Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 24, NWS Tucson, AZ

July 14, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 14, 2021, 7:15 AM 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 14, 2021, 7:15 AM MST (14:15 UTC)
Expired: Jul 14, 2021, 10:15 AM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pima County, AZ

What was reported inside it

Time	Report	Where	Remark
Jul 14, 7:50 AM MST	FLASH FLOOD	10 Nw Tucson, AZ	SWIFT WATER RESCUE.
Jul 14, 7:50 AM MST	FLASH FLOOD	9 Wnw Tucson, AZ	SWIFT WATER RESCUE.

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, 2.3 hours before the alert went out and 21 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.

391 
WGUS55 KTWC 141415
FFWTWC
AZC019-141715-
/O.NEW.KTWC.FF.W.0024.210714T1415Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
715 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...

* Until 1015 AM MST.

* At 715 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 1 to 2 inches of rain has 
  fallen has occurred near the Tucson Mountains on the west side of 
  Tucson. Additional rainfall amounts up to 2 inch 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.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Tucson, Casas Adobes, Drexel Heights, Flowing Wells, South Tucson, 
  Three Points, Tucson Estates, Saguaro National Park West, Valencia 
  West, Catalina Foothills, Picture Rocks and Ryan AirField.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3229 11096 3229 11109 3229 11134 3219 11142
      3209 11136 3215 11101 3219 11093 3227 11094

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

$$

GL

2 follow-up statements

353 
WGUS75 KTWC 141438
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
738 AM MST Wed Jul 14 2021

AZC019-141715-
/O.CON.KTWC.FF.W.0024.000000T0000Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
738 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 AM MST THIS 
MORNING FOR NORTHEASTERN PIMA COUNTY...

At 738 AM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Automated rain gauges have recieved 
over 2 inches of rain near Ironwood Wood Drive west of Silverbell 
Road.  Additional rainfall amounts up to 1 inch 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.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
Tucson, Casas Adobes, Drexel Heights, Flowing Wells, South Tucson, 
Three Points, Tucson Estates, Saguaro National Park West, Valencia 
West, Catalina Foothills, Picture Rocks and Ryan AirField.

This includes the following streams and drainages...
Camino De Oeste Wash, Speedway Wash, Aguirre Wash, Blanco Wash and 
Santa Cruz River, Brawley Wash and Rillito River.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3229 11096 3229 11109 3229 11134 3219 11142
      3209 11136 3215 11101 3219 11093 3227 11094

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

$$

GL

955 
WGUS75 KTWC 141712 RRA
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1012 AM MST Wed Jul 14 2021

AZC019-141722-
/O.EXP.KTWC.FF.W.0024.000000T0000Z-210714T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1012 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1015 AM MST THIS MORNING FOR 
NORTHEASTERN PIMA COUNTY...

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

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

LAT...LON 3229 11096 3229 11109 3229 11134 3219 11142
      3209 11136 3215 11101 3219 11093 3227 11094

$$

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, 7:54 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, 9:22 AM MST	Flash Flood Warning Considerable damage threat	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.