Alert archive / California / Flash Flood Warnings in 2023

Flash Flood Warning 11, NWS San Diego, CA

August 20, 2023Riverside County, California

NWS San Diego, CA issued this flash flood warning at Aug 20, 2023, 1:51 PM PDT for Riverside County, California. It was in force for 10 hr. 17 reports 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: Aug 20, 2023, 1:51 PM PDT (20:51 UTC)
Expired: Aug 20, 2023, 11:21 PM PDT
In force: 10 hr
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Riverside County, CA

The radar

The San Diego radar (KNKX), 125 km from the middle of the area, began a volume at 20:50 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
Aug 20, 2:53 PM PDT	RAIN 0.91	Palm Springs, CA	ASOS station KPSP Palm Springs Airport in 1 hour.
Aug 20, 3:30 PM PDT	FLASH FLOOD	4 Ene Indio, CA	Two vehicles stuck in rushing water on Dillon Road and Landfill Road.
Aug 20, 3:30 PM PDT	FLASH FLOOD	4 Ene Indio, CA	Two vehicles stuck in rushing water on Dillon Road and Landfill Road.
Aug 20, 3:35 PM PDT	RAIN 1	2 Ene Palm Springs, CA	Mesonet station FW8322 Cathedral City - 1 hour rainfall.
Aug 20, 3:35 PM PDT	RAIN 1	2 Ene Palm Springs, CA	Mesonet station FW8322 Cathedral City - 1 hour rainfall.
Aug 20, 4:00 PM PDT	FLOOD	1 E Palm Springs, CA	Road Closure: Landau Boulevard at Ramon Road as seen on KESQ-TV in Palm Springs.
Aug 20, 4:00 PM PDT	FLOOD	1 E Palm Springs, CA	Road Closure: Landau Boulevard at Ramon Road as seen on KESQ-TV in Palm Springs.
Aug 20, 4:12 PM PDT	RAIN 0.75	6 Ese Desert Hot Spring, CA	Mesonet station WDCC1 Desert Hot Springs - 1 hour rainfall.
Aug 20, 4:12 PM PDT	RAIN 0.75	6 Ese Desert Hot Spring, CA	Mesonet station WDCC1 Desert Hot Springs - 1 hour rainfall.
Aug 20, 4:46 PM PDT	RAIN 3.76	1 Sw Palm Desert, CA	Mesonet station GW2765 Palm Desert - total rainfall.
Aug 20, 4:46 PM PDT	RAIN 3.76	1 Sw Palm Desert, CA	Mesonet station GW2765 Palm Desert - total rainfall.
Aug 20, 7:05 PM PDT	RAIN 3.92	2 Ene Palm Springs, CA	Mesonet station FW8322 Cathedral City in Coachella Valley desert.
Aug 20, 7:05 PM PDT	RAIN 3.92	2 Ene Palm Springs, CA	Mesonet station FW8322 Cathedral City in Coachella Valley desert.
Aug 20, 10:00 PM PDT	FLOOD	1 Nw Palm Springs, CA	Palm Springs Mayor in CNN International reported 2 water rescues but extensive flooding not seen since winter 2019. 3.23 inches at PSP airport.
Aug 20, 10:00 PM PDT	FLOOD	1 Nw Palm Springs, CA	Palm Springs Mayor in CNN International reported 2 water rescues but extensive flooding not seen since winter 2019. 3.23 inches at PSP airport.
Aug 20, 10:00 PM PDT	FLASH FLOOD	5 Ssw Desert Hot Spring, CA	Corrects previous flash flood report from 5 SSW Desert Hot Springs. Indian Canyon (and Date Palm) closed UFN. Massive 250 yards of mud and debris in the Whitewater river crossed and undercut the concrete overflow on the 4 lane road. Water was still flowing and
Aug 20, 11:00 PM PDT	FLASH FLOOD	3 Ne Palm Springs, CA	Corrects previous flash flood report from 3 NE Palm Springs. I-10 at Date Palm was closed in both directions (8 lanes) due to extensive mud and water that crossed the interstate Sunday night. Both directions were down to 1 lane and miles of traffic backed up a

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this flash flood warning; the first came 99 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 8.9 hours before the alert went out and 144 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: 1111 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 188 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

147 
WGUS56 KSGX 202051
FFWSGX
CAC065-210000-
/O.NEW.KSGX.FF.W.0011.230820T2051Z-230821T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
151 PM PDT Sun Aug 20 2023

The National Weather Service in San Diego has issued a

* Flash Flood Warning for...
  Riverside County in southern California...

