Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 106, NWS Tucson, AZ

August 10, 2021Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 10, 2021, 2:39 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: Aug 10, 2021, 2:39 PM MST (21:39 UTC)
Expired: Aug 10, 2021, 5:15 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), 59 km from the middle of the area, began a volume at 21:40 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, 9.7 hours before the alert went out and 84 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: 1176 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1330 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

763 
WGUS55 KTWC 102139
FFWTWC
AZC003-110015-
/O.NEW.KTWC.FF.W.0106.210810T2139Z-210811T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
239 PM MST Tue Aug 10 2021

The National Weather Service in Tucson has issued a

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

* Until 515 PM MST.

* At 239 PM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Up to 
  1.5 inches of rain has fallen. The Dragoon alert gage recorded 
  1.22 inches in a half hour. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar and automated gauges.

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

* Some locations that will experience flash flooding include...
  Dragoon.

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 3206 11007 3211 11002 3203 10992 3194 10995
      3193 11005 3199 11007

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

$$

AH

2 follow-up statements

375 
WGUS75 KTWC 102242
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
342 PM MST Tue Aug 10 2021

AZC003-110015-
/O.CON.KTWC.FF.W.0106.000000T0000Z-210811T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
342 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM MST THIS 
AFTERNOON FOR CENTRAL COCHISE COUNTY...

At 342 PM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 2 inches of rain have fallen. Dragoon rain gage recorded 1.89 
inches in an hour and a half. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar and automated gauges.

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

Some locations that will experience flash flooding include...
  Dragoon.

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 3206 11007 3211 11002 3203 10992 3194 10995
      3193 11005 3199 11007

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

$$

AH

705 
WGUS75 KTWC 110007
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
507 PM MST Tue Aug 10 2021

AZC003-110017-
/O.EXP.KTWC.FF.W.0106.000000T0000Z-210811T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
507 PM MST Tue Aug 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM MST THIS AFTERNOON FOR 
CENTRAL 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 3206 11007 3211 11002 3203 10992 3194 10995
      3193 11005 3199 11007

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 4:04 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Aug 10, 4:44 AM MST	Special Weather Statement	TWC		46 min
Aug 10, 5:12 AM MST	Flash Flood Warning	TWC	Pima, Pinal	3 hr
Aug 10, 5:39 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	111 min
Aug 10, 6:26 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	5 hr
Aug 10, 6:49 AM MST	Areal Flood Advisory	TWC	Cochise, Graham	116 min
Aug 10, 6:55 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Pinal	4 hr
Aug 10, 8:27 AM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Aug 10, 8:32 AM MST	Flash Flood Warning Considerable damage threat	TWC	Greenlee	3 hr
Aug 10, 9:11 AM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	3 hr
Aug 10, 10:51 AM MST	Areal Flood Warning	TWC	Pima, Pinal	18 hr
Aug 10, 11:00 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Pinal	2 hr
Aug 10, 11:09 AM MST	Areal Flood Advisory	TWC	Cochise, Graham	111 min
Aug 10, 11:41 AM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 10, 12:52 PM MST	Special Weather Statement	TWC	Cochise	38 min
Aug 10, 12:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	50 min
Aug 10, 1:38 PM MST	Special Weather Statement	TWC	Cochise	52 min
Aug 10, 1:43 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 10, 1:46 PM MST	Areal Flood Advisory	TWC	Cochise	119 min
Aug 10, 1:58 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 10, 2:00 PM MST	Special Weather Statement	TWC		45 min
Aug 10, 2:08 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Aug 10, 3:41 PM MST	Special Weather Statement	TWC	Santa Cruz	34 min
Aug 10, 4:38 PM MST	Special Weather Statement	TWC	Santa Cruz	52 min
Aug 10, 4:39 PM MST	Special Weather Statement	TWC	Pima	36 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.