Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 32, NWS Phoenix, AZ

July 14, 2021Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 2021, 5:16 AM MST for Maricopa County, Arizona. It was in force for 4 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 14, 2021, 5:16 AM MST (12:16 UTC)
Expired: Jul 14, 2021, 8:59 AM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 52 km from the middle of the area, began a volume at 12:15 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 12:00Z, 0.3 hours before the alert went out and 22 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: 286 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 2094 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

694 
WGUS55 KPSR 141216
FFWPSR
AZC013-141615-
/O.NEW.KPSR.FF.W.0032.210714T1216Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
516 AM MST Wed Jul 14 2021

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  Maricopa County in south central Arizona...

* Until 915 AM MST.

* At 516 AM MST, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  0.5 and 1.5 inches of rain have fallen. Additional rainfall 
  amounts of 0.5 to 1 inch are possible in the warned area. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Phoenix, Glendale, Tempe, Avondale, Goodyear, El Mirage, Tolleson, 
  Laveen, Cashion, Litchfield Park, Camelback Ranch, South Phoenix, 
  South Mountain Park and Luke AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3345 11223 3340 11205 3337 11198 3335 11196
      3332 11200 3331 11206 3335 11225 3342 11237
      3349 11242 3353 11243 3356 11239 3355 11233

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Iniguez

3 follow-up statements

856 
WGUS75 KPSR 141244
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
544 AM MST Wed Jul 14 2021

AZC013-141615-
/O.CON.KPSR.FF.W.0032.000000T0000Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
544 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 AM MST THIS 
MORNING FOR MARICOPA COUNTY...

At 544 AM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 2 inches of rain have fallen. Additional rainfall amounts of 0.5 
to 1 inch are possible in the warned area. Flash flooding is ongoing 
or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Phoenix, Glendale, Tempe, Avondale, Goodyear, El Mirage, Tolleson, 
  Laveen, Cashion, Litchfield Park, Camelback Ranch, South Phoenix, 
  South Mountain Park and Luke AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3345 11223 3340 11205 3337 11198 3335 11196
      3332 11200 3331 11206 3335 11225 3342 11237
      3349 11242 3353 11243 3356 11239 3355 11233

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

$$

Iniguez

857 
WGUS75 KPSR 141446
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
746 AM MST Wed Jul 14 2021

AZC013-141615-
/O.CON.KPSR.FF.W.0032.000000T0000Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
746 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 AM MST THIS 
MORNING FOR MARICOPA COUNTY...

At 746 AM MST, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 1.5 inches of rain have fallen. Flooding of streets and normally 
dry washes is likely occurring in the warning area.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar and automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  South Phoenix, Western Glendale, Ahwatukee, Avondale, Goodyear, 
  Tolleson, Laveen, Litchfield Park, Camelback Ranch, South Mountain 
  Park and Luke AFB.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3345 11223 3340 11205 3337 11198 3335 11196
      3332 11200 3331 11206 3335 11225 3342 11237
      3349 11242 3353 11243 3356 11239 3355 11233

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

$$

AJ

762 
WGUS75 KPSR 141559
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
859 AM MST Wed Jul 14 2021

AZC013-141609-
/O.CAN.KPSR.FF.W.0032.000000T0000Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
859 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING IS CANCELLED FOR MARICOPA COUNTY...

Flood waters have receded. 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 1100 AM MST for a 
portion of south central Arizona.

LAT...LON 3345 11223 3340 11205 3337 11198 3335 11196
      3332 11200 3331 11206 3335 11225 3342 11237
      3349 11242 3353 11243 3356 11239 3355 11233

$$

AJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:00 PM MST	Special Weather Statement	PSR		45 min
Jul 14, 12:57 AM MST	Special Weather Statement	PSR		48 min
Jul 14, 2:19 AM MST	Special Weather Statement	PSR		41 min
Jul 14, 2:58 AM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 14, 4:17 AM MST	Special Weather Statement	PSR	Maricopa	43 min
Jul 14, 4:49 AM MST	Special Weather Statement	PSR	Maricopa	41 min
Jul 14, 5:04 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 14, 5:26 AM MST	Special Weather Statement	PSR		49 min
Jul 14, 6:11 AM MST	Special Weather Statement	PSR	Pinal	34 min
Jul 14, 6:59 AM MST	Special Weather Statement	PSR	Pinal	31 min
Jul 14, 7:19 AM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	116 min
Jul 14, 8:18 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 14, 8:42 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 14, 9:28 AM MST	Areal Flood Warning	PSR	Pinal	2 hr
Jul 14, 11:06 AM MST	Flash Flood Watch	PSR	Gila, Maricopa, Pinal	60 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.