Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 69, NWS Tucson, AZ

July 25, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 25, 2021, 1:36 PM MST for Pima County, Arizona. It was in force for 114 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 25, 2021, 1:36 PM MST (20:36 UTC)
Expired: Jul 25, 2021, 3:30 PM MST
In force: 114 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 34 km from the middle of the area, began a volume at 20:35 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.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 8.6 hours before the alert went out and 12 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 151 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

379 
WGUS55 KTWC 252036
FFWTWC
AZC019-252230-
/O.NEW.KTWC.FF.W.0069.210725T2036Z-210725T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
136 PM MST Sun Jul 25 2021

The National Weather Service in Tucson has issued a

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

* Until 330 PM MST.

* At 136 PM MST, Doppler radar and automated rain gauges continued 
  to indicate rain across the warned area, with heavy rainfall 
  earlier. The Franco Wash has risen with a current value of 2,300 
  cfs. This wash flows through the community of Summit. Additional 
  rainfall amounts of 0.2 to 0.4 inches are possible. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by rainfall and saturated soils.

  SOURCE...Radar and automated gauges.

  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, Sahuarita, Summit and Tucson International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3211 11098 3210 11087 3201 11082 3198 11098

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

GZ

2 follow-up statements

643 
WGUS75 KTWC 252159
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
259 PM MST Sun Jul 25 2021

AZC019-252230-
/O.CON.KTWC.FF.W.0069.000000T0000Z-210725T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
259 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM MST THIS 
AFTERNOON FOR EASTERN PIMA COUNTY...

At 259 PM MST, Doppler radar and automated rain gauges continue to 
indicate light rain across the warned area, with heavy rainfall 
earlier in this area. The Franco Wash continues to slowly recede. 
Additional rainfall amounts of 0.1 to 0.3 inches are possible.

HAZARD...Flash flooding caused by rainfall and saturated soils.

SOURCE...Radar and automated gauges.

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, Sahuarita, Summit and Tucson International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3211 11098 3210 11087 3201 11082 3198 11098

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

GZ

636 
WGUS75 KTWC 252230
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
330 PM MST Sun Jul 25 2021

AZC019-252240-
/O.EXP.KTWC.FF.W.0069.000000T0000Z-210725T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
330 PM MST Sun Jul 25 2021

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

Flood waters have receded. The heavy rain has ended. Flash flooding 
is no longer expected to pose a threat. Please continue to heed 
remaining road closures.

A Flash Flood Watch remains in effect until 1200 AM MST Monday for a 
portion of Southeast Arizona.

LAT...LON 3211 11098 3210 11087 3201 11082 3198 11098

$$

GZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 9:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 24, 9:51 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 24, 9:58 PM MST	Areal Flood Advisory	TWC	Cochise, Pima	3 hr
Jul 25, 12:53 AM MST	Areal Flood Warning	TWC	Pima	8 hr
Jul 25, 3:14 AM MST	Areal Flood Warning	TWC	Pima	3 hr
Jul 25, 3:25 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 4:15 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	5 hr
Jul 25, 6:27 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	4 hr
Jul 25, 8:52 AM MST	Areal Flood Warning	TWC	Pima	9 hr
Jul 25, 9:09 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Pinal	7 hr
Jul 25, 9:24 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 25, 9:53 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 9:55 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 10:22 AM MST	Areal Flood Warning	TWC	Pima, Pinal	6 hr
Jul 25, 10:31 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 11:39 AM MST	Areal Flood Advisory	TWC	Santa Cruz	4 hr
Jul 25, 1:42 PM MST	Special Weather Statement	TWC		63 min
Jul 25, 2:00 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 25, 3:07 PM MST	Areal Flood Warning	TWC	Santa Cruz	12 hr
Jul 25, 3:34 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Jul 25, 4:15 PM MST	Areal Flood Warning	TWC	Pima, Pinal	43 hr
Jul 25, 4:49 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr

Nearby

Flash Flood Warnings in Arizona, 2021 Every flash flood warning in 2021

Sources

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