* Until 500 PM PDT.

* At 151 PM PDT, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. The expected rainfall 
  rate is 0.5 to 1 inch in 1 hour. Hourly rainfall rates in Palm 
  Desert have exceeded 0.75" per hour. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain 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...
  Indio, northeastern Palm Springs, Coachella, Mt San Jacinto State 
  Park, Cathedral City, Palm Desert, eastern Desert Hot Springs, 
  Rancho Mirage, North Palm Springs and Hwy 74 Between Anza And Palm 
  Desert.

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 3362 11633 3387 11664 3401 11646 3395 11643
      3391 11626 3391 11621 3385 11613 3384 11613
      3383 11613 3380 11608 3378 11606

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR

$$

Connolly

4 follow-up statements

830 
WGUS56 KSGX 202334
FFWSGX
CAC065-210200-
/O.EXT.KSGX.FF.W.0011.000000T0000Z-230821T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
434 PM PDT Sun Aug 20 2023

The National Weather Service in San Diego has extended the

* Flash Flood Warning for...
  Riverside County in southern California...

* Until 700 PM PDT.

* At 434 PM PDT, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain 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...
  Indio, northeastern Palm Springs, Coachella, Mt San Jacinto State 
  Park, Cathedral City, Palm Desert, eastern Desert Hot Springs, 
  Rancho Mirage, North Palm Springs and Hwy 74 Between Anza And Palm 
  Desert.

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 3362 11633 3387 11664 3401 11646 3395 11643
      3391 11626 3391 11621 3385 11613 3384 11613
      3383 11613 3380 11608 3378 11606

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

$$

Connolly

450 
WGUS56 KSGX 210137
FFWSGX
CAC065-210330-
/O.EXT.KSGX.FF.W.0011.000000T0000Z-230821T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
637 PM PDT Sun Aug 20 2023

The National Weather Service in San Diego has extended the

* Flash Flood Warning for...
  Riverside County in southern California...

* Until 830 PM PDT.

* At 637 PM PDT, Doppler radar and automated rain gauges indicated 
  heavy rain falling across the warned area. Flash flooding is 
  ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain 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...
  Indio, northeastern Palm Springs, Coachella, Mt San Jacinto State 
  Park, Cathedral City, Palm Desert, eastern Desert Hot Springs, 
  Rancho Mirage, North Palm Springs and Hwy 74 Between Anza And Palm 
  Desert.

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 3362 11633 3387 11664 3401 11646 3395 11643
      3391 11626 3391 11621 3385 11613 3384 11613
      3383 11613 3380 11608 3378 11606

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

$$

12

375 
WGUS56 KSGX 210315
FFWSGX
CAC065-210630-
/O.EXT.KSGX.FF.W.0011.000000T0000Z-230821T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
815 PM PDT Sun Aug 20 2023

The National Weather Service in San Diego has extended the

* Flash Flood Warning for...
  Riverside County in southern California...

* Until 1130 PM PDT.

* At 815 PM PDT, Doppler radar and automated rain gauges indicated 
  heavy rain continuing to fall across the warned area. Flash 
  flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain 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...
  Indio, northeastern Palm Springs, Coachella, Mt San Jacinto State 
  Park, Cathedral City, Palm Desert, eastern Desert Hot Springs, 
  Rancho Mirage, North Palm Springs and Hwy 74 Between Anza And Palm 
  Desert.

