Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 23, NWS Tucson, AZ

July 14, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 14, 2021, 7:11 AM MST for Pima County, Arizona. It was in force for 3 hr. 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 14, 2021, 7:11 AM MST (14:11 UTC)
Expired: Jul 14, 2021, 10:15 AM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 2.2 hours before the alert went out and 21 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: 1970 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1522 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

485 
WGUS55 KTWC 141411
FFWTWC
AZC019-141715-
/O.NEW.KTWC.FF.W.0023.210714T1411Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
711 AM MST Wed Jul 14 2021

The National Weather Service in Tucson has issued a

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

* Until 1015 AM MST.

* At 711 AM MST, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. Between 1 and 2 inches 
  of rain have fallen. Flash flooding is ongoing or expected to 
  begin shortly.

Excessive rainfall over the Bighorn burn scar will result in debris 
flow moving through the Pima Wash, Finger Rock and Ventana Canyon. 
The debris flow can consist of rock, mud, vegetation and other loose 
materials.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Catalina Foothills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

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

&&

LAT...LON 3240 11094 3225 11093 3225 11079 3240 11080
      3240 11083 3240 11085

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

2 follow-up statements

534 
WGUS75 KTWC 141543
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
843 AM MST Wed Jul 14 2021

AZC019-141715-
/O.CON.KTWC.FF.W.0023.000000T0000Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
843 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM MST THIS 
MORNING FOR NORTHEASTERN PIMA COUNTY...

At 843 AM MST, Doppler radar and automated rain gauges indicated 
that heavy rain was falling across the warned area. Between 1 and 2 
inches of rain have fallen. Flash flooding is ongoing or expected to 
begin shortly.

Excessive rainfall over the burn scar will result in debris flow 
moving through the Pima Wash, Finger Rock and Ventana Canyon. The 
debris flow can consist of rock, mud, vegetation and other loose 
materials.

HAZARD...Flash flooding caused by heavy rain.

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, Oro Valley, Tanque Verde, Catalina Foothills and Sabino 
  Canyon Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move away from recently burned areas. Life-threatening flooding of 
creeks, roads and normally dry washes is likely. The heavy rains 
will likely trigger rockslides, mudslides and debris flows in steep 
terrain, especially in and around these areas.

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

&&

LAT...LON 3240 11094 3225 11093 3225 11079 3240 11080
      3240 11083 3240 11085

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

GL

620 
WGUS75 KTWC 141712
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1012 AM MST Wed Jul 14 2021

AZC019-141722-
/O.EXP.KTWC.FF.W.0023.000000T0000Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1012 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1015 AM MST THIS MORNING FOR 
NORTHEASTERN PIMA COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM MST Wednesday 
for a portion of Southeast Arizona.

LAT...LON 3240 11094 3225 11093 3225 11079 3240 11080
      3240 11083 3240 11085

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:11 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 14, 3:51 AM MST	Areal Flood Advisory	TWC	Pinal	114 min
Jul 14, 4:27 AM MST	Flash Flood Warning	TWC	Pinal	2 hr
Jul 14, 5:56 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 14, 6:28 AM MST	Flash Flood Warning	TWC	Pima, Pinal	3 hr
Jul 14, 6:39 AM MST	Special Weather Statement	TWC	Pinal	51 min
Jul 14, 7:15 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 14, 7:54 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 14, 8:59 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 14, 9:09 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 14, 9:22 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	3 hr
Jul 14, 10:53 AM MST	Areal Flood Advisory	TWC	Pinal	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.