Alert archive / California / Flash Flood Warnings in 2022

Flash Flood Warning 58, NWS San Diego, CA

September 12, 2022San Bernardino County, California

NWS San Diego, CA issued this flash flood warning at Sep 12, 2022, 1:54 PM PDT for San Bernardino County, California. It was in force for 3 hr. 5 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Sep 12, 2022, 1:54 PM PDT (20:54 UTC)
Expired: Sep 12, 2022, 5:00 PM PDT
In force: 3 hr
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County San Bernardino County, CA

What was reported inside it

Time	Report	Where	Remark
Sep 12, 2:53 PM PDT	FLASH FLOOD	4 Sw Forest Falls, CA	WEBCAMERA SHOWS LARGE MUD DEBRIS FLOW GOING DOWN BIRCH CREEK IN OAK GLEN. NEARLY 2.4 INCHES PAST HOUR ON RAYWOOD FLATS AND 1 INCH AT YUCAIPA RIDGE.
Sep 12, 3:12 PM PDT	FLASH FLOOD	13 N Lucerne Valley, CA	CHP REPORT OF FLOODING ON HIGHWAY 247, 3 VEHICLES POSSIBLY SUBMERGED.
Sep 12, 3:24 PM PDT	HEAVY RAIN 2.4	6 Nnw Forest Falls, CA	HIGHWAY 38 FULL CLOSURE. RAYWOOD FLATS WITH 2.4 INCHES IN 1 HOUR.
Sep 12, 3:38 PM PDT	FLASH FLOOD	13 N Lucerne Valley, CA	CHP ADVISING THAT PORTIONS OF HIGHWAY 247 ARE WASHING OUT.
Sep 12, 3:43 PM PDT	FLASH FLOOD	5 Sw Lenwood, CA	CHP REPORTS FLOODING IN THE AREA. LARGE AMOUNT OF MUD AND DIRT IN THE ROAD AT MAIN ST AND HINKLEY RD.

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

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 8.9 hours before the alert went out and 180 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: 25 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 2221 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 19 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 San Diego, CA wrote its last area forecast discussion before this flash flood warning went out at Sep 12, 10:00 AM PDT, 3 hours 54 minutes earlier.

Area forecast discussion, Sep 12, 10:00 AM PDT, 3 hours 54 minutes before

Area Forecast Discussion
National Weather Service San Diego CA
1000 AM PDT Mon Sep 12 2022

.SYNOPSIS...
Extensive moisture aloft will bring mostly cloudy conditions today
with a chance of thunderstorms mainly this afternoon. Locally heavy
rain and flash flooding will be possible with some thunderstorms. As
moisture decreases, only isolated thunderstorms are expected
Tuesday, with dry weather prevailed Wednesday through next weekend.
Temperatures will mostly be near normal the rest of this week, with
areas of night and morning low clouds near the coast.

&&

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

The remnant surface low of Kay was approximately 400 miles southwest
of San Diego, with extensive moisture bringing a broad cloud shield
from the low (and beyond) northeast through a lot of SoCal. A few
showers were occurring this morning. The NKX sounding this morning
had 1.67" of PW. Current SPC analysis shows rather modest surface
and MU CAPE due to the cloud cover, and any instability that could
occur due to clearing is the key to afternoon convection. If
thunderstorms form, heavy rain will be possible as HRRR runs this
morning have shown locally more than 1"/hour rates. Given the
limited clearing so far, thunderstorms will likely be delayed until
mid-late afternoon. Greatest chances, based on surface convergence,
will be in the mountains, though the HRRR indicates some risk in the
far eastern Inland Empire as well. The cloud cover today will result
in lower temperatures, and they are already about 5 deg F lower on
average than 24 hours ago. The muggy conditions will continue,
however.

A drying trend will occur Tuesday and Wednesday as we return to west
flow aloft with moderate troughing over the Pacific Northwest.
Thunderstorm chances are marginal Tuesday, with the most likely
scenario being that thunderstorms will happen only near the higher
peaks. Starting Wednesday, there should be dry weather across the
region. The westerly flow will be favorable for marine layer stratus
near the ocast, which could be extensive on some nights and even
days. Temperatures will mostly be near normal, though highs will be
a bit below normal with lows a bit above normal. Most model/ensemble
solutions show a deeping trough or upper low along the West Coast
this weekend which could bring some cooling but at this point
appears unlikely to bring precipitation.

&&

.AVIATION...
121600Z...Coast/Valleys...SCT-BKN020-030 with local CIGS 005-010 and
isolated -SHRA through 17Z. From 17Z-24Z...SCT030-050 SCT100 with
isolated TSRA, mainly in the valleys/foothills.

Mountains/Deserts...SCT030-050 BKN100 with isolated -SHRA this
morning and scattered -TSRA this afternoon with tops to 40,000 ft.

