Arizona, 2021Dust Storm and Hail in Arizona, July 10, 2021
July 10, 2021 · NWS PSR · 33 events in 8 counties and zones
With upper level high pressure centered near Las Vegas, Nevada this promoted increased northeasterly flow through central and southern Arizona. 30-35 kts of 0-6 km bulk shear was analyzed over south-central Arizona under this regime and with 1000-1500 J/kg of MLCAPE, organized strong to severe thunderstorms developed over the Mogollon Rim in the afternoon and spread through the lower deserts of…
Every event with a place to put it; 8 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
Open the live radar over this ground
- Deaths
- 0
- Injuries
- 0
- Property damage
- $432,000
- Crop damage
- None recorded
- Events
- 33
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.
With upper level high pressure centered near Las Vegas, Nevada this promoted increased northeasterly flow through central and southern Arizona. 30-35 kts of 0-6 km bulk shear was analyzed over south-central Arizona under this regime and with 1000-1500 J/kg of MLCAPE, organized strong to severe thunderstorms developed over the Mogollon Rim in the afternoon and spread through the lower deserts of south-central Arizona through the evening hours. Two severe multi-cellular clusters progressed off the high terrain into the lower deserts of Pinal and Maricopa counties and eventually merged together in northwest Pinal county before continuing southwest. The severe storms produced widespread 40+ mph wind gusts with many areas of 60-70 mph gusts. There were numerous toppled trees, downed power lines, damaged roofs, and other infrastructure and property damage as a result of the severe winds. Over 35,000 customers across Phoenix also lost power. The severe winds also produced a dust storm out ahead of the storms with widespread dense blowing dust pushing west through northern Pinal and southwest Maricopa counties. There was also an area of dense blowing dust reported in the North Phoenix foothills with the northern multi-cell cluster. This was the second day in a row with severe winds moving through some of the same areas.
What forecasters said that day
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 Jul 10, 5:33 PM MST, 1 hour 12 minutes earlier.
Area forecast discussion, Jul 10, 5:33 PM MST, 1 hour 12 minutes before
Area Forecast Discussion
National Weather Service Phoenix AZ
533 PM MST Sat Jul 10 2021
.UPDATE...Updated Aviation discussion.
&&
.SYNOPSIS...
Well above normal temperatures will continue through the weekend
posing a high risk for health impacts across lower elevation
communities. Moisture levels will remain elevated enough for a
threat of afternoon and evening showers and storms, primarily from
Phoenix eastward. A shift in the weather pattern is expected next
week with temperatures cooling and increased chances for showers and
thunderstorms.
&&
.DISCUSSION...
A 595dm high pressure system was sitting over NW Arizona this
afternoon while a nearly stationary low pressure trough was spinning
over eastern Chihuahua. Objective analysis shows 25-30kt of 500mb
easterly flow between these two features with jet level dynamics
showing a divergent signature over southern Arizona. 12Z sounding
data sampled an extremely warm atmosphere with 700mb temperatures
of +18C and 850mb temperatures greater than +26C. This data is
nearly identical to Friday morning resulting in afternoon readings
well in excess of 110F at lower elevations, and continuation of the
Excessive Heat Warning through Sunday/Monday.
While somewhat difficult to analyze, it appears there may be a small
shortwave in the flow over SW colorado this afternoon which could
help maintain deep convection forming over the mountains. Positives
for an extended period of stronger thunderstorms today include good
dynamics and steering flow, unusually steep midlevel lapse rates and
high values of DCape (> 1500 J/kg) coincident with high MLCape (near
2000 J/kg), and a good pool of available boundary layer moisture (12-
13 g/kg mixing ratios). Negatives include notable drying just above
the boundary layer in a 700-500mb layer and substantial CinH (>100
J/kg) at lower elevations that will need to be overcome to maintain
convective progress.
