Showers and thunderstorms propagated off the mountains and into the Roosevelt area late in the afternoon Saturday.
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 PSR wrote it up.
Showers and thunderstorms propagated off the mountains and into the Roosevelt area late in the afternoon Saturday.
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 Phoenix, AZ wrote its last area forecast discussion before the first event at Sep 19, 2:55 PM MST, 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 255 PM MST SAT SEP 19 2009 .SYNOPSIS... HIGH PRESSURE ALOFT WILL BUILD OVER THE NORTHWEST UNITED STATES THE NEXT FEW DAYS. AT THE SAME TIME...A LOW PRESSURE AREA WILL SLIDE SOUTHWARD OUT OF CANADA AND MAKE ITS WAY INTO THE CENTRAL/SOUTHERN PLAINS AND ROCKIES. AFTER A COUPLE OF WARM DAYS TO START OUT THE WEEK...IT APPEARS THAT SOMEWHAT COOLER AIR WILL FILTER INTO THE REGION FROM THE EAST AROUND TUESDAY. WARMER TEMPERATURES ARE ANTICIPATED LATER NEXT WEEK. THE NEXT SEVEN DAYS ARE EXPECTED TO BE RAIN-FREE. && .DISCUSSION... HEFTY BATCH OF THUNDERSTORMS BROKE OUT THIS AFTERNOON OVER OUR FAR ERN CWA...IE ZONE 24. MOST OF THESE STORMS ARE LIKELY HEAVY-RAINERS ...WITH SOME SMALL HAIL AND GUSTY WINDS ALSO QUITE LIKELY. A WEAK UPPER LEVEL SHORTWAVE NOTICEABLE ON THE WV LOOPS WAS PROBABLY GIVING SOME IMPETUS FOR STORM DEVELOPMENT TODAY...ALONG WITH THE SLIGHTLY ELEVATED BL MOISTURE LEVELS AND COOL AIR ALOFT...MINUS 10-11 AT 500MB. STORMS ARE ATTEMPTING TO PROPAGATE SEWD INTO THE LOWER DESERTS...BUT ARE HAVING A HARD TIME DUE TO THE DRY LOW-LEVEL ENVIRONMENT. SO...LEFT SOME TOKEN SLIGHT CHANCES THIS EVENING IN THE SCNTRL LOWER DESERTS...AND CHANCE POPS IN HIGHER TERRAIN OF ZONE 24. THE AFOREMENTIONED SHORTWAVE IS PROGGED TO SLIDE QUICKLY SEWD EARLY THIS EVENING...AND WITH THE SETTING SUN...STORMS SHOULD DIE OFF RAPIDLY. A MUCH DRIER AND MORE STABLE AMS WILL BE THE RULE OVER THE ENTIRE PHX CWA ON SUNDAY...WITH TEMPS CLOSE TO WHAT THEY WERE TODAY. TURNING OUR ATTENTION TO THE UPCOMING WX EVENTS NEXT WEEK. A STRONG SHORTWAVE TROUGH IS FORECAST BY ALL MODELS TO DROP SEWD INTO THE CENTRAL US EARLY NEXT WEEK...WHILE A STRONG UPPER HIGH TAKES SHAPE OVER THE PAC NW. AS THESE FEATURES AMPLIFY...A LARGE CUTOFF LOW NOW APPEARS CERTAIN TO DEVELOP. THE BIG QUESTION IS...WHERE EXACTLY WILL IT DEVELOP AND ONCE IT DOES HOW WILL IT MOVE. 12Z GFS WAS STILL THE ODD MODEL OUT...MOVING THE LOW MUCH FURTHER W THAN ECMWF...WITH NAM KIND OF IN THE MIDDLE. 18Z RUN OF THE NAM IS NOW FURTHER W THAN 12Z RUN AND BEGINNING TO LOOK LIKE IT/S BEGINNING TO FAVOR THE GFS POSITION. ANY SCENARIO YOU BUY INTO AT THIS TIME WOULD BE DRY FOR OUR CWA. THE MAIN STICKING POINT WOULD BE HOW MUCH COOLING TO BRING INTO THE CWA AND HOW FAR W TO TAKE IT. 12Z MEXMOS WAS GIVING A FULL 10 DEG F OF COOLING ON TUESDAY FOR KPHX. FOR NOW...OPTED TO NOT GO THAT COOL...MORE ON THE ORDER OF 5 DEGREES. BUT...IF THE GFS DOES VERIFY BEST...WE COULD ONLY SEE MAX TEMPS NEAR 90 OR SO ON WEDNESDAY. TIME WILL TELL. COULD ALSO BE SOME BREEZES IN THE MORNINGS AS BACKDOOR COOL FRONT GIVES A MODERATE E/W NEAR-SURFACE PRESSURE GRADIENT. LATTER PART OF THE EXTENDED WAS LEFT ALONE FOR NOW...BUT