Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 27, NWS Tucson, AZ

July 14, 2021Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 14, 2021, 9:22 AM MST for Pima County, Pinal County, Arizona. It was in force for 3 hr. 1 report 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 14, 2021, 9:22 AM MST (16:22 UTC)
Expired: Jul 14, 2021, 12:30 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 82 km from the middle of the area, began a volume at 16:25 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 14, 10:25 AM MST	FLASH FLOOD	4 Nw Marana, AZ	NORTHWEST FIRE CONDUCTED A SWIFT WATER RESCUE ON A DRIVER FROM THEIR VEHICLE IN THE AREA OF GRIER ROAD AND SANDARIO ROAD.

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, 4.4 hours before the alert went out and 42 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: 1970 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 1522 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

482 
WGUS55 KTWC 141622
FFWTWC
AZC019-021-141930-
/O.NEW.KTWC.FF.W.0027.210714T1622Z-210714T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
922 AM MST Wed Jul 14 2021

The National Weather Service in Tucson has issued a

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

* Until 1230 PM MST.

* At 922 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across northern sections of Pima County including the 
  Marana region. Up to 2 inches of rain have fallen. Additional 
  rainfall amounts up to 1 inch are possible in the warned area. 
  Flash flooding is ongoing or expected to begin shortly. In 
  addition, flow in washes such as the CDO will continue from 
  earlier rainfall.

  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...
  Tucson, Catalina, Oro Valley, Marana, Casas Adobes, Saddlebrooke, 
  Avra Valley, Tortolita, Saguaro National Park West, Catalina State 
  Park, Picture Rocks, Red Rock and Dove Mountain.

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 3250 11142 3256 11144 3259 11132 3256 11125
      3254 11125 3256 11109 3257 11099 3251 11091
      3251 11090 3249 11087 3243 11089 3238 11100
      3231 11112 3229 11124 3234 11136 3243 11140

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

$$

GL

1 follow-up statement

113 
WGUS75 KTWC 141925
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1225 PM MST Wed Jul 14 2021

AZC019-021-141935-
/O.EXP.KTWC.FF.W.0027.000000T0000Z-210714T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-Pinal AZ-
1225 PM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1230 PM MST THIS AFTERNOON FOR 
NORTHEASTERN PIMA AND SOUTH CENTRAL PINAL COUNTIES...

Flood waters have receded, though some washes continue to flow. 
Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1100 PM MST Thursday for 
a portion of Southeast Arizona.

LAT...LON 3250 11142 3256 11144 3259 11132 3256 11125
      3254 11125 3256 11109 3257 11099 3251 11091
      3251 11090 3249 11087 3243 11089 3238 11100
      3231 11112 3229 11124 3234 11136 3243 11140

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:11 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Jul 14, 3:51 AM MST	Areal Flood Advisory	TWC	Pinal	114 min
Jul 14, 4:27 AM MST	Flash Flood Warning	TWC	Pinal	2 hr
Jul 14, 5:56 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 14, 6:28 AM MST	Flash Flood Warning	TWC	Pima, Pinal	3 hr
Jul 14, 6:39 AM MST	Special Weather Statement	TWC	Pinal	51 min
Jul 14, 7:11 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 14, 7:15 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 14, 7:54 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 14, 8:59 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 14, 9:09 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 14, 10:53 AM MST	Areal Flood Advisory	TWC	Pinal	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.