Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 132, NWS Tucson, AZ

August 16, 2021Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 16, 2021, 12:39 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: Aug 16, 2021, 12:39 PM MST (19:39 UTC)
Expired: Aug 16, 2021, 3:45 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 Tucson radar (KEMX), 84 km from the middle of the area, began a volume at 19:41 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, 7.7 hours before the alert went out and 52 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: 1291 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

264 
WGUS55 KTWC 161939
FFWTWC
AZC021-162245-
/O.NEW.KTWC.FF.W.0132.210816T1939Z-210816T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1239 PM MST Mon Aug 16 2021

The National Weather Service in Tucson has issued a

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

* Until 345 PM MST.

* At 1239 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2.5 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...
  Oracle.

This includes the following highways...
	Route 77 between mile markers 95 and 103.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3268 11077 3261 11075 3259 11080 3258 11089
      3261 11089 3265 11090 3268 11084

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

$$

KRG

1 follow-up statement

200 
WGUS75 KTWC 162110
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
210 PM MST Mon Aug 16 2021

AZC021-162245-
/O.CON.KTWC.FF.W.0132.000000T0000Z-210816T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
210 PM MST Mon Aug 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST THIS 
AFTERNOON FOR SOUTHEASTERN PINAL COUNTY...

At 210 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1 and 2.5 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...
  Oracle.

This includes the following highways...
	Route 77 between mile markers 95 and 103.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3268 11077 3261 11075 3259 11080 3258 11089
      3261 11089 3265 11090 3268 11084

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

$$

KRG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 7:02 PM MST	Special Weather Statement	TWC	Greenlee	43 min
Aug 15, 7:47 PM MST	Special Weather Statement	TWC	Graham	58 min
Aug 15, 8:30 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	46 min
Aug 16, 12:20 PM MST	Severe Thunderstorm Warning	TWC	Pinal	55 min
Aug 16, 1:27 PM MST	Severe Thunderstorm Warning	TWC	Pinal	48 min
Aug 16, 1:49 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Aug 16, 3:06 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Aug 16, 3:11 PM MST	Special Weather Statement	TWC	Santa Cruz	34 min
Aug 16, 3:14 PM MST	Special Weather Statement	TWC	Graham	46 min
Aug 16, 3:58 PM MST	Special Weather Statement	TWC	Graham	47 min
Aug 16, 4:38 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Aug 16, 4:44 PM MST	Severe Thunderstorm Warning	TWC	Graham	46 min

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.