Despite the negatives, the majority of CAMs develop robust
convection over mountains of east central Arizona with strong cold
pools and outflow boundaries racing eastward to lower elevations of
Maricopa/Pinal/Pima counties. HREF probabilities shows a 50-70%
chance of 35mph winds bursting across the southeastern parts of the
CWA this evening, and given the shear parameters, SPC highlights at
least a 15% chance of wind gusts in excess of 58 mph. Much like last
night, storms forming immediately along and behind the outflow would
reinforce the winds and enhanced flow aloft may exacerbate the gust
potential, and a small severe thunderstorm watch from SPC would be
possible. Also similar to last night, CAMs suggest storms along and
behind the outflow coalescing into a decaying MCS through the
southern parts of the forecast area. Given instability and dynamics,
its certainly possible strong winds and dust could extend well out
in advance of any persistent storms during the late
evening/overnight. Rainfall will be more scarce with WPC guidance
only showing a few patches of accumulations over 1/4 inch and most
areas with nothing while NBM output shows less than a 10% chance of
getting 0.10 inches.
Sunday will likely be more convectively inactive as NBM POPs barely
touch 25% over high terrain of Gila County and 15% around the
Phoenix metro. HREF data shows thunderstorm clusters and probable
MCS development focused over SE AZ/SW NM in association with a
subtle expansion and southern shift to the 500 mb high and shortwave
activity moved out of the forecast area replaced with subsident
dynamics. HREF probabilities show less than a 30% chance of getting
35 mph into lower elevations Sunday afternoon and evening with an
even lower chance of actually getting rain.
&&
.PREVIOUS DISCUSSION...
Monday will be a transition day as the shortwave over the Central
Rockies departs and the Great Basin anti-cyclone expands eastward
but becomes much more diffuse, weaker, and ill-defined. For Tuesday
through Friday, mid-level flow remains generally from the northeast
but speeds notably decrease. A weak shear access will likely remain
in place, acting as a source of mid-level vorticity. Boundary layer
moisture will increase (possibly quite a bit), helping to push
temperatures down but also resulting in increasing CAPE values. The
EPS-based EFI CAPE shows CAPE values in the upper portions of the
model's climate for Tue-Thu. All-in-all, another burst of convective
activity appears likely for much of Arizona.
Given the weakening winds, would anticipate the flash flooding
potential to be increasing and the widespread wind threat to
decrease (though localized downbursts are always a threat with our
convection). Further west, temperatures will also moderate across
southeast California and southwest Arizona but excessive convective
inhibition will likely mean not much in the way of precipitation.
That said, if PWAT values do end up pushing above 2", desert
mountains could certainly activate diurnal convection. It is also
possible for late night convective remnants to make there way toward
Yuma and Blythe, but for now with the weaker steering flow that
seems less likely.
&&
.AVIATION...Updated at 0030Z.
South-Central Arizona including KPHX, KIWA, KSDL, and KDVT:
There is an increased threat of severe weather this evening
across the Phoenix area and consequently a Severe Thunderstorm
Watch has been issued. A line of storms across the Mogollon Rim
will continue marching southwestward towards the Valley. This line
of storms should evolve into a larger cluster as it approaches
the lower deserts this evening. Wind gusts exceeding 60 mph will
be possible at all terminals, but appear most likely at KIWA and
KPHX. The probability of a strong outflow boundary with an abrupt
wind switch containing an easterly component is roughly 70
percent.
Visibilities will generally remain above 6 SM. However, there is
a 50 percent chance of a dust storm with visibilities below 1 SM.
Most likely timing of the blowing dust appears to be between 9 pm
and 11 pm, and reduced visibilities could last up to an hour.
Meanwhile, ceilings will generally not be a concern, but may
briefly lower to 8k ft in heavy rain before conditions improve
after midnight.
Southeast California/Southwest Arizona including KIPL and KBLH:
Density altitude concerns and the potential for blowing dust and
isolated thunderstorm impacts over southwest Arizona late tonight
will be the main aviation impacts through Sunday morning. Winds at
KIPL will favor a southeast to southwest component through the
period, whereas winds at KBLH will favor a southerly component.