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 3362 11633 3387 11664 3401 11646 3395 11643
      3391 11626 3391 11621 3385 11613 3384 11613
      3383 11613 3380 11608 3378 11606

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

$$

Maxwell

261 
WGUS76 KSGX 210621
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
1121 PM PDT Sun Aug 20 2023

CAC065-210631-
/O.CAN.KSGX.FF.W.0011.000000T0000Z-230821T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
1121 PM PDT Sun Aug 20 2023

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

Please refer to the new Areal Flood Warning issued for this region. 
Please continue to heed remaining road closures.

A Flood Watch remains in effect until 100 AM PDT Tuesday for a 
portion of Southwest California.

LAT...LON 3362 11633 3387 11664 3401 11646 3395 11643
      3391 11626 3391 11621 3385 11613 3384 11613
      3383 11613 3380 11608 3378 11606

$$

Adams

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 San Diego, CA wrote its last area forecast discussion before this flash flood warning went out at Aug 20, 9:41 AM PDT, 4 hours 10 minutes earlier.

Area forecast discussion, Aug 20, 9:41 AM PDT, 4 hours 10 minutes before

Area Forecast Discussion
National Weather Service San Diego CA
941 AM PDT Sun Aug 20 2023

.SYNOPSIS...
Tropical Storm Hilary will continue to move over Southern
California today. Strong gusty winds currently being felt across
parts of San Diego County will expand northward through our
forecast area today, decreasing later tonight into Monday
morning. Widespread heavy rainfall will develop this afternoon
into this evening. The heaviest rainfall is expected for the
mountains into the deserts with catastrophic flash flooding
possible. Light rain showers will gradually push out of the region
on Monday with drier and warmer weather for Tuesday into next
weekend. West of the mountains look to be dry through the rest of
the week with a small chance for monsoonal thunderstorms for the
mountains and deserts each afternoon and evening.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

* Tropical Storm Warning in effect for all of Southern California.
* Flood Watch in effect through Monday for all of Southern
  California.
* Unnecessary travel is discouraged on today due to the high
  flooding potential.
* High Wind potential for much of the region today.

Hilary has been downgraded to a tropical storm with maximum
sustained winds of 70 MPH near the eye of the storm. The storm is
located approximately 250 miles south-southeast of San Diego and
will make landfall on the northern Baja peninsula sometime today.
Northeast winds out ahead of the storm have been howling across
the SD County mountains this morning with maximum gusts generally
40-65 MPH. Strong northeast winds will push northward through
SoCal today, where areas west of the mountains will see wind
gusts 35-45+ MPH at times. Winds will diminish this evening into
the overnight hours for all.

Not something we see very often here...a nearly saturated
atmospheric profile! Our balloon launch this morning shows very
saturated air above us with precipitable water readings over 2
inches! This has led to our radar lighting up with numerous
showers across the region this morning with areas west of the
mountains reporting a quarter to one half inch of rainfall thus
far. Cloud tops via visible satellite imagery starting to become
more pronounced over Baja California, where heavier showers and
isolated thunderstorms will impact our region later today. Areas
of Southern California will see rain rates 1-2+ inches, highest
over the mountains. Our main concern will be across the mountains
and deserts, bringing dangerous and locally catastrophic flooding
impacts. Those near burn scars and low lying roadways/desert
washes may be severely impacted. The Storm Prediction Center has
also outlined a small (2-5%) chance of brief and weak tornadoes to
occur across the Coachella Valley and Anza Borrego desert. Those
west of the mountains will see a lower flood threat, but avoiding
unnecessary travel today is a solid bet.

Hi-res models lift scattered showers out of the region through the
morning hours from south to north, with partial clearing into the
afternoon. Much cooler temperatures across interior sections of
our region are expected with humidity remaining for all locales
throughout the day. The trough of low pressure off the California
coast along with the relentless ridge of high pressure over the
Great Plains will continue to funnel in monsoonal moisture from
Mexico into SoCal through the upcoming week. This will lead to
small chances for showers and storms each afternoon/evening across
the mountains and deserts along with drier, though still a bit
humid, conditions west of the mountains.

