Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 3, NWS Tucson, AZ

July 2, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 2, 2021, 2:53 PM MST for Pima County, Arizona. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 2, 2021, 2:53 PM MST (21:53 UTC)
Expired: Jul 2, 2021, 6:00 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), 52 km from the middle of the area, began a volume at 21:55 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.

What was reported inside it

Time	Report	Where	Remark
Jul 2, 3:00 PM MST	HEAVY RAIN 1.4	8 Nne Tucson, AZ	1.4 INCHES IN 30 MINUTES.
Jul 2, 4:00 PM MST	FLASH FLOOD	8 Nne Tucson, AZ	VENTANA CANYON WASH IS FLOWING AND BLOCKING VEHICLE TRAVEL ON SNYDER ROAD. WATER LEVEL IS 1 FOOT DEEP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.9 hours before the alert went out and 17 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: 385 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1652 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

443 
WGUS55 KTWC 022153
FFWTWC
AZC019-030100-
/O.NEW.KTWC.FF.W.0003.210702T2153Z-210703T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
253 PM MST Fri Jul 2 2021

The National Weather Service in Tucson has issued a

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

* Until 600 PM MST.

* At 253 PM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2 inches of rain have 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, Catalina Foothills, Sabino Canyon Recreation 
  Area and Seven Falls.

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 3236 11090 3232 11093 3228 11094 3226 11088
      3226 11082 3227 11081 3234 11076 3236 11081
      3236 11087

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

$$

JM

2 follow-up statements

488 
WGUS75 KTWC 022331
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
431 PM MST Fri Jul 2 2021

AZC019-030100-
/O.CON.KTWC.FF.W.0003.000000T0000Z-210703T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
431 PM MST Fri Jul 2 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 6 PM MST THIS EVENING 
FOR NORTHEASTERN PIMA COUNTY...

At 431 PM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 3 inches of rain have fallen. Additional rainfall amounts up to 
0.5 inches are possible in the warned area. Flash flooding is 
ongoing in portions of the warned area.

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, Catalina Foothills, Sabino Canyon Recreation 
  Area and Seven Falls.

This includes the following streams and drainages...
  Bird Canyon, Pantano Wash, Tanque Verde Wash, Sabino Creek, 
  Ventana Canyon Wash, Rillito River and Esperero 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 3236 11090 3232 11093 3228 11094 3226 11088
      3226 11082 3227 11081 3234 11076 3236 11081
      3236 11087

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

$$

JM

176 
WGUS75 KTWC 030056
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
556 PM MST Fri Jul 2 2021

AZC019-030106-
/O.EXP.KTWC.FF.W.0003.000000T0000Z-210703T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
556 PM MST Fri Jul 2 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MST THIS EVENING FOR 
NORTHEASTERN PIMA COUNTY...

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

LAT...LON 3236 11090 3232 11093 3228 11094 3226 11088
      3226 11082 3227 11081 3234 11076 3236 11081
      3236 11087

$$

JG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 5:15 PM MST	Special Weather Statement	TWC	Cochise	45 min
Jul 2, 11:58 AM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 2, 12:46 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 2, 1:34 PM MST	Special Weather Statement	TWC	Graham	26 min
Jul 2, 2:05 PM MST	Severe Thunderstorm Warning	TWC	Pinal	40 min
Jul 2, 2:27 PM MST	Special Weather Statement	TWC		33 min
Jul 2, 2:36 PM MST	Severe Thunderstorm Warning	TWC	Pinal	39 min
Jul 2, 2:48 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Jul 2, 3:01 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	44 min
Jul 2, 3:10 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	50 min
Jul 2, 3:14 PM MST	Areal Flood Advisory	TWC	Pinal	3 hr
Jul 2, 3:24 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 2, 3:25 PM MST	Dust Storm Warning	TWC	Pima, Pinal	95 min
Jul 2, 3:33 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Jul 2, 3:35 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	40 min
Jul 2, 3:54 PM MST	Special Weather Statement	TWC	Santa Cruz	51 min
Jul 2, 3:55 PM MST	Special Weather Statement	TWC	Graham	65 min
Jul 2, 4:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise	39 min
Jul 2, 4:09 PM MST	Special Weather Statement	TWC	Graham	51 min
Jul 2, 4:24 PM MST	Special Weather Statement	TWC	Santa Cruz	36 min
Jul 2, 4:34 PM MST	Special Weather Statement	TWC	Santa Cruz	26 min
Jul 2, 4:35 PM MST	Special Weather Statement	TWC	Cochise	40 min
Jul 2, 4:46 PM MST	Special Weather Statement	TWC	Santa Cruz	29 min
Jul 2, 4:51 PM MST	Special Weather Statement	TWC	Pinal	24 min
Jul 2, 4:56 PM MST	Areal Flood Advisory	TWC	Santa Cruz	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.