Some afternoon/evening breeziness with 20-25 knot gusts will be
possible with FEW-SCT cloud decks generally remaining above 15
kft. Density altitude impacts will be possible this afternoon,
particularly at KBLH where several hours of 115-119 deg F
temperatures are expected. Very isolated thunderstorms and outflows
capable of producing blowing dust may push into southwest Arizona
this evening, but should generally weaken as they encounter
strong midlevel stability.
&&
.FIRE WEATHER...
Tuesday through Saturday:
Temperatures next week will hover near to slightly below the
seasonal average as moisture levels remain favorably high. This will
result in frequent afternoon and evening thunderstorm chances (~60%
daily) over eastern districts with lesser chances (<20%) in western
districts. Lightning, strong, gusty and erratic winds, and very
heavy rainfall will be common throughout the week. Significant
flooding may be experienced on previously burned areas of Gila
County. Minimum afternoon humidity levels will mostly fall into a 20-
40% range in eastern districts and 15-25% range further west.
Overnight recovery will range from as much as 75-100% in mountainous
areas of eastern Arizona to only 25% in SE California higher
terrain. Aside from thunderstorm influenced winds, speeds will be
fairly light under 20 mph.
&&
.SPOTTER INFORMATION STATEMENT...
Spotters should follow standard reporting procedures.
&&
.PSR WATCHES/WARNINGS/ADVISORIES...
AZ...Excessive Heat Warning until 8 PM MST Sunday for AZZ530-532>534-
537-538-540>544-546-548>551.
Blowing Dust Advisory until 11 PM MST this evening for AZZ539-
550-551-553-554-559.
CA...Excessive Heat Warning until 8 PM PDT Sunday for CAZ569.
Excessive Heat Warning until 8 PM PDT Monday for CAZ560>563-
566>568-570.
&&
DISCUSSION...18/Iniguez
AVIATION...Hirsch
FIRE WEATHER...18In the hours before
Special weather statement, Jul 10, 3:15 PM MST, 3 hours 30 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
315 PM MST Sat Jul 10 2021
AZZ560-563-102300-
Southeast Gila County AZ-San Carlos AZ-
315 PM MST Sat Jul 10 2021
...SIGNIFICANT WEATHER ADVISORY FOR GILA COUNTY UNTIL 400 PM MST...
At 315 PM MST, Doppler radar was tracking a strong thunderstorm 7
miles north of Sawmill, or 33 miles northeast of Globe, moving
southwest at 20 mph.
Pea size hail and wind gusts up to 50 mph will be possible with this
storm.
Locations impacted include...
Hilltop and Sawmill.
This includes US Highway 60 between mile markers 269 and 297.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3368 11022 3347 11058 3356 11064 3381 11067
3384 11059 3384 11053 3382 11050 3383 11033
3380 11030
TIME...MOT...LOC 2215Z 061DEG 15KT 3373 11035
SDBSpecial weather statement, Jul 10, 5:37 PM MST, 1 hour 8 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
537 PM MST Sat Jul 10 2021
AZZ560-563-110115-
Southeast Gila County AZ-San Carlos AZ-
537 PM MST Sat Jul 10 2021
...SIGNIFICANT WEATHER ADVISORY FOR GILA COUNTY UNTIL 615 PM MST...
At 536 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 17 miles southeast of Young to 11 miles
southwest of Carrizo to 10 miles south of Cedar Creek. Movement was
southwest at 30 mph.
Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Locations impacted include...
Hilltop and Sawmill.
This includes US Highway 60 between mile markers 261 and 297.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
A Severe Thunderstorm Watch remains in effect until midnight MST for
east central Arizona.