&&

.MARINE...
Isolated showers this morning. Otherwise, no hazardous marine
conditions through Thursday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Flood Watch from 11 AM PDT this morning through this evening for
     Apple and Lucerne Valleys-Riverside County Mountains-San
     Bernardino County Mountains-San Gorgonio Pass Near Banning.

PZ...None.

&&

PUBLIC...Maxwell
AVIATION/MARINE...Small

In the hours before

Local storm report, Sep 12, 1:27 PM PDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
127 PM PDT MON SEP 12 2022

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

1200 PM     HEAVY RAIN       5 NE RANCHO CUCAMONGA   34.17N 117.51W
09/12/2022  M2.83 INCH       SAN BERNARDINO     CA   MESONET

            MESONET STATION LRAC1 LARSON RANCH.

&&

AOT

Local storm report, Sep 12, 1:28 PM PDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
128 PM PDT MON SEP 12 2022

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

0700 AM     HEAVY RAIN       4 W SAN JACINTO         33.80N 117.04W
09/12/2022  M1.33 INCH       RIVERSIDE          CA   COCORAHS

            COCORAHS STATION CA-RV-58 SAN JACINTO 4.2 W.

&&

AOT

Local storm report, Sep 12, 1:29 PM PDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
129 PM PDT MON SEP 12 2022

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

0700 AM     HEAVY RAIN       2 WSW RAMONA            33.03N 116.90W
09/12/2022  M0.95 INCH       SAN DIEGO          CA   COCORAHS

            COCORAHS STATION CA-SD-186 RAMONA 1.8 WSW.

&&

AOT

Local storm report, Sep 12, 1:30 PM PDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
130 PM PDT MON SEP 12 2022

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

0115 PM     HEAVY RAIN       5 NE RAINBOW            33.46N 117.08W
09/12/2022  M0.48 INCH       RIVERSIDE          CA   MESONET

            MESONET STATION FW9212 ESCONDIDO.

&&

AOT

Local storm report, Sep 12, 1:42 PM PDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
142 PM PDT MON SEP 12 2022

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

0141 PM     HEAVY RAIN       3 NW RUNNING SPRINGS    34.24N 117.14W
09/12/2022  M2.68 INCH       SAN BERNARDINO     CA   MESONET

            HEAPS PEAK RAWS - RADAR HAD 2 TO 3 INCHES ON
            SUNDAY.

&&

AOT

Local storm report, Sep 12, 1:51 PM PDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SAN DIEGO CA
151 PM PDT MON SEP 12 2022

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

0700 AM     HEAVY RAIN       1 WNW RUNNING SPRINGS   34.21N 117.13W
09/12/2022  M3.58 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 1
            WNW RUNNING SPRINGS. MESONET STATION FW1313
            RUNNING SPRINGS 1, RADAR ESTIMATES WERE NEAR
            THIS AMOUNT.

0700 AM     HEAVY RAIN       5 NE RANCHO CUCAMONGA   34.17N 117.51W
09/12/2022  M2.83 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 5
            NE RANCHO CUCAMONGA. MESONET STATION LRAC1
            5.5 NE RANCHO CUCAMONGA.

0700 AM     HEAVY RAIN       5 NE RANCHO CUCAMONGA   34.17N 117.51W
09/12/2022  M2.83 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 5
            NE RANCHO CUCAMONGA. MESONET STATION LRAC1
            LARSON RANCH.

0700 AM     HEAVY RAIN       4 N RANCHO CUCAMONGA    34.17N 117.57W
09/12/2022  M2.75 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 4 N
            RANCHO CUCAMONGA. MESONET STATION DECC1 4.2
            N RANCHO CUCAMONGA.

0700 AM     HEAVY RAIN       3 NW RUNNING SPRINGS    34.24N 117.14W
09/12/2022  M2.68 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 3
            NW RUNNING SPRINGS. HEAPS PEAK RAWS - RADAR
            HAD 2 TO 3 INCHES ON SUNDAY.

0700 AM     HEAVY RAIN       CRESTLINE               34.24N 117.29W
09/12/2022  M2.10 INCH       SAN BERNARDINO     CA   COUNTY OFFICIAL

            CRESTLINE MAINTENANCE YARD TOTAL RAIN FROM
            WEEKEND.

0700 AM     HEAVY RAIN       3 SSW LAKE ELSINORE     33.63N 117.34W
09/12/2022  M2.09 INCH       RIVERSIDE          CA   COCORAHS

            COCORAHS STATION CA-RV-60 LAKE ELSINORE 2.8
            SSW.

0700 AM     HEAVY RAIN       4 NNE RANCHO CUCAMONGA  34.16N 117.53W
09/12/2022  M1.97 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 4
            NNE RANCHO CUCAMONGA. MESONET STATION DACC1
            3.9 NE RANCHO CUCAMONGA.

0700 AM     HEAVY RAIN       1 SSW LAKE ARROWHEAD    34.23N 117.20W
09/12/2022  M1.74 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 1
            SSW LAKE ARROWHEAD. MESONET STATION CRQC1
            1.3 S LAKE ARROWHEAD.

