Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Phoenix, AZ

July 14, 2021Pinal County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 14, 2021, 7:19 AM MST for Pinal County, Arizona. It was in force for 116 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 14, 2021, 7:19 AM MST (14:19 UTC)
Expired: Jul 14, 2021, 9:15 AM MST
In force: 116 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 29 km from the middle of the area, began a volume at 14:18 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.

What was reported inside it

Time	Report	Where	Remark
Jul 14, 8:32 AM MST	FLASH FLOOD	8 Nnw Florence, AZ	PINAL COUNTY SHERIFFS DISPATCH REPORTS ROAD CLOSURES ON COOPER ROAD BETWEEN ARIZONA FARMS ROAD AND JUDD ROAD DUE TO RUNNING WASHES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 2.3 hours before the alert went out and 61 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.

995 
WGUS55 KPSR 141419
FFWPSR
AZC021-141615-
/O.NEW.KPSR.FF.W.0033.210714T1419Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Phoenix has issued a

* Flash Flood Warning for...
  Pinal County in southeastern Arizona...

* Until 915 AM MST.

* At 719 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. 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...
  Florence, Coolidge, Gold Canyon, San Tan Valley, Florence 
  Junction, Queen Valley, and Valley Farms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3284 11162 3307 11167 3338 11146 3338 11129
      3330 11119 3311 11127 3310 11128

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

$$

AJ

1 follow-up statement

968 
WGUS75 KPSR 141618
FFSPSR

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

AZC021-141628-
/O.EXP.KPSR.FF.W.0033.000000T0000Z-210714T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pinal AZ-
918 AM MST Wed Jul 14 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR PINAL COUNTY...

Heavy rain has ended and flash flooding is no longer expected. 
However, lingering runoff and ponding of water in low spots may 
still pose a hazard to motorists.

A Flash Flood Watch remains in effect until 1100 AM MST for a 
portion of south central Arizona.

LAT...LON 3284 11162 3307 11167 3338 11146 3338 11129
      3330 11119 3311 11127 3310 11128

$$

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, 5:16 AM MST	Flash Flood Warning	PSR	Maricopa	4 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, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.