Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 149, NWS Tucson, AZ

August 23, 2021Cochise County, Arizona

NWS Tucson, AZ issued this flash flood warning at Aug 23, 2021, 12:42 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 23, 2021, 12:42 PM MST (19:42 UTC)
Expired: Aug 23, 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), 128 km from the middle of the area, began a volume at 19:45 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 12:00Z, 7.7 hours before the alert went out and 158 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2559 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

209 
WGUS55 KTWC 231942
FFWTWC
AZC003-232245-
/O.NEW.KTWC.FF.W.0149.210823T1942Z-210823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1242 PM MST Mon Aug 23 2021

The National Weather Service in Tucson has issued a

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

* Until 345 PM MST.

* At 1242 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 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...
  mainly rural areas of East Central Cochise County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3173 10932 3176 10934 3187 10935 3193 10927
      3187 10917 3173 10922

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

$$

AH

2 follow-up statements

703 
WGUS75 KTWC 231948
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1248 PM MST Mon Aug 23 2021

AZC003-232245-
/O.CON.KTWC.FF.W.0149.000000T0000Z-210823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
1248 PM MST Mon Aug 23 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM MST THIS 
AFTERNOON FOR EAST CENTRAL COCHISE COUNTY...

At 1248 PM MST, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 1 and 3 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...
  mainly rural areas of East Central Cochise County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 3173 10932 3176 10934 3187 10935 3193 10927
      3187 10917 3173 10922

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

$$

AH

928 
WGUS75 KTWC 232239
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
339 PM MST Mon Aug 23 2021

AZC003-232249-
/O.EXP.KTWC.FF.W.0149.000000T0000Z-210823T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-
339 PM MST Mon Aug 23 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 345 PM MST THIS AFTERNOON FOR 
EAST 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 3173 10932 3176 10934 3187 10935 3193 10927
      3187 10917 3173 10922

$$

AH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 6:24 PM MST	Special Weather Statement	TWC	Cochise	36 min
Aug 23, 12:11 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 1:12 PM MST	Special Weather Statement	TWC	Cochise	48 min
Aug 23, 1:26 PM MST	Special Weather Statement	TWC	Cochise	49 min
Aug 23, 1:28 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Aug 23, 1:42 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 1:50 PM MST	Severe Thunderstorm Warning	TWC	Cochise	40 min
Aug 23, 1:54 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Aug 23, 2:09 PM MST	Excessive Heat Watch	TWC	Pima, Pinal	24 hr
Aug 23, 2:13 PM MST	Special Weather Statement	TWC	Cochise	47 min
Aug 23, 2:22 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Aug 23, 2:37 PM MST	Special Weather Statement	TWC	Cochise	38 min
Aug 23, 2:43 PM MST	Severe Thunderstorm Warning	TWC	Cochise	24 min
Aug 23, 3:00 PM MST	Special Weather Statement	TWC	Cochise	45 min
Aug 23, 3:32 PM MST	Areal Flood Advisory	TWC	Cochise	118 min
Aug 23, 4:03 PM MST	Special Weather Statement	TWC	Graham	42 min
Aug 23, 4:37 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	38 min
Aug 23, 4:59 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.