&&

.AVIATION...
201515Z...Coast...RA with bands of RA+ today with variable CIGS 030-
070 lowering to 010-030 in bands of heavier rain. Slight chance of
TSRA this afternoon. Strong winds this afternoon and evening with
gust potential 30-45 kt. North winds shifting to the W/SW and
eventually S this evening. Most precip and strong winds will end
after 06Z Mon.

Valleys/Mountains/Deserts...RA/RA+ today with CIGS 030-070 lowering
to 010-020 in heavier rain bands. Slight chance of TS. Higher
terrain obscured at times. Strong east/southeast winds shifting west
this afternoon and then south this evening. Gusts of 50-70 kt over
the mountains and gusts of 40-50 kt elsewhere. Wind gusts may exceed
35 kt at PSP. Most precip and strong winds will end from south to
north 06Z-10Z Mon.

&&

.AVIATION...
201515Z...Coast...RA with bands of RA+ today with variable CIGS 030-
070 lowering to 010-030 in bands of heavier rain. Slight chance of
TSRA this afternoon. Strong winds this afternoon and evening with
gust potential 30-45 kt. North winds shifting to the W/SW and
eventually S this evening. Most precip and strong winds will end
after 06Z Mon.

Valleys/Mountains/Deserts...RA/RA+ today with CIGS 030-070 lowering
to 010-020 in heavier rain bands. Slight chance of TS. Higher
terrain obscured at times. Strong east/southeast winds shifting west
this afternoon and then south this evening. Gusts of 50-70 kt over
the mountains and gusts of 40-50 kt elsewhere. Wind gusts may exceed
35 kt at PSP. Most precip and strong winds will end from south to
north 06Z-10Z Mon.

&&

.MARINE...
At 8 AM the San Clemente Basin buoy reported northeast wind 16G19
kt, and San Clemente Island reported NE winds 21G26 kt. Winds from
Hilary will increase to 20-40 kt from the NNE this morning with
local gusts to 50-55 kt mainly in the inner waters. Winds will shift
to the WSW late this afternoon, eventually becoming southerly
overnight as it weakens. Short-period steep seas of 9 to 14 feet
will occur with these winds as well.

&&

.BEACHES...
160-180 degree SSE swells from Hilary will bring high surf to south
facing beaches today into Monday. Surf on the south-facing beaches
in Orange County will be 5 to 8 feet. Strong longshore and rip
currents will occur at all San Diego and Orange County beaches
through Monday morning. There is a chance of lightning at the
beaches today.

&&

.SKYWARN...
Skywarn activation is requested through tonight. Thank you for
any reports you are able to send us, spotters, they are much
appreciated!

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Flood Watch through late tonight for Orange County Coastal Areas-
     Orange County Inland Areas-San Bernardino and Riverside
     County Valleys-The Inland Empire-San Diego County Coastal
     Areas-San Diego County Valleys-Santa Ana Mountains and
     Foothills.

     Beach Hazards Statement through Monday morning for San Diego
     County Coastal Areas.

     Tropical Storm Warning for Apple and Lucerne Valleys-Coachella
     Valley-Orange County Coastal Areas-Orange County Inland
     Areas-Riverside County Mountains-San Bernardino County
     Mountains-San Bernardino and Riverside County Valleys-The
     Inland Empire-San Diego County Coastal Areas-San Diego
     County Deserts-San Diego County Mountains-San Diego County
     Valleys-San Gorgonio Pass Near Banning-Santa Ana Mountains
     and Foothills.

     Flood Watch through Monday afternoon for Apple and Lucerne
     Valleys-Coachella Valley-Riverside County Mountains-San
     Bernardino County Mountains-San Diego County Deserts-San
     Diego County Mountains-San Gorgonio Pass Near Banning.

     High Surf Advisory until noon PDT Monday for Orange County
     Coastal Areas.

