Alert archive / California / Flash Flood Warnings in 2022

Flash Flood Warning 128, NWS Phoenix, AZ

August 13, 2022Riverside County, California

NWS Phoenix, AZ issued this flash flood warning at Aug 13, 2022, 1:40 AM PDT for Riverside County, California. 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: Aug 13, 2022, 1:40 AM PDT (08:40 UTC)
Expired: Aug 13, 2022, 5:45 AM PDT
In force: 4 hr
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Riverside County, CA

The radar

The San Diego radar (KNKX), 134 km from the middle of the area, began a volume at 08:41 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

San Diego, CA (KNKX), launched 00:00Z, 8.7 hours before the alert went out and 154 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3647 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 12, 10:20 PM PDT, 3 hours 20 minutes earlier.

Area forecast discussion, Aug 12, 10:20 PM PDT, 3 hours 20 minutes before

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In the hours before

Special weather statement, Aug 12, 11:55 PM PDT, 1 hour 45 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1155 PM PDT Fri Aug 12 2022

CAZ560-561-130730-
Joshua Tree NP East CA-Joshua Tree NP West CA-
1155 PM PDT Fri Aug 12 2022

...A strong thunderstorm will impact portions of Riverside County
through 1230 AM PDT...

At 1155 PM PDT, Doppler radar was tracking a strong thunderstorm 11
miles northeast of Coachella. This storm was nearly stationary.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of Riverside County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 3397 11612 3398 11592 3389 11590 3377 11589
      3374 11595 3374 11600 3384 11613 3386 11614
TIME...MOT...LOC 0655Z 150DEG 2KT 3380 11601

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

INS

Local storm report, Aug 13, 12:00 AM PDT, 1 hour 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1200 AM MST SAT AUG 13 2022

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

0440 PM     TSTM WND DMG     11 ESE CENTENNIAL       33.52N 113.16W
08/12/2022                   MARICOPA           AZ   UTILITY COMPANY

            POWER LINE(S) DOWN.

&&

SB

Local storm report, Aug 13, 12:13 AM PDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1213 AM MST SAT AUG 13 2022

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

0305 AM     TSTM WND DMG     6 N EAST MESA           33.51N 111.67W
08/12/2022                   MARICOPA           AZ   UTILITY COMPANY

            POWER LINES DOWN.

&&

SB

Local storm report, Aug 13, 12:15 AM PDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1215 AM MST SAT AUG 13 2022

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

0322 PM     TSTM WND DMG     2 NNW MESA              33.44N 111.84W
08/12/2022                   MARICOPA           AZ   UTILITY COMPANY

            POWER LINES DOWN IN AREA.

&&

SB

Local storm report, Aug 13, 12:16 AM PDT, 1 hour 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1216 AM MST SAT AUG 13 2022

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

0305 PM     TSTM WND DMG     6 N EAST MESA           33.51N 111.67W
08/12/2022                   MARICOPA           AZ   UTILITY COMPANY

            CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 6
            N EAST MESA. POWER LINES DOWN IN AREA.

&&

SB

Local storm report, Aug 13, 12:43 AM PDT, 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1243 AM MST SAT AUG 13 2022

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

0245 PM     TSTM WND DMG     2 N PHOENIX MESA GATEWA 33.34N 111.65W
08/12/2022                   MARICOPA           AZ   PUBLIC

            POWER LINES DOWN IN AREA.

&&

SB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 5:02 PM PDT	Severe Thunderstorm Warning	PSR	La Paz, Maricopa	43 min
Aug 12, 5:09 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Maricopa	61 min
Aug 12, 5:10 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Aug 12, 5:14 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz, Maricopa, Yuma	6 hr
Aug 12, 5:23 PM PDT	Dust Storm Warning	PSR	La Paz, Yuma	67 min
Aug 12, 5:25 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Yuma	52 min
Aug 12, 5:30 PM PDT	Severe Thunderstorm Warning	PSR	Yuma	45 min
Aug 12, 5:44 PM PDT	Dust Storm Advisory	PSR	La Paz, Yuma	61 min
Aug 12, 5:48 PM PDT	Special Weather Statement	PSR	La Paz	57 min
Aug 12, 6:32 PM PDT	Areal Flood Warning	PSR	Maricopa	8 hr
Aug 12, 6:40 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Aug 12, 7:28 PM PDT	Flash Flood Warning Considerable damage threat	PSR	La Paz	4 hr
Aug 12, 11:03 PM PDT	Areal Flood Warning	PSR	La Paz	4 hr
Aug 12, 11:48 PM PDT	Special Weather Statement	PSR		27 min
Aug 13, 3:15 PM PDT	Special Weather Statement	PSR		60 min
Aug 13, 3:23 PM PDT	Special Weather Statement	PSR		52 min
Aug 13, 4:38 PM PDT	Special Weather Statement	PSR		52 min
Aug 13, 4:40 PM PDT	Special Weather Statement	PSR	La Paz	50 min
Aug 13, 4:54 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Yuma	4 hr
Aug 12, 9:59 PM PDT	Special Weather Statement	PSR	Riverside	46 min
Aug 12, 10:13 PM PDT	Areal Flood Advisory	PSR	Riverside	16 min
Aug 12, 10:29 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	3 hr
Aug 12, 11:55 PM PDT	Special Weather Statement	PSR	Riverside	35 min
Aug 13, 12:27 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial, Riverside	4 hr
Aug 13, 1:18 AM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 13, 2:10 PM PDT	Severe Thunderstorm Warning	PSR	Riverside, San Bernardino	50 min
Aug 13, 2:25 PM PDT	Severe Thunderstorm Warning	PSR	Riverside	50 min
Aug 13, 2:58 PM PDT	Special Weather Statement	PSR	Riverside	62 min
Aug 13, 3:06 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside	4 hr
Aug 13, 3:41 PM PDT	Severe Thunderstorm Warning	PSR	Imperial, Riverside	37 min
Aug 13, 3:48 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	4 hr
Aug 13, 3:57 PM PDT	Flash Flood Warning Considerable damage threat	PSR	Imperial	4 hr
Aug 13, 4:26 PM PDT	Special Weather Statement	PSR	Imperial	49 min
Aug 13, 4:42 PM PDT	Special Weather Statement	PSR	Imperial	48 min
Aug 13, 4:49 PM PDT	Severe Thunderstorm Warning	PSR	Imperial	41 min

Nearby

Flash Flood Warnings in California, 2022 Every flash flood warning in 2022

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.