LAT...LON 3347 11017 3344 11020 3344 11032 3339 11042
3348 11070 3366 11089 3368 11084 3366 11078
3379 11068 3385 11056 3382 11050 3383 11033
3360 11004 3360 11000 3346 11000
TIME...MOT...LOC 0036Z 035DEG 27KT 3398 11068 3387 11042 3375 11017
SDBLocal storm report, Jul 10, 5:52 PM MST, 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
552 PM MST SAT JUL 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0957 PM TSTM WND DMG 7 NW FLORENCE JUNCTION 33.33N 111.43W
07/09/2021 PINAL AZ UTILITY COMPANY
***DELAYED REPORT***28 DISTRIBUTION POLES
DOWN ALONG US HWY 60 AT MP 206. PEAK WINDS
ESTIMATED AT 60-65 MPH FROM 9:57-10:04 P.M.
PER TPHX RADAR.
&&
LJHSpecial weather statement, Jul 10, 6:06 PM MST, 39 minutes before
Special Weather Statement
National Weather Service Phoenix AZ
606 PM MST Sat Jul 10 2021
AZZ541-545-547-552-556>558-560>563-110145-
Southeast Gila County AZ-New River Mesa AZ-Mazatzal Mountains AZ-
Tonto Basin AZ-Cave Creek/New River AZ-San Carlos AZ-
Dripping Springs AZ-Globe/Miami AZ-Superior AZ-
Rio Verde/Salt River AZ-Pinal/Superstition Mountains AZ-
606 PM MST Sat Jul 10 2021
...SIGNIFICANT WEATHER ADVISORY FOR GILA...MARICOPA AND PINAL
COUNTIES UNTIL 645 PM MST...
At 606 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from near Rye to 14 miles northeast of Roosevelt to
11 miles west of Hilltop. Movement was southwest at 30 mph.
Penny size hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Locations impacted include...
Scottsdale, Globe, Superior, Sugarloaf Mountain, Sycamore Creek,
Ballantine Trailhead, Roosevelt, Round Valley, Sunflower, San Carlos,
Carefree, Miami, Cutter, Roosevelt Dam, Top-Of-The-World, Canyon
Lake, Central Heights-Midland City, Tonto National Monument, Four
Peaks and Desert Mountain.
This includes the following highways...
US Highway 60 between mile markers 223 and 276.
AZ Route 87 between mile markers 197 and 229.
AZ Route 70 between mile markers 253 and 271.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until midnight MST for
south central, southeastern and east central Arizona.
LAT...LON 3338 11045 3329 11046 3320 11040 3315 11063
3309 11070 3312 11086 3324 11094 3318 11105
3385 11192 3401 11177 3401 11143 3380 11115
3376 11099 3364 11092 3368 11084 3366 11078
3373 11071 3343 11030
TIME...MOT...LOC 0106Z 045DEG 27KT 3405 11141 3386 11102 3368 11060
SDBLocal storm report, Jul 10, 6:24 PM MST, 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
624 PM MST SAT JUL 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1032 PM TSTM WND DMG 2 NNW HIGLEY 33.34N 111.74W
07/09/2021 MARICOPA AZ BROADCAST MEDIA
***DELAYED REPORT***LARGE TREE UPROOTED AT
PARK NEAR GREENFIELD AND WARNER. WINDS
ESTIMATED AT 55-60 MPH BASED ON RADAR,
NEARBY OBSERVATIONS, AND OTHER DAMAGE.
&&
LJHLocal storm report, Jul 10, 6:42 PM MST, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
642 PM MST SAT JUL 10 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1010 PM TSTM WND DMG 9 SE QUEEN CREEK 33.13N 111.55W
07/09/2021 PINAL AZ TRAINED SPOTTER
***DELAYED REPORT***...NUMEROUS LARGE TREES
1-2 FEET IN DIAMETER UPROOTED NEAR AMIRA
PARK AND IN JOHNSON RANCH. WINDS ESTIMATED
AT 60 MPH WITH TIMING BASED ON RADAR.
&&
LJHEvent by event
24 thunderstorm wind, 8 dust storm, 1 hail. Local standard time, as filed.
