Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 17, NWS Tucson, AZ

July 10, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 10, 2021, 8:41 PM MST for Pima County, Arizona. It was in force for 2 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 10, 2021, 8:41 PM MST (03:41 UTC)
Expired: Jul 10, 2021, 10:45 PM MST
In force: 2 hr
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Flood severity: None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 82 km from the middle of the area, began a volume at 03:41 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, 3.7 hours before the alert went out and 54 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: 1025 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 3304 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

862 
WGUS55 KTWC 110341
FFWTWC
AZC019-110545-
/O.NEW.KTWC.FF.W.0017.210711T0341Z-210711T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
841 PM MST Sat Jul 10 2021

The National Weather Service in Tucson has issued a

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

* Until 1045 PM MST.

* At 841 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, and roads
           as well as other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Three Points, San Pedro and Pan Tak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3219 11163 3221 11123 3195 11121 3198 11164

FLASH FLOOD...RADAR INDICATED

$$

JD

1 follow-up statement

658 
WGUS75 KTWC 110538
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1038 PM MST Sat Jul 10 2021

AZC019-110548-
/O.EXP.KTWC.FF.W.0017.000000T0000Z-210711T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1038 PM MST Sat Jul 10 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1045 PM MST THIS EVENING FOR 
CENTRAL PIMA COUNTY...

The heavy rain has ended. Ample time has passed for rainfall runoff 
to drain into normally dry washes. Flash flooding is no longer 
expected to pose a threat. Please continue to heed remaining road 
closures.

LAT...LON 3219 11163 3221 11123 3195 11121 3198 11164

$$

CWR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 5:10 PM MST	Flash Flood Warning	TWC	Cochise	2 hr
Jul 10, 5:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	61 min
Jul 10, 5:15 PM MST	Severe Thunderstorm Warning	TWC	Cochise	45 min
Jul 10, 5:23 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	52 min
Jul 10, 5:30 PM MST	Severe Thunderstorm Warning	TWC	Cochise	60 min
Jul 10, 5:42 PM MST	Flash Flood Warning	TWC	Santa Cruz	2 hr
Jul 10, 5:46 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	59 min
Jul 10, 6:05 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	40 min
Jul 10, 6:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	26 min
Jul 10, 6:22 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	53 min
Jul 10, 6:50 PM MST	Special Weather Statement	TWC		25 min
Jul 10, 6:57 PM MST	Dust Storm Warning	TWC	Pima, Santa Cruz	63 min
Jul 10, 6:57 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	48 min
Jul 10, 7:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	39 min
Jul 10, 7:07 PM MST	Dust Storm Warning	TWC	Pima, Pinal	83 min
Jul 10, 7:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 10, 7:29 PM MST	Flash Flood Warning	TWC	Cochise, Pima	2 hr
Jul 10, 7:35 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	55 min
Jul 10, 8:00 PM MST	Dust Storm Warning	TWC	Pima, Pinal	86 min
Jul 10, 8:06 PM MST	Severe Thunderstorm Warning	TWC	Pima	39 min
Jul 10, 8:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 10, 8:22 PM MST	Flash Flood Warning	TWC	Pima	113 min
Jul 10, 8:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 10, 8:40 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	66 min
Jul 10, 8:48 PM MST	Areal Flood Advisory	TWC	Pima	117 min
Jul 10, 8:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Jul 10, 8:51 PM MST	Tornado Warning	TWC	Pima	14 min
Jul 10, 9:45 PM MST	Special Weather Statement	TWC		60 min
Jul 10, 10:03 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Jul 10, 10:20 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 10, 10:36 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 11, 4:12 PM MST	Special Weather Statement	TWC	Greenlee	33 min
Jul 11, 4:44 PM MST	Special Weather Statement	TWC	Greenlee	46 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.