Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 64, NWS Tucson, AZ

July 24, 2021Pima County, Arizona

NWS Tucson, AZ issued this flash flood warning at Jul 24, 2021, 9:51 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 24, 2021, 9:51 PM MST (04:51 UTC)
Expired: Jul 25, 2021, 1:00 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), 35 km from the middle of the area, began a volume at 04:50 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, 4.9 hours before the alert went out and 34 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: 115 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

757 
WGUS55 KTWC 250451
FFWTWC
AZC019-250800-
/O.NEW.KTWC.FF.W.0064.210725T0451Z-210725T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tucson AZ
951 PM MST Sat Jul 24 2021

The National Weather Service in Tucson has issued a

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

* Until 100 AM MST.

* At 951 PM MST, Doppler radar indicated showers 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...
  Sahuarita, Green Valley and East Sahuarita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3190 11110 3180 11109 3183 11084 3194 11086

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

$$

RH

1 follow-up statement

561 
WGUS75 KTWC 250758
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
1258 AM MST Sun Jul 25 2021

AZC019-250808-
/O.EXP.KTWC.FF.W.0064.000000T0000Z-210725T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima AZ-
1258 AM MST Sun Jul 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1 AM MST EARLY THIS MORNING 
FOR SOUTHEASTERN PIMA COUNTY...

The heavy rain which prompted the warning has ended, though some 
light to moderate rainfall is still occurring. Dangerous 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 Monday for a 
portion of Southeast Arizona.

LAT...LON 3190 11110 3180 11109 3183 11084 3194 11086

$$

EC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 9:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 24, 9:58 PM MST	Areal Flood Advisory	TWC	Cochise, Pima	3 hr
Jul 25, 12:53 AM MST	Areal Flood Warning	TWC	Pima	8 hr
Jul 25, 3:14 AM MST	Areal Flood Warning	TWC	Pima	3 hr
Jul 25, 3:25 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 4:15 AM MST	Areal Flood Advisory	TWC	Pima, Pinal	5 hr
Jul 25, 6:27 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	4 hr
Jul 25, 8:52 AM MST	Areal Flood Warning	TWC	Pima	9 hr
Jul 25, 9:09 AM MST	Areal Flood Advisory	TWC	Cochise, Pima, Pinal	7 hr
Jul 25, 9:24 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pinal	3 hr
Jul 25, 9:53 AM MST	Areal Flood Warning	TWC	Pima	6 hr
Jul 25, 9:55 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 10:22 AM MST	Areal Flood Warning	TWC	Pima, Pinal	6 hr
Jul 25, 10:31 AM MST	Flash Flood Warning	TWC	Pima	3 hr
Jul 25, 11:39 AM MST	Areal Flood Advisory	TWC	Santa Cruz	4 hr
Jul 25, 1:36 PM MST	Flash Flood Warning	TWC	Pima	114 min
Jul 25, 1:42 PM MST	Special Weather Statement	TWC		63 min
Jul 25, 2:00 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 25, 3:07 PM MST	Areal Flood Warning	TWC	Santa Cruz	12 hr
Jul 25, 3:34 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Jul 25, 4:15 PM MST	Areal Flood Warning	TWC	Pima, Pinal	43 hr
Jul 25, 4:49 PM MST	Areal Flood Advisory	TWC	Cochise	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.