MID SHIFT MAY NEED TO MAKE SOME MAJOR MODIFICATIONS TEMP-WISE IF ECMWF BEGINS TO SING THE GFS TUNE...IE WE WOULD NEED TO GO MUCH COOLER WITH OUR TEMPS WED AND THEREAFTER. && .AVIATION... KPHX AND KIWA... MOST SHOWERS AND THUNDERSTORMS ARE EXPECTED TO STAY BEYOND 30 NM TO THE NORTH AND EAST OF KPHX THIS AFTERNOON AND EARLY EVENING...BUT ISOLATED STORMS MAY DEVELOP BETWEEN 20 AND 30 NM TO THE NORTH AND EAST OF KPHX AND 10 NM NORTH AND EAST OF KIWA. THUS...HAVE CONTINUED TO INCLUDE A CB GROUP IN THE TAFS. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS...SOME OF THEM QUITE STRONG...ARE EXPECTED TO THE EAST OF KPHX FROM ABOUT 35 NM AND BEYOND THIS AFTERNOON AND EARLY EVENING WITH TOPS TO OVER 40 THOUSAND FEET. TYPICAL DIURNAL WINDS ARE EXPECTED WITH WINDS GENERALLY FROM THE WEST THIS AFTERNOON AND EARLY EVENING...BUT ARE EXPECTED TO SWITCH FROM THE SOUTHEAST AND EAST EARLIER THAN USUAL AFTER 0300 GMT THIS EVENING AND CONTINUE THROUGH SUNDAY MORNING...THEN SWITCH FROM THE SOUTHWEST AND WEST AGAIN AFTER 1800 OR 1900 GMT SUNDAY. KIPL AND KBLH... TYPICAL DIURNAL WINDS AND MOSTLY CLEAR SKIES ARE EXPECTED THIS WEEKEND. AVIATION DISCUSSION NOT UPDATED FOR AMENDED TAFS. && .FIRE WEATHER... MONDAY THROUGH FRIDAY... AS A STRONG HIGH PRESSURE SYSTEM BUILDS OVER THE WEST COAST MONDAY...A COLD FRONT WILL MOVE SOUTH FROM NV/UT INTO AZ. AT THIS TIME IT APPEARS THAT THE BREEZY WINDS AND DRIER AIR ASSOCIATED WITH THE FRONT WILL ARRIVE LATE MONDAY INTO TUESDAY. SIGNIFICANT DRYING IS LIKELY BEHIND THE FRONT...WITH MIN RH VALUES FALLING WELL BELOW 15 PERCENT. BREEZY EASTERLY WINDS WILL BE POSSIBLE TUESDAY AND WEDNESDAY...DECREASING IN INTENSITY THE SUBSEQUENT DAYS. AFTER WEDNESDAY RH VALUES WILL SLOWLY TREND UPWARD. AFTER DROPPING FROM MONDAY TO TUESDAY...TEMPERATURES WILL SHOW LITTLE VARIATION THROUGH THE WEEKEND. && .PSR WATCHES/WARNINGS/ADVISORIES... AZ...NONE. CA...NONE. && NATIONAL WEATHER SERVICE PHOENIX IS ON THE INTERNET AT WEATHER.GOV/PHOENIX DISCUSSION...ESTLE AVIATION...ELLIS FIRE WEATHER...INIGUEZ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 602 AM MST SAT SEP 19 2009 AZZ021>023-028-201315- WEST CENTRAL DESERTS-NORTHWEST MARICOPA COUNTY-GREATER PHOENIX AREA- NORTHWEST AND NORTH CENTRAL PINAL COUNTY- 602 AM MST SAT SEP 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH-CENTRAL ARIZONA AND WEST-CENTRAL ARIZONA. .DAY ONE...TODAY AND TONIGHT A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IS EXPECTED. IN ADDITION TO LIGHTNING...THE MAIN THREAT FROM ANY THUNDERSTORMS THAT DEVELOP WILL BE SUDDEN STRONG WINDS. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO WEATHER HAZARDS EXPECTED. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ024-201315- SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS- 602 AM MST SAT SEP 19 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST-CENTRAL ARIZONA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THIS MORNING WITH SCATTERED SHOWERS AND THUNDERSTORMS DEVELOPING IN THE AFTERNOON AND EVENING. IN ADDITION TO LIGHTNING...THE STORMS WILL BE CAPABLE OF PRODUCING SUDDEN STRONG WINDS AND BRIEF HEAVY RAIN. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO WEATHER HAZARDS EXPECTED. