Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 30, NWS Tucson, AZ

July 15, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 15, 2021, 8:40 AM MST for Pima County, Arizona. It was in force for 114 min. 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 15, 2021, 8:40 AM MST (15:40 UTC)
Expired: Jul 15, 2021, 10:34 AM MST
In force: 114 min
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), 53 km from the middle of the area, began a volume at 15:40 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, 3.7 hours before the alert went out and 14 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: 1024 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

780 
WGUS55 KTWC 151540
FFWTWC
AZC019-151845-
/O.NEW.KTWC.FF.W.0030.210715T1540Z-210715T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
840 AM MST Thu Jul 15 2021

The National Weather Service in Tucson has issued a

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

* Until 1145 AM MST.

* At 840 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across portions of the city of Tucson. Up to 1.25 
  inches of rain has fallen on the west side near Silverbell and 
  Grant 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, 
  Pascua Pueblo Yaqui Reservation, Valencia West, Tucson Estates, 
  Catalina Foothills and Ryan AirField.

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 3232 11098 3227 11109 3222 11114 3211 11118
      3209 11114 3220 11089 3229 11085 3234 11089
      3234 11094

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

$$

GL

2 follow-up statements

034 
WGUS75 KTWC 151615
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
915 AM MST Thu Jul 15 2021

AZC019-151845-
/O.CON.KTWC.FF.W.0030.000000T0000Z-210715T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
915 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 AM MST THIS 
MORNING FOR EAST CENTRAL PIMA COUNTY...

At 915 AM MST, Doppler radar indicated thunderstorms producing heavy 
rain across portions of the Tucson area with the highest amounts on 
the west side. Up to 1.25 inches of rain has 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...
  Tucson, Casas Adobes, Drexel Heights, Flowing Wells, South Tucson, 
  Pascua Pueblo Yaqui Reservation, Valencia West, Tucson Estates, 
  Catalina Foothills and Ryan AirField.

This includes the following Flash Flood Prone Locations...
Anklam Wash, Painted Hills Wash, Camino De Oeste Wash and Speedway 
Wash near Silverbell Road.

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 3232 11098 3227 11109 3222 11114 3211 11118
      3209 11114 3220 11089 3229 11085 3234 11089
      3234 11094

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

$$

GL

098 
WGUS75 KTWC 151734
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1034 AM MST Thu Jul 15 2021

AZC019-151744-
/O.CAN.KTWC.FF.W.0030.000000T0000Z-210715T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1034 AM MST Thu Jul 15 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL 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.

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

LAT...LON 3232 11098 3227 11109 3222 11114 3211 11118
      3209 11114 3220 11089 3229 11085 3234 11089
      3234 11094

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:33 PM MST	Special Weather Statement	TWC		27 min
Jul 14, 5:41 PM MST	Special Weather Statement	TWC		49 min
Jul 15, 6:07 AM MST	Areal Flood Advisory	TWC	Pima	113 min
Jul 15, 6:33 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 15, 8:12 AM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 15, 8:32 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 15, 1:51 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 15, 1:55 PM MST	Special Weather Statement	TWC	Greenlee	35 min
Jul 15, 2:19 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	41 min
Jul 15, 2:31 PM MST	Areal Flood Advisory	TWC	Cochise	119 min
Jul 15, 2:52 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Jul 15, 3:15 PM MST	Severe Thunderstorm Warning	TWC	Graham	45 min
Jul 15, 3:30 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Jul 15, 3:57 PM MST	Severe Thunderstorm Warning	TWC	Graham	33 min
Jul 15, 4:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Jul 15, 4:42 PM MST	Special Weather Statement	TWC	Graham	33 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.