Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 8, NWS Tucson, AZ

July 3, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 3, 2021, 1:07 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: Jul 3, 2021, 1:07 PM MST (20:07 UTC)
Expired: Jul 3, 2021, 4:00 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), 79 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 66 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: 278 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1669 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -64 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

020 
WGUS55 KTWC 032007
FFWTWC
AZC019-032300-
/O.NEW.KTWC.FF.W.0008.210703T2007Z-210703T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
107 PM MST Sat Jul 3 2021

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  South Central Pima County in southeastern Arizona...

* Until 400 PM MST.

* At 107 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across central Pima County, including portions of the 
  Tohono O'odham Nation. 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...
  Three Points, Topawa, Kitt Peak, Ali Chukson, Cowlic, Fresnal, San 
  Pedro, Coldfields, Fresnal Canyon, Pan Tak, Ali Molina and South 
  Komelik.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3189 11131 3197 11128 3213 11145 3180 11201
      3149 11142 3165 11134 3165 11150 3175 11149
      3182 11145

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

$$

Carpenter

2 follow-up statements

459 
WGUS75 KTWC 032120
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
220 PM MST Sat Jul 3 2021

AZC019-032300-
/O.CON.KTWC.FF.W.0008.000000T0000Z-210703T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
220 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 4 PM MST THIS 
AFTERNOON FOR SOUTH CENTRAL PIMA COUNTY...

At 220 PM MST, Doppler radar continued to indicate thunderstorms 
producing heavy rainfall across central Pima County, including 
portions of the Tohono O'odham Nation. Flash flooding is expected to 
continue.

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...
  Three Points, Topawa, Kitt Peak, Ali Chukson, Cowlic, Fresnal, San 
  Pedro, Coldfields, Fresnal Canyon, Pan Tak, Ali Molina and South 
  Komelik.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3189 11131 3197 11128 3213 11145 3180 11201
      3149 11142 3165 11134 3165 11150 3175 11149
      3182 11145

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

$$

Carpenter

457 
WGUS75 KTWC 032257
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
357 PM MST Sat Jul 3 2021

AZC019-032307-
/O.EXP.KTWC.FF.W.0008.000000T0000Z-210703T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
357 PM MST Sat Jul 3 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 4 PM MST THIS AFTERNOON FOR 
SOUTH CENTRAL 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 3189 11131 3197 11128 3213 11145 3180 11201
      3149 11142 3165 11134 3165 11150 3175 11149
      3182 11145

$$

Carpenter

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 5:17 PM MST	Special Weather Statement	TWC	Pinal	43 min
Jul 2, 5:31 PM MST	Special Weather Statement	TWC		44 min
Jul 2, 5:35 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	40 min
Jul 2, 6:14 PM MST	Special Weather Statement	TWC		46 min
Jul 2, 6:16 PM MST	Special Weather Statement	TWC	Pima	29 min
Jul 2, 6:16 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	44 min
Jul 2, 7:13 PM MST	Severe Thunderstorm Warning	TWC	Pima	47 min
Jul 2, 7:34 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	116 min
Jul 3, 11:17 AM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	3 hr
Jul 3, 11:21 AM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	39 min
Jul 3, 11:51 AM MST	Special Weather Statement	TWC	Pima	54 min
Jul 3, 11:58 AM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Santa Cruz	3 hr
Jul 3, 12:09 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	111 min
Jul 3, 12:17 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Santa Cruz	3 hr
Jul 3, 12:23 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	35 min
Jul 3, 12:28 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 3, 1:15 PM MST	Special Weather Statement	TWC	Pima	45 min
Jul 3, 1:20 PM MST	Special Weather Statement	TWC	Pima	40 min
Jul 3, 1:50 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	40 min
Jul 3, 2:14 PM MST	Special Weather Statement	TWC		31 min
Jul 3, 2:56 PM MST	Special Weather Statement	TWC	Pima	34 min
Jul 3, 3:31 PM MST	Special Weather Statement	TWC	Pinal	44 min
Jul 3, 3:44 PM MST	Areal Flood Advisory	TWC	Pima	2 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.