Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 48, NWS Tucson, AZ

July 18, 2021Cochise County, Graham County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 18, 2021, 6:33 PM MST for Cochise County, Graham 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 18, 2021, 6:33 PM MST (01:33 UTC)
Expired: Jul 18, 2021, 9:45 PM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Cochise County, AZ, Graham County, AZ

The radar

The Tucson radar (KEMX), 84 km from the middle of the area, began a volume at 01:33 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

Phoenix, AZ (KPSR), launched 00:00Z, 1.6 hours before the alert went out and 232 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: 1031 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 2190 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

828 
WGUS55 KTWC 190133
FFWTWC
AZC003-009-190445-
/O.NEW.KTWC.FF.W.0048.210719T0133Z-210719T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
633 PM MST Sun Jul 18 2021

The National Weather Service in Tucson has issued a

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

* Until 945 PM MST.

* At 633 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2 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...
  Willcox.

This includes the following highways...
	Route 186 between mile markers 327 and 338.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3243 10999 3247 10991 3240 10971 3220 10966
      3217 10972 3213 10982 3220 10989 3225 10987
      3229 10991 3229 11001 3238 11007

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

$$

KRG

1 follow-up statement

365 
WGUS75 KTWC 190438
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
938 PM MST Sun Jul 18 2021

AZC003-009-190448-
/O.EXP.KTWC.FF.W.0048.000000T0000Z-210719T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cochise AZ-Graham AZ-
938 PM MST Sun Jul 18 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 945 PM MST THIS EVENING FOR 
NORTH CENTRAL COCHISE AND SOUTHERN GRAHAM COUNTIES...

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 1200 AM MST for a 
portion of Southeast Arizona.

LAT...LON 3243 10999 3247 10991 3240 10971 3220 10966
      3217 10972 3213 10982 3220 10989 3225 10987
      3229 10991 3229 11001 3238 11007

$$

KRG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 5:06 PM MST	Special Weather Statement	TWC		39 min
Jul 18, 5:10 PM MST	Special Weather Statement	TWC	Cochise	35 min
Jul 18, 5:27 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	48 min
Jul 18, 5:30 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 18, 5:37 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Graham, Greenlee	3 hr
Jul 18, 5:42 PM MST	Areal Flood Advisory	TWC	Cochise, Santa Cruz	3 hr
Jul 18, 5:46 PM MST	Special Weather Statement	TWC		44 min
Jul 18, 6:01 PM MST	Special Weather Statement	TWC	Cochise	59 min
Jul 18, 6:02 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Santa Cruz	43 min
Jul 18, 6:06 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	2 hr
Jul 18, 6:11 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 18, 6:12 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	48 min
Jul 18, 6:24 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	36 min
Jul 18, 6:39 PM MST	Special Weather Statement	TWC		66 min
Jul 18, 6:43 PM MST	Areal Flood Advisory	TWC	Cochise, Graham, Pima	3 hr
Jul 18, 7:00 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise, Pima	3 hr
Jul 18, 7:07 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	38 min
Jul 18, 7:23 PM MST	Areal Flood Advisory	TWC	Cochise, Pima, Santa Cruz	3 hr
Jul 18, 7:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 18, 7:36 PM MST	Special Weather Statement	TWC	Cochise	39 min
Jul 18, 7:45 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 18, 7:51 PM MST	Special Weather Statement	TWC		39 min
Jul 18, 8:20 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 18, 9:30 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 19, 3:23 PM MST	Special Weather Statement	TWC	Greenlee	22 min
Jul 19, 4:03 PM MST	Areal Flood Advisory	TWC	Greenlee	3 hr
Jul 19, 4:06 PM MST	Severe Thunderstorm Warning	TWC	Graham, Greenlee	39 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.