Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 67, NWS Tucson, AZ

July 25, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 25, 2021, 9:55 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 25, 2021, 9:55 AM MST (16:55 UTC)
Expired: Jul 25, 2021, 1:00 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), 29 km from the middle of the area, began a volume at 16:57 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, 4.9 hours before the alert went out and 29 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.

910 
WGUS55 KTWC 251655
FFWTWC
AZC019-252000-
/O.NEW.KTWC.FF.W.0067.210725T1655Z-210725T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  East Central Pima County in southeastern Arizona...

* Until 100 PM MST.

* At 955 AM MST, Doppler radar and automated rain gauges indicated a 
  large area of rain across the warned area. Between 0.5 and 1 inch 
  of rain has fallen. Additional rainfall amounts of 0.5 to 1 inch 
  are possible in the warning area. This rainfall is on top of 
  already saturated soils. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar.

  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...
  Sahuarita, Green Valley, Vail, East Sahuarita, Summit and Corona 
  De Tucson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3179 11105 3192 11069 3202 11074 3204 11114

FLASH FLOOD...RADAR INDICATED

$$

GZ

2 follow-up statements

583 
WGUS75 KTWC 251812
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1112 AM MST Sun Jul 25 2021

AZC019-252000-
/O.CON.KTWC.FF.W.0067.000000T0000Z-210725T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1112 AM MST Sun Jul 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 PM MST THIS 
AFTERNOON FOR EAST CENTRAL PIMA COUNTY...

At 1112 AM MST, Doppler radar and automated rain gauges continued to 
indicate a large area of rain across east central Pima County. 
Between 0.5 and 1 inch of rain has already fallen in this area, with 
additional rainfall amounts of 0.2 to 0.5 inches possible.

HAZARD...Flash flooding caused by heavy rain 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...
  Sahuarita, Green Valley, Vail, East Sahuarita, Summit and Corona 
  De Tucson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3179 11105 3192 11069 3202 11074 3204 11114

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

GZ

606 
WGUS75 KTWC 252001
FFSTWC

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

AZC019-252011-
/O.EXP.KTWC.FF.W.0067.000000T0000Z-210725T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
101 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR EAST CENTRAL PIMA COUNTY...

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 3179 11105 3192 11069 3202 11074 3204 11114

$$

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, 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, 1:36 PM MST	Flash Flood Warning	TWC	Pima	114 min
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.