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ020-025>027-CAZ030>033-201315- LOWER COLORADO RIVER VALLEY AZ-YUMA/MARTINEZ LAKE AND VICINITY- SOUTHWEST DESERTS-SOUTHWEST MARICOPA COUNTY- JOSHUA TREE NATIONAL PARK-LOWER COLORADO RIVER VALLEY CA- RIVERSIDE COUNTY/EASTERN DESERTS-IMPERIAL COUNTY- 602 AM MST SAT SEP 19 2009 /602 AM PDT SAT SEP 19 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWEST ARIZONA...EXTREME WEST-CENTRAL ARIZONA...SOUTH-CENTRAL ARIZONA... SOUTHWEST ARIZONA...EXTREME SOUTHEAST CALIFORNIA AND SOUTHEAST CALIFORNIA. .DAY ONE...TODAY AND TONIGHT NO WEATHER HAZARDS EXPECTED. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO WEATHER HAZARDS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NECESSARY. NATIONAL WEATHER SERVICE PHOENIX IS ON THE INTERNET AT WEATHER.GOV/PHOENIX AJ
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 217 PM MST SAT SEP 19 2009 AZZ024-192200- GILA AZ- 217 PM MST SAT SEP 19 2009 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... CENTRAL GILA COUNTY IN EAST CENTRAL ARIZONA UNTIL 300 PM MST AT 217 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 14 MILES WEST OF HILLTOP ALONG HIGHWAY 60...MOVING EAST AT 5 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... RURAL CENTRAL GILA COUNTY... LAT...LON 3373 11048 3349 11042 3346 11074 3364 11078 TIME...MOT...LOC 2117Z 257DEG 4KT 3357 11066 HIRSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 230 PM MST SAT SEP 19 2009 AZZ024-192215- MARICOPA AZ- 230 PM MST SAT SEP 19 2009 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA UNTIL 315 PM MST AT 229 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 11 MILES NORTHEAST OF CAMP CREEK...MOVING SOUTH AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... RURAL NORTHEASTERN MARICOPA COUNTY EAST OF CAMP CREEK... LAT...LON 3379 11147 3375 11176 3402 11178 3402 11154 TIME...MOT...LOC 2130Z 351DEG 9KT 3400 11166 HIRSCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PHOENIX AZ 243 PM MST SAT SEP 19 2009 AZZ024-192230- MARICOPA AZ- 243 PM MST SAT SEP 19 2009 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTHEASTERN MARICOPA COUNTY IN SOUTH CENTRAL ARIZONA UNTIL 330 PM MST AT 239 PM MST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 10 MILES NORTHEAST OF CAMP CREEK...MOVING SOUTH AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. LIGHTNING WELL OUT AHEAD OF THE STORM IS ALSO POSSIBLE NEAR BARTLETT LAKE. LOCATIONS IMPACTED INCLUDE... BARTLETT LAKE... SUNFLOWER... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 3376 11141 3369 11169 3402 11179 3402 11155 TIME...MOT...LOC 2140Z 341DEG 11KT 3397 11165 HIRSCH
The Phoenix radar (KIWA), 66 km away, was scanning. The volume nearest the first event began at 22:21 UTC.
1 heavy rain, 1 lightning. Local standard time, as filed.
Heavy rain with thunderstorms struck Roosevelt late in the afternoon. One report included 1.47 inches in just 48 minutes at Roosevelt dam.
Lake patrol at Roosevelt Lake reported a lightning strike that caused a brief power outage at the marina. A small shed was also damaged.
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: 192238, 192239.