Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 59, NWS Tucson, AZ

July 22, 2021Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 22, 2021, 11:06 PM 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 22, 2021, 11:06 PM MST (06:06 UTC)
Expired: Jul 23, 2021, 2:15 AM 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), 98 km from the middle of the area, began a volume at 06:08 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 00:00Z, 6.1 hours before the alert went out and 94 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: 2116 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1822 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

721 
WGUS55 KTWC 230606
FFWTWC
AZC021-230915-
/O.NEW.KTWC.FF.W.0059.210723T0606Z-210723T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1106 PM MST Thu Jul 22 2021

The National Weather Service in Tucson has issued a

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

* Until 215 AM MST.

* At 1106 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the San Pedro River Valley in Pinal County. 
  Between 1 and 3 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.

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

* Some locations that will experience flash flooding include...
  Mammoth, San Manuel, Dudleyville and Aravaipa Canyon Wilderness.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3314 11064 3293 11050 3276 11047 3261 11059
      3263 11071 3285 11082 3299 11078 3299 11077
      3300 11076 3304 11073 3304 11072 3307 11072
      3308 11071 3308 11069 3309 11069 3309 11068
      3311 11068 3311 11067 3311 11066

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

$$

GL

1 follow-up statement

306 
WGUS75 KTWC 230911
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
211 AM MST Fri Jul 23 2021

AZC021-230921-
/O.EXP.KTWC.FF.W.0059.000000T0000Z-210723T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
211 AM MST Fri Jul 23 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 215 AM MST EARLY THIS MORNING 
FOR EAST CENTRAL PINAL COUNTY...

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

A Flash Flood Watch remains in effect until 1100 PM MST Saturday for 
all of Southeast Arizona.

LAT...LON 3314 11064 3293 11050 3276 11047 3261 11059
      3263 11071 3285 11082 3299 11078 3299 11077
      3300 11076 3304 11073 3304 11072 3307 11072
      3308 11071 3308 11069 3309 11069 3309 11068
      3311 11068 3311 11067 3311 11066

$$

EC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 5:36 PM MST	Special Weather Statement	TWC	Pinal	39 min
Jul 22, 5:42 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 22, 5:44 PM MST	Special Weather Statement	TWC		46 min
Jul 22, 6:01 PM MST	Areal Flood Advisory	TWC	Pima	119 min
Jul 22, 6:19 PM MST	Special Weather Statement	TWC		26 min
Jul 22, 6:33 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 22, 6:37 PM MST	Special Weather Statement	TWC		38 min
Jul 22, 6:47 PM MST	Special Weather Statement	TWC		43 min
Jul 22, 6:57 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 22, 7:02 PM MST	Special Weather Statement	TWC	Graham	28 min
Jul 22, 7:05 PM MST	Areal Flood Advisory	TWC	Pinal	115 min
Jul 22, 7:21 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	2 hr
Jul 22, 7:46 PM MST	Special Weather Statement	TWC	Graham	59 min
Jul 22, 7:58 PM MST	Areal Flood Advisory	TWC	Graham	3 hr
Jul 22, 8:11 PM MST	Special Weather Statement	TWC	Cochise	64 min
Jul 22, 8:21 PM MST	Severe Thunderstorm Warning	TWC	Cochise	39 min
Jul 22, 8:37 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham	3 hr
Jul 22, 8:41 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Jul 22, 9:15 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 22, 9:54 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 22, 10:10 PM MST	Special Weather Statement	TWC	Santa Cruz	50 min
Jul 22, 10:15 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 22, 10:18 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 22, 10:19 PM MST	Areal Flood Advisory	TWC	Pinal	116 min
Jul 22, 10:34 PM MST	Special Weather Statement	TWC	Cochise	56 min
Jul 22, 10:45 PM MST	Special Weather Statement	TWC		45 min
Jul 22, 10:49 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 22, 11:44 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Jul 22, 11:45 PM MST	Severe Thunderstorm Warning	TWC	Pima	60 min
Jul 22, 11:52 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	4 min
Jul 23, 12:07 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 23, 12:46 AM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 23, 12:51 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 23, 2:13 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 23, 6:47 AM MST	Special Weather Statement	TWC	Pima	43 min
Jul 23, 9:06 AM MST	Areal Flood Warning	TWC	Pima, Pinal	12 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.