Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 10, NWS Tucson, AZ

July 4, 2021Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 4, 2021, 12:33 PM MST for Cochise 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 4, 2021, 12:33 PM MST (19:33 UTC)
Expired: Jul 4, 2021, 3:45 PM MST
In force: 3 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), 56 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 95 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: 550 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

173 
WGUS55 KTWC 041933
FFWTWC
AZC003-042245-
/O.NEW.KTWC.FF.W.0010.210704T1933Z-210704T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1233 PM MST Sun Jul 4 2021

The National Weather Service in Tucson has issued a

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

* Until 345 PM MST.

* At 1233 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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, Hereford, Fort Huachuca and Ramsey Canyon Preserve.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3140 11037 3140 11023 3159 11025 3157 11036

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

$$

RH

1 follow-up statement

902 
WGUS75 KTWC 042240
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
340 PM MST Sun Jul 4 2021

AZC003-042250-
/O.EXP.KTWC.FF.W.0010.000000T0000Z-210704T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
340 PM MST Sun Jul 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MST THIS AFTERNOON FOR 
SOUTHWESTERN COCHISE COUNTY...

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

LAT...LON 3140 11037 3140 11023 3159 11025 3157 11036

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 11:35 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 11:41 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 12:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 4, 1:02 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 1:17 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 2:20 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 4, 2:39 PM MST	Special Weather Statement	TWC	Santa Cruz	51 min
Jul 4, 3:08 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	52 min
Jul 4, 3:44 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 4, 4:01 PM MST	Special Weather Statement	TWC	Santa Cruz	44 min
Jul 4, 4:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 4:36 PM MST	Special Weather Statement	TWC	Graham	24 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.