Alert archive / Arizona / Flash Flood Warnings in 2026

Flash Flood Warning 155, NWS Tucson, AZ

August 27, 2026Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 27, 2026, 5:51 PM MST for Pima County, Arizona. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 27, 2026, 5:51 PM MST (00:51 UTC)
Expired: Aug 27, 2026, 8:45 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 47 km from the middle of the area, began a volume at 00:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 27, 5:55 PM MST	FLASH FLOOD	5 Wnw Tucson, AZ	Flooding in street.
Aug 27, 6:04 PM MST	FLASH FLOOD	5 Nw Tucson, AZ	Flooding in roadway overtopping curb.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this flash flood warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The text

As transmitted.

757 
WGUS55 KTWC 280051
FFWTWC
AZC019-280345-
/O.NEW.KTWC.FF.W.0155.260828T0051Z-260828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
551 PM MST Thu Aug 27 2026

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  Eastern Pima County in southeastern Arizona...

* Until 845 PM MST.

* At 551 PM MST, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is ongoing or
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Tucson, Davis-Monthan Air Force Base and South Tucson.

This includes Interstate 10 between mile markers 256 and 259...and
between mile markers 261 and 262.

This includes the following Flash Flood Prone Locations...
Stone Ave at Mabel St.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

&&

LAT...LON 3226 11100 3221 11098 3217 11096 3219 11087
      3221 11088 3227 11093

FLASH FLOOD...RADAR INDICATED

$$

DVS

4 follow-up statements

900 
WGUS75 KTWC 280057
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
557 PM MST Thu Aug 27 2026

AZC019-280345-
/O.CON.KTWC.FF.W.0155.000000T0000Z-260828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
557 PM MST Thu Aug 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS
EVENING FOR EASTERN PIMA COUNTY...

At 557 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.5 and 1 inch of rain has
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of creeks and streams, urban
         areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Tucson, Davis-Monthan Air Force Base and South Tucson.

This includes Interstate 10 between mile markers 256 and 259...and
between mile markers 261 and 262.

This includes the following Flash Flood Prone Locations...
Stone Ave at Mabel St.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

&&

LAT...LON 3226 11100 3221 11098 3217 11096 3219 11087
      3221 11088 3227 11093

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

DVS

075 
WGUS75 KTWC 280125
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
625 PM MST Thu Aug 27 2026

AZC019-280345-
/O.CON.KTWC.FF.W.0155.000000T0000Z-260828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
625 PM MST Thu Aug 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS
EVENING FOR EASTERN PIMA COUNTY...

At 625 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.7 and 1.5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of creeks and streams, urban
         areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  South Tucson.

This includes Interstate 10 between mile markers 256 and 259.

This includes the following Flash Flood Prone Locations...
Stone Ave at Mabel St.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

&&

LAT...LON 3226 11100 3221 11098 3219 11097 3221 11090
      3226 11093

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

DVS

149 
WGUS75 KTWC 280202
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
702 PM MST Thu Aug 27 2026

AZC019-280345-
/O.CON.KTWC.FF.W.0155.000000T0000Z-260828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
702 PM MST Thu Aug 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS
EVENING FOR EASTERN PIMA COUNTY...

At 702 PM MST, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 0.7 and 1.5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  South Tucson.

This includes Interstate 10 between mile markers 256 and 259.

This includes the following Flash Flood Prone Locations...
Stone Ave at Mabel St.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Remain alert for flooding even in locations not receiving rain.
Washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

&&

LAT...LON 3226 11100 3221 11098 3219 11097 3220 11094
      3226 11093

FLASH FLOOD...RADAR INDICATED

$$

DVS

483 
WGUS75 KTWC 280347
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
847 PM MST Thu Aug 27 2026

AZC019-280357-
/O.EXP.KTWC.FF.W.0155.000000T0000Z-260828T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
847 PM MST Thu Aug 27 2026

...FLASH FLOOD WARNING HAS EXPIRED FOR EASTERN PIMA COUNTY...

Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

&&

LAT...LON 3226 11100 3221 11098 3219 11097 3220 11094
      3226 11093

$$

DVS

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Aug 27, 2:16 PM MST, 3 hours 35 minutes earlier.

Area forecast discussion, Aug 27, 2:16 PM MST, 3 hours 35 minutes before

Area Forecast Discussion
National Weather Service Tucson AZ
216 PM MST Thu Aug 27 2026

.SYNOPSIS...
Monsoon pattern ramps up as early as today and settles
in through the weekend with daily thunderstorm chances. High
temperatures will remain well above normal through the week with an
Extreme Heat Warning in effect for much of southeast Arizona.
Temperatures are forecast to fall to near normal Sunday through
early next week.