Thunderstorm Wind, Gila
- When
- July 10, 6:45 PM MST
- Where
- Gila County, 1.5 mi NNE of Radium
- Measured
- 53 kt (61 mph) estimated gust
- Property damage
- $500
- Reported by
- Trained Spotter
- Coordinates
- 33.450, -110.770
Cement tiles were blown off a roof, and a grill, propane tank, and heavy iron table were blown over in a severe warned thunderstorm. A 61 mph wind gust was measured by a home weather station at this location. Timing based on radar. No injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 6:50 PM MST
- Where
- Maricopa County, 13.25 mi ENE of Carefree
- Measured
- 72 kt (83 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.980, -111.720
A SRP mesonet station at Horseshoe Dam measured an 83 mph wind gust.
Thunderstorm Wind, Gila
- When
- July 10, 6:55 PM MST
- Where
- Gila County, 2.15 mi SSE of Roosevelt
- Measured
- 55 kt (63 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.640, -111.120
Mesonet station AU919 at 2 miles SSE of Roosevelt measured a 63 mph wind gust.
Thunderstorm Wind, Maricopa
- When
- July 10, 6:55 PM MST
- Where
- Maricopa County, 13.77 mi ENE of Carefree
- Measured
- 59 kt (68 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.980, -111.710
Mesonet station SRP19 at 16.2 miles NE of Carefree measured a 68 mph wind gust.
Dust Storm, Cave Creek/New River
- When
- July 10, 7:15 PM MST to 7:25 PM MST
- Where
- Cave Creek/New River forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
Visibility fell to less than 500 feet briefly in blowing dust from a thunderstorm outflow near Long Cove Way and Pumpkin Ridge Drive in Anthem. No damages or injuries were reported.
Dust Storm, Cave Creek/New River
- When
- July 10, 7:20 PM MST to 7:30 PM MST
- Where
- Cave Creek/New River forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
Report of visibility briefly falling to near zero miles in blowing dust from a thunderstorm outflow near Carefree Highway and 3rd Street in North Phoenix. No damages or injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 7:30 PM MST
- Where
- Maricopa County, 9.81 mi WSW of Sunflower
- Measured
- 52 kt (60 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.820, -111.630
Mesonet station SRP20 at Bartlett Dam measured a 60 mph wind gust.
Dust Storm, Northwest Pinal County
- When
- July 10, 7:40 PM MST to 7:55 PM MST
- Where
- Northwest Pinal County forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 32.904, -111.345 (the zone’s center; the record gives no point)
A trained spotter reported high winds and that visibility fell below 1/4 mile in blowing dust with a strong thunderstorm outflow boundary near the San Tan Valley. No damages or injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 7:40 PM MST
- Where
- Maricopa County, 7.19 mi WSW of Cave Creek
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $1,000
- Reported by
- Trained Spotter
- Coordinates
- 33.800, -112.070
A 15-20 foot long section of a concrete brick wall was blown over from strong winds near Carefree Highway and 7th Street in North Phoenix during a severe warned thunderstorm. Wind gusts were estimated around 55-65 mph. Timing estimated from radar. No injuries reported.
Thunderstorm Wind, Pinal
- When
- July 10, 7:40 PM MST
- Where
- Pinal County, 4.1 mi N of Magma
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $40,000
- Reported by
- Public
- Coordinates
- 33.189, -111.508
Numerous social media photos and reports of significant damage the the Skyline RV Resort, east of San Tan, due to strong thunderstorm winds. Photos show awning, roof, and side panel damage to a few mobile homes. The number of RVs and mobile homes damaged is unknown. An awning and a shed for one home were destroyed, along with a broken window, and a large portion of metal roof blew off from another. A few street signs were bent in half in the community. There was also a photo of a power pole in the area that snapped near the base of the pole and fell. Power was knocked out to many customers in the area. Winds were estimated around 60-65 mph. Timing estimated from radar. No injuries reported.
