Arizona, 2024

Flash Flood and Damaging Wind in Arizona, July 29, 2024

July 29, 2024 · NWS TWC · 2 events in 1 county or zone

An area of thunderstorms resulted in strong winds and areas of flash flooding in southern Cochise County.

Where it happened

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  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
$25,000
Crop damage
None recorded
Events
2

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.

What happened

The episode as NWS TWC wrote it up.

An area of thunderstorms resulted in strong winds and areas of flash flooding in southern Cochise County.

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 Tucson, AZ wrote its last area forecast discussion before the first event at Jul 29, 1:48 PM MST, 3 hours 38 minutes earlier.

Area forecast discussion, Jul 29, 1:48 PM MST, 3 hours 38 minutes before
Area Forecast Discussion
National Weather Service Tucson AZ
148 PM MST Mon Jul 29 2024

.SYNOPSIS...

Daily chances for thunderstorms continue this week. Heavy rainfall
may cause localized flash flooding. Isolated strong wind gusts
will also be possible. High temperatures should rise a few degrees
by late this week.

&&

.DISCUSSION...

Isolated to scattered convection is expected to develop this
afternoon, with greater coverage likelier further south. RAP
guidance indicates richer low level moisture remains in areas
closer to the International Border with higher mixing ratio values
boosting instability across these areas. This is where coverage of
convection today will also be greatest, with the potential for
very heavy rainfall rates. Convective layer wind under 10 knots
will lead to very slow moving thunderstorms again, while the
seasonably moist atmosphere should lead to the very heavy
rainfall rates. While coverage will decrease this evening with
sunset, convective chances may linger through the night as a mid
level low approaches from the Gulf of California. Guidance
indicates an additional draw of mid-level moisture from this low
into southeastern Arizona, which along with the added ascent may
produce additional showers and thunderstorms even through Tuesday
morning.

By Tuesday afternoon, southeastern Arizona is forecast to be on
the wrong side of an impulse ejected through this closed low,
which should create a "lower" grade monsoon day. Continued active
flow from the lingering low however may produce additional
convection overnight into early Wednesday. At this point forecast
slight chances past midnight Tuesday night were kept to Santa Cruz
and Cochise counties, but these may need to be expanded.

Daily chances for thunderstorms continue through the forecast
period this week. The other part of the story will be the building
of a western CONUS ridge, which will warm up high temperatures
across the region. This should bring high temperatures 5 to 7
degrees above normal with moderate Heat Risk levels.

&&

.AVIATION...Valid through 31/00Z.

Isolated to scattered TSRA through 30/02Z. Very heavy rainfall
with isolated strong wind gusts to near 45 kts expected with any
thunderstorm today. An isolated shower can't be ruled out tonight
or early Tuesday morning as well. Otherwise winds generally light
this morning and under 12kts this afternoon. Aviation discussion
not updated for TAF amendments.

&&

.FIRE WEATHER...

Elevated moisture will continue with scattered afternoon and
evening showers and thunderstorms. Each day has the threat of
heavy rain, localized flash flooding and strong gusty outflow
winds. Away from thunderstorms, 20-foot winds will generally be 15
mph or less, with afternoon/early evening gusts to 20-25 mph and
light winds overnight. As high pressure builds late this week,
high temperatures should rise a bit and minimum relative
humidities should fall by a few percentage points.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
None.
&&

Public...Edwards
Aviation...Edwards
Fire Weather....Edwards

Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson

The radar

The Tucson radar (KEMX), 114 km away, was scanning. The volume nearest the first event began at 00:24 UTC.

Open the radar archive at this moment

Event by event

1 thunderstorm wind, 1 flash flood. Local standard time, as filed.

Thunderstorm Wind, Cochise

When
July 29, 5:26 PM MST
Where
Cochise County, 2.36 mi W of Pirtleville
Measured
52 kt (60 mph) estimated gust
Property damage
$5,000
Reported by
Utility Company
Coordinates
31.351, -109.610

Downed power lines causing power outage to roughly 20 people.

Flash Flood, Cochise

When
July 29, 7:15 PM MST to 10:15 PM MST
Where
Cochise County, 2.29 mi SW of Palominas to 7.61 mi SW of Naco
Cause
Heavy Rain
Property damage
$20,000
Reported by
Department of Highways
Coordinates
31.358, -110.150

Numerous reports of flash flooding in the Bisbee area including mud and gravel over much of Brewery Ave making it impassable. Additionally, Green Bush Wash west of Bisbee flowed over roads and private properties. Public also reported approximately 1-3 inches of water flowing over Highway 92.

What these are

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.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Arizona in 2024Every state in 2024This day in weather historyWarnings in Arizona, July 2024

Sources

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: 1190916, 1190944.