Alert archive / Arizona / Flash Flood Warnings in 2023

Flash Flood Warning 13, NWS Tucson, AZ

August 30, 2023Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 30, 2023, 5:08 PM 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: Aug 30, 2023, 5:08 PM MST (00:08 UTC)
Expired: Aug 30, 2023, 8:15 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 43 km from the middle of the area, began a volume at 00:10 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, 0.1 hours before the alert went out and 11 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: 639 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 3326 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

976 
WGUS55 KTWC 310008
FFWTWC
AZC019-310315-
/O.NEW.KTWC.FF.W.0013.230831T0008Z-230831T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
508 PM MST Wed Aug 30 2023

The National Weather Service in Tucson has issued a

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

* Until 815 PM MST.

* At 508 PM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Up to 1 
  inch of rain has fallen. Additional rainfall amounts of 1 to 2 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           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...
  Tucson, Tanque Verde and Catalina Foothills.

This includes the following streams and drainages...
  Sabino Creek, Ventana Canyon Wash, Tanque Verde Wash and Pantano 
  Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3221 11084 3223 11087 3226 11087 3227 11087
      3229 11085 3228 11079 3226 11076 3221 11076

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

$$

AWH

1 follow-up statement

530 
WGUS75 KTWC 310307
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
807 PM MST Wed Aug 30 2023

AZC019-310317-
/O.EXP.KTWC.FF.W.0013.000000T0000Z-230831T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
807 PM MST Wed Aug 30 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM MST THIS EVENING FOR 
EASTERN PIMA COUNTY...

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

LAT...LON 3221 11084 3223 11087 3226 11087 3227 11087
      3229 11085 3228 11079 3226 11076 3221 11076

$$

KJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 5:04 PM MST	Dust Storm Warning	TWC	Cochise	56 min
Aug 30, 5:23 PM MST	Dust Storm Advisory	TWC	Cochise, Graham	52 min
Aug 30, 5:44 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham, Pima	46 min
Aug 30, 5:56 PM MST	Severe Thunderstorm Warning	TWC	Pima	49 min
Aug 30, 6:09 PM MST	Special Weather Statement	TWC		51 min
Aug 30, 6:29 PM MST	Severe Thunderstorm Warning	TWC	Pinal	31 min
Aug 30, 6:37 PM MST	Special Weather Statement	TWC		38 min
Aug 30, 6:43 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Aug 30, 7:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 30, 7:04 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	41 min
Aug 30, 8:31 PM MST	Special Weather Statement	TWC	Pima	59 min
Aug 31, 2:35 AM MST	Blowing Dust Advisory	TWC	Pima, Pinal	17 hr
Aug 31, 1:07 PM MST	Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	29 hr
Aug 31, 3:27 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	48 min
Aug 31, 4:15 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	45 min
Aug 31, 4:33 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Aug 31, 4:42 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 31, 4:46 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	44 min

Nearby

Flash Flood Warnings in Arizona, 2023 Every flash flood warning in 2023

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.