Thunderstorm Wind, Pinal
- When
- July 10, 7:45 PM MST
- Where
- Pinal County, 2.15 mi NNE of Magma
- Measured
- 51 kt (59 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.160, -111.490
Mesonet station SRP22 at 10.9 miles NW of Florence measured a 59 mph wind gust.
Thunderstorm Wind, Pinal
- When
- July 10, 7:46 PM MST
- Where
- Pinal County, 4.31 mi WNW of Magma
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $40,000
- Reported by
- Trained Spotter
- Coordinates
- 33.160, -111.565
Nearly 40 trees were uprooted around the Johnson Ranch subdivision in San Tan Valley due to strong winds during a severe warned thunderstorm. Some trees reportedly fell on roofs, fences, and concrete walls with unknown degrees of damage. Minor roof damage was also reported. In a separate report, at an unspecified location in San Tan Valley, photos show strong winds peeled up a portion of a residential roof and a large section of a bedroom ceiling collapsed. Winds were estimated around 55-65 mph. Timing based on radar. No injuries reported.
Thunderstorm Wind, Pinal
- When
- July 10, 7:47 PM MST
- Where
- Pinal County, 5.64 mi NNE of Bapchule
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $30,000
- Reported by
- Broadcast Media
- Coordinates
- 33.170, -111.600
Significant damage to a dog sanctuary near Phillips and Royce Roads in San Tan Valley due to estimated 55 to 65 mph wind gusts from a severe warned thunderstorm. A few couple hundred pound dog sheds were destroyed and one fell over and injured the paw of one of the dogs, named Chuckles, requiring surgery. Timing estimated from radar.
Thunderstorm Wind, Maricopa
- When
- July 10, 7:57 PM MST
- Where
- Maricopa County, 0.9 mi SW of Desert Sands
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $800
- Reported by
- Trained Spotter
- Coordinates
- 33.390, -111.680
Multiple large trees snapped or blown over in strong winds during a severe warned thunderstorm around the Superstition Springs Center near Power Road and Southern Avenue. Winds estimated around 55-60 mph. Timing estimated from radar. No injuries reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:00 PM MST
- Where
- Maricopa County, 1.15 mi E of (Chd)williams Afb
- Measured
- 52 kt (60 mph) measured gust
- Reported by
- AWOS
- Coordinates
- 33.300, -111.650
AWOS at Phoenix-Mesa Gateway airport (KIWA) measured a 60 mph wind gust.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:00 PM MST
- Where
- Maricopa County, 2.37 mi NNW of Apache Wells
- Measured
- 58 kt (67 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.510, -111.690
Mesonet station SRP10 at 6.5 miles N of East Mesa measured a 67 mph wind gust.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:00 PM MST to 8:15 PM MST
- Where
- Maricopa County, 3.24 mi WSW of Sunnyslope to 3.31 mi WNW of Sunnyslope
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $200,000
- Reported by
- Broadcast Media
- Coordinates
- 33.568, -112.134
Multiple photos and videos on social media and reports from broadcast media of at least 14 downed utility power poles along 35th Avenue between Dunlap Avenue and Cactus Road in Phoenix due to strong winds from a severe warned thunderstorm. The downed poles and lines also knocked over street signs and street lamps, disrupted traffic, and caused a power outage for the area that took more than a day to be restored. Additionally, several large trees were uprooted or snapped in and around Cortez Park at 35th Ave and Dunlap Ave and a metal carport reportedly blew more than a block away near 35th Ave and Peoria Ave. Wind gusts were estimated around 55-65 mph. Timing estimated from radar. No injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:01 PM MST
- Where
- Maricopa County, 4.05 mi W of Chandler Hgts
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $40,000
- Reported by
- Law Enforcement
- Coordinates
- 33.220, -111.750
Gilbert Police closed Riggs Road between Val Vista Drive and Adora Boulevard due to downed powerlines. Winds were estimated around 60 mph and timing was estimated from radar. No injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:06 PM MST
- Where
- Maricopa County, Dreamland Villa
- Measured
- 55 kt (63 mph) measured gust
- Reported by
- AWOS
- Coordinates
- 33.470, -111.720
AWOS at Mesa Falcon Field (KFFZ) measured a 63 mph wind gust.