&&

.DISCUSSION...
Currently, storms are beginning to form in the Sky Islands
across Southeastern Arizona. Through this afternoon and evening
storms will move off the terrain into the valleys and move West
to Northwest at 10-15 kts. Main impacts from storms today are
primarily strong outflow winds at 40-60 mph that can loft areas
of blowing dust and reduce visibilities. With this modest storm
motion, flash flooding will be isolated and mainly limited to
backbuilding/training thunderstorms across the area.

Looking at tomorrow, it will all depend on how strong and
widespread the thunderstorm activity we see today. Some CAMs
like the HRRR is more ambitious with scattered thunderstorms
across much of Southeastern Arizona, but if the area is worked
over enough from the activity today, that will keep much of the
stronger storm activity at a minimum. If there are storms,
hazards will be similar to today with the stronger wind gusts,
then flash flooding.

This weekend continues to look more active, but still unclear
which day will be more impactful out of the two days. As the
area of high pressure begins to move east and trough digs down
to our west, this synoptic forcing will allow for longer lived
storms. As the upper level flow shifts SW, ample moisture will
come into the area, increasing PWs to 1.5 inches in Tucson by
Saturday. This increase in moisture will switch the primary
hazard to flash flooding.

The Extreme Heat Warning remains in effect through Saturday with
the hottest temperatures through Friday. Temperatures will lower
to near normal levels Sunday into next week, with perhaps Monday
even coming in slightly below normal.

&&

.AVIATION... Valid through 29/00Z.
FEW-SCT clouds mainly 10k-13k ft for the period with isolated
to scattered SHRA/TSRA between now thru 28/09Z and again aft
28/19Z thru the end of the period. Thunderstorms have the
potential to produce strong wind gusts, but otherwise surface
winds light and terrain driven outside of a few afternoon gusts.
Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...
Isolated to scattered thunderstorms this afternoon, with an
active period expected today through Monday (30 to 70 percent
daily thunderstorm chances). Temperatures will remain well above
normal today with a cooling trend this weekend into early next
week. Minimum relative humidity values mainly 10 to 20 percent
in the valleys and 20 to 30 percent in the mountains through
Friday. Minimum RH values increase to 20 to 40 percent starting
Saturday in valleys and 30 to 50 percent in the mountains. Winds
will generally remain less than 15 mph and terrain driven
through the week.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Extreme Heat Warning until 8 PM MST Saturday for AZZ501>509.

&&

JT

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In the hours before

Local storm report, Aug 27, 2:54 PM MST, 2 hours 57 minutes before

Preliminary Local Storm Report
National Weather Service Tucson AZ
254 PM MST Thu Aug 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0227 PM     Tstm Wnd Gst     6 NE Nogales            31.42N 110.85W
08/27/2026  M52 MPH          Santa Cruz         AZ   ASOS

            KOLS recorded wind gust of 52 mph.

&&

JVT

Local storm report, Aug 27, 3:36 PM MST, 2 hours 15 minutes before

Preliminary Local Storm Report
National Weather Service Tucson AZ
336 PM MST Thu Aug 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0240 PM     Tstm Wnd Gst     12 NW Patagonia         31.68N 110.88W
08/27/2026  M86 MPH          Santa Cruz         AZ   Mesonet

            Mesonet station QHPA3 Hopkins recorded wind
            gust of 86 mph.

&&

JVT

Local storm report, Aug 27, 5:37 PM MST, 14 minutes before

Preliminary Local Storm Report
National Weather Service Tucson AZ
537 PM MST Thu Aug 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     Tstm Wnd Gst     6 SW Tucson             32.13N 110.95W
08/27/2026  M64 MPH          Pima               AZ   ASOS

            ASOS station KTUS Tucson International
            Airport.

&&

DVS

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 27, 5:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Aug 27, 5:35 PM MST	Dust Storm Warning	TWC	Pima	25 min
Aug 27, 5:37 PM MST	Dust Storm Warning	TWC	Pima	53 min
Aug 27, 5:39 PM MST	Severe Thunderstorm Warning	TWC	Pinal	51 min
Aug 27, 6:03 PM MST	Flash Flood Warning	TWC	Pinal	3 hr
Aug 27, 6:05 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 27, 6:15 PM MST	Flash Flood Warning	TWC	Pima	3 hr
Aug 27, 6:19 PM MST	Flash Flood Warning	TWC	Pima	3 hr
Aug 27, 6:19 PM MST	Severe Thunderstorm Warning	TWC	Pima	26 min
Aug 27, 6:34 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	41 min
Aug 27, 6:40 PM MST	Severe Thunderstorm Warning	TWC	Pima	21 min
Aug 27, 6:52 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Aug 27, 7:15 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Aug 27, 7:27 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	63 min
Aug 28, 1:58 PM MST	Flood Watch	TWC	Cochise, Graham, Pima, Pinal, Santa Cruz	72 hr

Nearby

Flash Flood Warnings in Arizona, 2026 Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; radar from the NEXRAD Level II archive.