Alert archive / Arizona / Flash Flood Warnings in 2019

Flash Flood Warning 57, NWS Phoenix, AZ

September 16, 2019La Paz County, Arizona

NWS Phoenix, AZ issued this flash flood warning at Sep 16, 2019, 4:04 PM MST for La Paz 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 counties it named.

The facts

Issued: Sep 16, 2019, 4:04 PM MST (23:04 UTC)
Expired: Sep 16, 2019, 8:00 PM MST
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Flood severity: None

County La Paz County, AZ

The radar

The Yuma radar (KYUX), 151 km from the middle of the area, began a volume at 23:04 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, 11.1 hours before the alert went out and 189 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: 436 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 2091 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood warning went out at Sep 16, 3:29 PM MST, 35 minutes earlier.

Area forecast discussion, Sep 16, 3:29 PM MST, 35 minutes before

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In the hours before

Special weather statement, Sep 16, 1:34 PM MST, 2 hours 30 minutes before

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Special weather statement, Sep 16, 1:52 PM MST, 2 hours 12 minutes before

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Special weather statement, Sep 16, 2:00 PM MST, 2 hours 4 minutes before

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Local storm report, Sep 16, 2:10 PM MST, 1 hour 54 minutes before

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Local storm report, Sep 16, 2:14 PM MST, 1 hour 50 minutes before

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Local storm report, Sep 16, 2:20 PM MST, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
220 PM MST MON SEP 16 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0216 PM     DUST STORM       5 NNE ARIZONA CITY      32.81N 111.63W
09/16/2019                   PINAL              AZ   TRAINED SPOTTER

            VISIBILITY 1/4 MILE IN DENSE BLOWING DUST.

&&

MP

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 1:34 PM MST	Special Weather Statement	PSR	Pinal	26 min
Sep 16, 1:49 PM MST	Dust Storm Warning	PSR	Pinal	41 min
Sep 16, 1:52 PM MST	Special Weather Statement	PSR		38 min
Sep 16, 1:56 PM MST	Severe Thunderstorm Warning	PSR	Pinal	49 min
Sep 16, 2:00 PM MST	Special Weather Statement	PSR	Gila	30 min
Sep 16, 2:25 PM MST	Dust Storm Warning	PSR	Pinal	50 min
Sep 16, 3:11 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	34 min
Sep 16, 3:25 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Sep 16, 4:54 PM MST	Special Weather Statement	PSR		51 min

Nearby

Flash Flood Warnings in Arizona, 2019 Every flash flood warning in 2019

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.