Dust Storm, East Valley
- When
- July 10, 8:10 PM MST to 8:35 PM MST
- Where
- East Valley forecast zone
- Reported by
- Trained Spotter
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
Visibility briefly fell to 1/2 mile in blowing dust from a strong thunderstorm outflow boundary near Warner Road and Cooper Road in Gilbert. Visibility also fell to approximately 1/4 mile in blowing dust near US-60 and Highway-87. No damages or injuries were reported.
Thunderstorm Wind, Pinal
- When
- July 10, 8:10 PM MST
- Where
- Pinal County, 4.16 mi SW of Santan
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $30,000
- Reported by
- Department of Highways
- Coordinates
- 33.130, -111.840
Multiple wooden power lines down due to strong thunderstorm winds on SR-587 near Nelson Road, leading to the closure of SR-587 between I-10 and Indian Route 68. Wind speeds estimated around 60 mph and timing estimated from radar. No injuries reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:10 PM MST
- Where
- Maricopa County, 1.51 mi NNE of Nortons Corner
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $8,000
- Reported by
- Law Enforcement
- Coordinates
- 33.321, -111.773
Gilbert Police reported southbound lanes on Lindsay Road at Ray Road were blocked due to a downed power pole as a result of strong winds. Winds estimated around 60 mph and timing estimated from radar. No injuries reported.
Hail, Maricopa
- When
- July 10, 8:15 PM MST
- Where
- Maricopa County, 0.58 mi W of Queen Creek
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 33.250, -111.640
Video on social media showed hail of various sizes falling in Queen Creek near Ocotillo Rd. with the largest hail stones estimated by the user at 1 inch diameter. No damages or injuries were reported.
Dust Storm, Northwest Pinal County
- When
- July 10, 8:15 PM MST to 8:35 PM MST
- Where
- Northwest Pinal County forecast zone
- Reported by
- Storm Chaser
- Coordinates
- 32.904, -111.345 (the zone’s center; the record gives no point)
A photo on social media showed near zero visibility from blowing dust near I-8 and Trekel Road in Casa Grande, generated by a strong thunderstorm outflow boundary with observed wind gusts up to 60-65 mph. Another social media post showed less than 1/4 mile visibility in nearby Arizona City. No damage of injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:15 PM MST
- Where
- Maricopa County, 4.26 mi WNW of Sunnyslope
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $15,000
- Reported by
- Broadcast Media
- Coordinates
- 33.600, -112.150
Video on social media shows the roof of a residential home was partially torn off due to strong thunderstorm winds near 43rd Avenue and Cactus Road. Winds estimated around 60 mph and timing estimated from radar. No injuries reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 8:15 PM MST
- Where
- Maricopa County, 3.4 mi W of Sunnyslope
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $25,000
- Reported by
- Broadcast Media
- Coordinates
- 33.584, -112.139
Broadcast report from local media showed a carport ripped away from a residence near Sahuaro Drive and 37th Drive due to strong winds in a severe warned thunderstorm. The carport flew into an alley behind the residence, knocking over a cinderblock wall and shattering the window of a residence on the other side of the alley. Winds were estimated around 55-65 mph and timing was estimated from radar. No injuries reported.
Thunderstorm Wind, Pinal
- When
- July 10, 8:35 PM MST
- Where
- Pinal County, 0.9 mi NE of Bon
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- AWOS
- Coordinates
- 32.990, -111.920
AWOS at Ak-Chin Regional Airport (KA39) measured a 60 mph wind gust.
