Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 2, NWS Phoenix, AZ

July 15, 2017Maricopa County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Jul 15, 2017, 6:13 PM MST for Maricopa County, Arizona. It was in force for 3 hr. 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 15, 2017, 6:13 PM MST (01:13 UTC)
Expired: Jul 15, 2017, 9:15 PM MST
In force: 3 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County Maricopa County, AZ

The radar

The Phoenix radar (KIWA), 123 km from the middle of the area, began a volume at 01:16 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 15, 6:30 PM MST	FLASH FLOOD	3 Wnw Wickenburg, AZ	SOLS WASH CLOSED AT VULTURE MINE ROAD. DELAYED REPORT.

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 00:00Z, 1.2 hours before the alert went out and 92 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: 791 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 2539 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

936 
WGUS55 KPSR 160113
FFWPSR
AZC013-160415-
/O.NEW.KPSR.FF.W.0002.170716T0113Z-170716T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
613 PM MST SAT JUL 15 2017

The National Weather Service in Phoenix has issued a

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

* Until 915 PM MST

* At 611 PM MST, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to one inch of rain has
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Wickenburg, Circle City and Morristown. 

* Running water is likely in local washes. Do not enter any water 
  that is crossing the road.

LAT...LON 3398 11269 3396 11260 3381 11258 3383 11300
      3400 11298 3400 11273

$$

Hirsch

1 follow-up statement

721 
WGUS75 KPSR 160156
FFSPSR

Flash Flood Statement
National Weather Service Phoenix AZ
656 PM MST SAT JUL 15 2017

AZC013-160415-
/O.CON.KPSR.FF.W.0002.000000T0000Z-170716T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
656 PM MST SAT JUL 15 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST FOR
MARICOPA COUNTY...

At 653 PM MST, gauge reports indicated thunderstorms were producing 
heavy rain over the warned area. Up to two inches of rain has 
already fallen.

Some locations that will experience flooding include...
Wickenburg, Circle City and Morristown. 

Additional rainfall amounts of up to an inch are possible in the 
warned area. Washes including Hartman Wash and Sols Wash are likely 
running. Do not enter any water that is crossing the road.

LAT...LON 3398 11269 3396 11260 3381 11258 3383 11300
      3400 11298 3400 11273

$$

Hirsch

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:31 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	29 min
Jul 15, 5:39 PM MST	Dust Storm Warning	PSR	Maricopa, Pinal	2 hr
Jul 15, 5:55 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Jul 15, 5:57 PM MST	Special Weather Statement	PSR	Maricopa	48 min
Jul 15, 6:28 PM MST	Special Weather Statement	PSR		47 min
Jul 15, 6:52 PM MST	Special Weather Statement	PSR	La Paz	53 min
Jul 15, 7:24 PM MST	Special Weather Statement	PSR		51 min
Jul 15, 8:00 PM MST	Special Weather Statement	PSR	Maricopa	45 min
Jul 15, 8:05 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 15, 8:55 PM MST	Special Weather Statement	PSR	Yuma	65 min
Jul 15, 9:25 PM MST	Areal Flood Advisory	PSR	Maricopa, Pinal	6 hr
Jul 16, 2:47 AM MST	Flash Flood Watch	PSR	Gila, Maricopa, Pinal	43 hr
Jul 16, 3:44 PM MST	Special Weather Statement	PSR	Gila	61 min
Jul 16, 4:33 PM MST	Special Weather Statement	PSR	Gila	57 min

Nearby

Flash Flood Warnings in Arizona, 2017 Every flash flood warning in 2017

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.