Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 119, NWS Tucson, AZ

August 12, 2021Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 12, 2021, 6:42 PM MST for Cochise County, Arizona. It was in force for 2 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: Aug 12, 2021, 6:42 PM MST (01:42 UTC)
Expired: Aug 12, 2021, 8:45 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 46 km from the middle of the area, began a volume at 01:45 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 00:00Z, 1.7 hours before the alert went out and 86 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: 658 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1810 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

032 
WGUS55 KTWC 130142
FFWTWC
AZC003-130345-
/O.NEW.KTWC.FF.W.0119.210813T0142Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
642 PM MST Thu Aug 12 2021

The National Weather Service in Tucson has issued a

* Flash Flood Warning for...
  Western Cochise County in southeastern Arizona...

* Until 845 PM MST.

* At 642 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 inches of 
  rain have 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...
  Sierra Vista, Huachuca City and Fort Huachuca.

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.

Remain alert for flooding even in locations not receiving rain. 
Washes, streams, and rivers can become raging killer currents in a 
matter of minutes, even from distant rainfall.

&&

LAT...LON 3162 11027 3154 11024 3155 11036 3162 11038

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

$$

RH

2 follow-up statements

677 
WGUS75 KTWC 130212
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
712 PM MST Thu Aug 12 2021

AZC003-130345-
/O.CON.KTWC.FF.W.0119.000000T0000Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
712 PM MST Thu Aug 12 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MST THIS 
EVENING FOR WESTERN COCHISE COUNTY...

At 712 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 1.5 and 2.5 inches of rain have 
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...
  Sierra Vista, Huachuca City and Fort Huachuca.

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.

Remain alert for flooding even in locations not receiving rain. 
Washes, streams, and rivers can become raging killer currents in a 
matter of minutes, even from distant rainfall.

&&

LAT...LON 3162 11027 3154 11024 3155 11036 3162 11038

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

$$

RH

223 
WGUS75 KTWC 130339
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
839 PM MST Thu Aug 12 2021

AZC003-130349-
/O.EXP.KTWC.FF.W.0119.000000T0000Z-210813T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
839 PM MST Thu Aug 12 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 845 PM MST THIS EVENING FOR 
WESTERN COCHISE 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 500 PM MST Sunday for a 
portion of Southeast Arizona.

LAT...LON 3162 11027 3154 11024 3155 11036 3162 11038

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 6:10 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 12, 11:08 PM MST	Areal Flood Advisory	TWC	Santa Cruz	112 min
Aug 13, 1:56 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	118 min
Aug 13, 2:04 PM MST	Areal Flood Advisory	TWC	Santa Cruz	109 min
Aug 13, 2:25 PM MST	Special Weather Statement	TWC	Graham	50 min
Aug 13, 2:42 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 13, 3:14 PM MST	Special Weather Statement	TWC	Graham	46 min
Aug 13, 3:20 PM MST	Special Weather Statement	TWC		40 min
Aug 13, 3:30 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	45 min
Aug 13, 3:56 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	5 hr
Aug 13, 4:06 PM MST	Special Weather Statement	TWC	Cochise	39 min
Aug 13, 4:35 PM MST	Special Weather Statement	TWC	Santa Cruz	25 min
Aug 13, 4:37 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	113 min
Aug 13, 4:43 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	47 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.