Thunderstorm Wind, Pinal
- When
- July 10, 8:40 PM MST
- Where
- Pinal County, 5.33 mi NW of Lirim
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $2,000
- Reported by
- Trained Spotter
- Coordinates
- 33.070, -112.050
The top half of a 20 foot vertical antenna mast was toppled over in strong thunderstorm winds. Multiple downed trees were also reported across the town of Maricopa. Winds were estimated around 55-65 mph. Timing estimated from radar.
Dust Storm, Sonoran Desert Natl Monument
- When
- July 10, 8:53 PM MST to 9:10 PM MST
- Where
- Sonoran Desert Natl Monument forecast zone
- Reported by
- Storm Chaser
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
A photo on social media showed a large wall of dust moving west along I-8 near Vekol Road exit. Estimated visibility within the dust storm was less than 1/4 mile. No damage or injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 9:14 PM MST
- Where
- Maricopa County, 1.87 mi ESE of Mobile
- Measured
- 56 kt (64 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 33.040, -112.240
Mesonet station MAMO at 2.2 miles SE of Mobile measured a 64 mph wind gust.
Dust Storm, Gila Bend
- When
- July 10, 9:15 PM MST to 9:30 PM MST
- Where
- Gila Bend forecast zone
- Reported by
- Storm Chaser
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
A photo on social media taken near mile post 118 on I-8 showed a large wall of dust/haboob moving west into the Gila Bend area. Visibility in the blowing dust was estimated less than 1/2 mile. No damage or injuries were reported.
Thunderstorm Wind, Maricopa
- When
- July 10, 10:03 PM MST
- Where
- Maricopa County, 0.69 mi S of (Gbn)gila Bend Muni
- Measured
- 53 kt (61 mph) measured gust
- Reported by
- AWOS
- Coordinates
- 32.870, -112.720
AWOS at Gila Bend Air Force Auxiliary Field (KGXF) measured a 61 mph wind gust.
Dust Storm, Gila Bend
- When
- July 10, 10:10 PM MST to 10:25 PM MST
- Where
- Gila Bend forecast zone
- Reported by
- Social Media
- Coordinates
- 33.349, -112.491 (the zone’s center; the record gives no point)
A video on social media showed near zero visibility in blowing dust near I-8 and Paloma Road with a strong thunderstorm outflow boundary from the southeast. This was a different outflow boundary than the one that brought a haboob into the Gila bend area an hour earlier. No damage or injuries were reported.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Dust Storm
- Blowing dust that reduced visibility to a quarter mile or less.
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
- Heat in Arizona, July 10, 20212 deaths · 2 events
- Tornado and Damaging Winds in Missouri, July 10, 2021$2.0 million · EF2 · 4 events
- Flash Flooding and Dust Storm in Arizona, July 10, 2021$352,000 · 1 in hail · 19 events
- Tornado and Flash Flooding in Oklahoma, July 10 to 11, 2021$60,000 · EF1 · 20 events
- Flash Flooding and Damaging Winds in Kentucky, July 10 to 11, 2021$202,000 · 56 kt wind · 8 events
- Flash Flooding and Damaging Winds in Arizona, July 10 to 15, 2021$74,000 · 73 kt wind · 9 events
- Flash Flood and Damaging Winds in Mississippi, July 10 to 12, 2021$95,000 · 55 kt wind · 3 events
- Damaging Winds in Virginia, July 10, 2021$48,000 · 60 kt wind · 6 events
- Tornadoes and Flash Flood in Illinois, July 10, 2021EF1 · 7 events
- Tornado and Hail in Arizona, July 10, 2021EF1 · 2 events
- Damaging Winds in Nebraska, July 10, 2021$22,000 · 70 kt wind · 3 events
- Damaging Winds in Illinois, July 10, 2021$19,000 · 65 kt wind · 4 events
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: 975687, 975495, 975497, 975498, 975557, 975558, 975525, 975559, 975688, 975804, 975545, 975801, 975690, 975691, 975511, 975529, 975689, 975692, 975512, 975560, 975693, 975694, 975556, 975562, 975695, 975696, 975513, 975802, 975563, 975547, 975564, 975546, 975565.