Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 66, NWS Tucson, AZ

July 25, 2021Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 25, 2021, 9:24 AM MST for Pinal 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, 9:24 AM MST (16:24 UTC)
Expired: Jul 25, 2021, 12:30 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 63 km from the middle of the area, began a volume at 16:28 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, 4.4 hours before the alert went out and 86 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.

990 
WGUS55 KTWC 251624
FFWTWC
AZC021-251930-
/O.NEW.KTWC.FF.W.0066.210725T1624Z-210725T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  Central Pinal County in southeastern Arizona...

* Until 1230 PM MST.

* At 924 AM MST, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. Between 1 and 3 inches 
  of rain have fallen. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain producing
           flash flooding.

  SOURCE...Radar and automated gauges.

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

* Some locations that will experience flash flooding include...
  Cactus Forest.

This includes the following highways...
	Route 79 between mile markers 104 and 128.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3311 11114 3282 11095 3259 11117 3292 11142

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

$$

WJM

1 follow-up statement

182 
WGUS75 KTWC 251926
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1226 PM MST Sun Jul 25 2021

AZC021-251936-
/O.EXP.KTWC.FF.W.0066.000000T0000Z-210725T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
1226 PM MST Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1230 PM MST THIS AFTERNOON FOR 
CENTRAL PINAL COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures with heavy 
flow continuing in streams and washes.

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

LAT...LON 3311 11114 3282 11095 3259 11117 3292 11142

$$

WJM

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, 9:53 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, 1:36 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.