Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS Tucson, AZ

July 12, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 12, 2021, 10:24 PM MST for Pima 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 12, 2021, 10:24 PM MST (05:24 UTC)
Expired: Jul 13, 2021, 1:30 AM MST
In force: 3 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 19 km from the middle of the area, began a volume at 05:26 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, 5.4 hours before the alert went out and 21 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: 1102 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 2775 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

384 
WGUS55 KTWC 130524
FFWTWC
AZC019-130830-
/O.NEW.KTWC.FF.W.0019.210713T0524Z-210713T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
1024 PM MST Mon Jul 12 2021

The National Weather Service in Tucson has issued a

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

* Until 130 AM MST.

* At 1024 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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...
  Tucson, Sahuarita, Green Valley, Davis-Monthan Air Force Base, 
  Tanque Verde, Vail, East Sahuarita, Corona De Tucson, Summit, 
  Saguaro National Park East, Tucson International Airport and Rita 
  Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3226 11075 3214 11045 3180 11046 3180 11098
      3194 11111

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

$$

RH

2 follow-up statements

336 
WGUS75 KTWC 130712
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1212 AM MST Tue Jul 13 2021

AZC019-130830-
/O.CON.KTWC.FF.W.0019.000000T0000Z-210713T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1212 AM MST Tue Jul 13 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM MST EARLY THIS 
MORNING FOR EAST CENTRAL PIMA COUNTY...

At 1212 AM MST, Doppler radar indicated that the thunderstorms that 
produced the heavy rainfall had moved south of the warning area. 
Between 0.5 and 1.5 inches of rain had occurred in the warning area. 
Additional rainfall amounts of 0.1 to 0.2 inches are possible. Flash 
flooding is ongoing with flooded washes.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Tucson, Sahuarita, Green Valley, Davis-Monthan Air Force Base, 
  Tanque Verde, Vail, East Sahuarita, Corona De Tucson, Summit, 
  Saguaro National Park East, Tucson International Airport and Rita 
  Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3226 11075 3214 11045 3180 11046 3180 11098
      3194 11111

FLASH FLOOD...RADAR INDICATED

$$

GZ

374 
WGUS75 KTWC 130828
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
128 AM MST Tue Jul 13 2021

AZC019-130838-
/O.EXP.KTWC.FF.W.0019.000000T0000Z-210713T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
128 AM MST Tue Jul 13 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 130 AM MST EARLY THIS MORNING 
FOR EAST CENTRAL PIMA COUNTY...

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

LAT...LON 3226 11075 3214 11045 3180 11046 3180 11098
      3194 11111

$$

GZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:29 PM MST	Special Weather Statement	TWC	Graham	31 min
Jul 12, 6:39 PM MST	Special Weather Statement	TWC	Graham	36 min
Jul 12, 7:09 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	36 min
Jul 12, 7:28 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	47 min
Jul 12, 7:45 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	45 min
Jul 12, 7:49 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	41 min
Jul 12, 7:50 PM MST	Special Weather Statement	TWC		40 min
Jul 12, 8:05 PM MST	Areal Flood Advisory	TWC	Graham	3 hr
Jul 12, 8:22 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	38 min
Jul 12, 8:37 PM MST	Severe Thunderstorm Warning	TWC	Pinal	38 min
Jul 12, 8:37 PM MST	Tornado Warning	TWC	Santa Cruz	23 min
Jul 12, 8:51 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	39 min
Jul 12, 9:11 PM MST	Special Weather Statement	TWC		34 min
Jul 12, 9:14 PM MST	Special Weather Statement	TWC	Pinal	31 min
Jul 12, 9:22 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	38 min
Jul 12, 9:30 PM MST	Dust Storm Warning	TWC	Pima, Pinal	60 min
Jul 12, 9:32 PM MST	Special Weather Statement	TWC	Santa Cruz	43 min
Jul 12, 9:54 PM MST	Areal Flood Advisory	TWC	Cochise, Pima	3 hr
Jul 12, 9:58 PM MST	Special Weather Statement	TWC		47 min
Jul 12, 10:16 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	3 hr
Jul 12, 10:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 12, 10:34 PM MST	Special Weather Statement	TWC	Santa Cruz	56 min
Jul 12, 11:17 PM MST	Special Weather Statement	TWC	Pima	28 min
Jul 13, 2:02 PM MST	Special Weather Statement	TWC	Cochise	43 min
Jul 13, 2:57 PM MST	Special Weather Statement	TWC	Santa Cruz	33 min
Jul 13, 3:02 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	43 min
Jul 13, 3:21 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	2 hr
Jul 13, 3:45 PM MST	Special Weather Statement	TWC	Santa Cruz	45 min
Jul 13, 4:15 PM MST	Special Weather Statement	TWC	Santa Cruz	45 min
Jul 13, 4:20 PM MST	Special Weather Statement	TWC		25 min
Jul 13, 4:38 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 13, 4:44 PM MST	Special Weather Statement	TWC	Cochise	46 min
Jul 13, 4:45 PM MST	Special Weather Statement	TWC		30 min
Jul 13, 4:58 PM MST	Severe Thunderstorm Warning	TWC	Pinal	32 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.