PZ...Tropical Storm Warning for Coastal Waters from San Mateo Point
     to the Mexican Border and out to 30 nm-Waters from San
     Mateo Point to the Mexican Border Extending 30 to 60 nm out
     including San Clemente Island.

&&

PUBLIC...APR
AVIATION/MARINE...Moede

In the hours before

Local storm report, Aug 20, 12:46 PM PDT, 1 hour 5 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
1246 PM PDT Sun Aug 20 2023

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

1226 PM     Non-Tstm Wnd Dmg 6 SE Big Bear Lake      34.17N 116.86W
08/20/2023                   San Bernardino     CA   Law Enforcement

            TREE DOWN BLOCKING ENTIRE DOWNHILL LNS.

&&

EMI

Local storm report, Aug 20, 12:54 PM PDT, 57 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
1254 PM PDT Sun Aug 20 2023

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

1124 AM     Non-Tstm Wnd Dmg 8 SW Warner Springs     33.22N 116.74W
08/20/2023                   San Diego          CA   Law Enforcement

            OAK TREE DOWN BLOCKING EASTBOUND LN.

&&

EMI

Local storm report, Aug 20, 1:01 PM PDT, 50 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
101 PM PDT Sun Aug 20 2023

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

1253 PM     Debris Flow      Julian                  33.08N 116.59W
08/20/2023                   San Diego          CA   Law Enforcement

            SR78 / BANNER DR, HEAVY MUD BLOCKING SB
            LANES.

&&

EMI

Local storm report, Aug 20, 1:33 PM PDT, 18 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
133 PM PDT Sun Aug 20 2023

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

0120 PM     Debris Flow      1 SSE Crestline         34.23N 117.28W
08/20/2023                   San Bernardino     CA   Law Enforcement

            SR18 RIM OF THE WORLD HIGHWAY LRG BOULDER IN
            LANES.

&&

EMI

Local storm report, Aug 20, 1:36 PM PDT, 15 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
136 PM PDT Sun Aug 20 2023

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

0123 PM     Flash Flood      Palm Springs            33.83N 116.50W
08/20/2023                   Riverside          CA   Public

            Report from mPING: Street/road flooding on
            Gene Autry Trail. Vehicles stranded.

&&

Moede

Local storm report, Aug 20, 1:38 PM PDT, 13 minutes before

Preliminary Local Storm Report
National Weather Service San Diego CA
138 PM PDT Sun Aug 20 2023

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

0128 PM     Debris Flow      SR38 ANGELUS OAKS       34.15N 116.98W
08/20/2023                   San Bernardino     CA   Law Enforcement

            ROCK DEBRIS IN ALL LANES.

&&

EMI

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 20, 8:00 AM PDT	Areal Flood Advisory	SGX	San Bernardino	12 hr
Aug 20, 8:16 AM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	2 hr
Aug 20, 8:53 AM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Aug 20, 11:04 AM PDT	Areal Flood Advisory	SGX	San Bernardino	9 hr
Aug 20, 11:17 AM PDT	Areal Flood Advisory	SGX	San Diego	6 hr
Aug 20, 11:25 AM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 12:48 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 1:04 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	3 hr
Aug 20, 1:07 PM PDT	Severe Thunderstorm Warning	SGX	Riverside, San Diego	38 min
Aug 20, 1:20 PM PDT	Areal Flood Advisory	SGX	Riverside	4 hr
Aug 20, 1:40 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	10 hr
Aug 20, 2:21 PM PDT	Areal Flood Advisory	SGX	Riverside, San Bernardino	4 hr
Aug 20, 2:58 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	5 hr
Aug 20, 3:11 PM PDT	Areal Flood Advisory	SGX	Orange, San Diego	2 hr
Aug 20, 3:37 PM PDT	Tornado Warning	SGX	San Diego	23 min
Aug 20, 3:46 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Diego	74 min
Aug 20, 4:05 PM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	2 hr

Nearby

Flash Flood Warnings in California, 2023 Every flash flood warning in 2023

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.