FLOODING IF THE
CONDITIONS ARE RIGHT. EXPECT A FEW THUNDERSTORMS WITH LARGE HAIL AND
GUSTY WINDS BETWEEN 20 TO 40 MPH FROM SOME OF THE THUNDERSTORMS AS
WELL.The Flagstaff radar (KFSX), 68 km away, was scanning. The volume nearest the first event began at 20:40 UTC.
1 hail. Local standard time, as filed.
Nickel (0.88 inch diameter) sized hail fell in Winslow for five minutes. Heavy rain and wind gusts to 53 MPH were reported at the Winslow airport with this thunderstorm. Traffic on I-40 slowed to a crawl because of the storm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2001Every state in 2001This day in weather historyWarnings in Arizona, September 2001
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: 5268491.