0700 AM     HEAVY RAIN       1 SE LAKE ARROWHEAD     34.24N 117.18W
09/12/2022  M1.52 INCH       SAN BERNARDINO     CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 1
            SE LAKE ARROWHEAD. MESONET STATION FW0025
            LAKE ARROWHEAD SOUTH.

0429 AM     HEAVY RAIN       5 WNW RANCHO CUCAMONGA  34.14N 117.65W
09/12/2022  M1.35 INCH       SAN BERNARDINO     CA   COCORAHS

            COCORAHS STATION CA-SR-53 UPLAND 1.8 NNE.

0700 AM     HEAVY RAIN       4 W SAN JACINTO         33.80N 117.04W
09/12/2022  M1.33 INCH       RIVERSIDE          CA   COCORAHS

            COCORAHS STATION CA-RV-58 SAN JACINTO 4.2 W.

0700 AM     HEAVY RAIN       5 WSW LAKE ELSINORE     33.65N 117.41W
09/12/2022  M1.28 INCH       RIVERSIDE          CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 5
            WSW LAKE ELSINORE. MESONET STATION ECSC1 EL
            CARISO RAWS.

0500 AM     HEAVY RAIN       1 W LAKE ELSINORE       33.67N 117.33W
09/12/2022  M0.99 INCH       RIVERSIDE          CA   CO-OP OBSERVER

            CO-OP OBSERVER STATION EORC1 LAKE ELSINORE.

0700 AM     HEAVY RAIN       2 WSW RAMONA            33.03N 116.90W
09/12/2022  M0.95 INCH       SAN DIEGO          CA   COCORAHS

            COCORAHS STATION CA-SD-186 RAMONA 1.8 WSW.

1026 AM     HEAVY RAIN       CAMPO                   32.63N 116.47W
09/12/2022  M0.87 INCH       SAN DIEGO          CA   MESONET

            MESONET STATION CMFC1 CAMPO.

0520 PM     HEAVY RAIN       2 NE MURRIETA           33.58N 117.18W
09/11/2022  M0.64 INCH       RIVERSIDE          CA   TRAINED SPOTTER

            MAJOR THUNDERSTORM STRUCK HERE IN MURRIETA,
            WITH HEAVY RAIN, WIND, THUNDER AND LIGHTNING
            (VERY FREQUENT) FROM 4:51 PM TO 5:18 PM.
            TEMPORARY STREET FLOODING OCCURRED, NO OTHER
            KNOWN DAMAGE. 0.64 INCHES WAS RECORDED AT MY
            LOCATION NEAR I-215 AND LOS ALAMOS ROAD.
            DAVIS INSTRUMENTS VANTAGE PRO 2. TOTAL
            CONFIRMED VIA MANUAL RAIN GAUGE ON-SITE.
            PICTURES AND SCREENSHOTS OF RAW DATA
            AVAILABLE IF NEEDED. -.

1252 PM     HEAVY RAIN       5 E ALPINE              32.84N 116.67W
09/12/2022  M0.64 INCH       SAN DIEGO          CA   MESONET

            MESONET STATION ANEC1 ALPINE RAWS.

0153 PM     HAIL             5 WNW PINE VALLEY       32.85N 116.60W
09/11/2022  M0.50 INCH       SAN DIEGO          CA   PUBLIC

            CORRECTS PREVIOUS HAIL REPORT FROM 5 WNW
            PINE VALLEY. REPORT FROM MPING: HALF-INCH
            HAIL (0.50 IN.).

0202 PM     HAIL             5 W PINE VALLEY         32.84N 116.61W
09/11/2022  U0.50 INCH       SAN DIEGO          CA   PUBLIC

            REPORT FROM MPING: HALF-INCH (0.50 IN.).

0510 PM     HEAVY RAIN       2 N MURRIETA            33.59N 117.21W
09/11/2022  E0.50 INCH       RIVERSIDE          CA   TRAINED SPOTTER

            RIV 344 RECEIVED 1.5 RISE OF POOL ELEVATION
            IN 20 MINUTES TIME.

0115 PM     HEAVY RAIN       5 NE RAINBOW            33.46N 117.08W
09/12/2022  M0.48 INCH       RIVERSIDE          CA   MESONET

            MESONET STATION FW9212 ESCONDIDO.

0700 AM     HEAVY RAIN       8 S CORONA              33.75N 117.54W
09/12/2022  M0.43 INCH       ORANGE             CA   MESONET

            CORRECTS PREVIOUS HEAVY RAIN REPORT FROM 8 S
            CORONA. MESONET STATION SDOC1 SILVERADO
            CANYON.

0300 PM     FLASH FLOOD      3 S RAMONA              32.99N 116.87W
09/11/2022                   SAN DIEGO          CA   TRAINED SPOTTER

            PORTIONS OF WILDCAT CANYON ROAD ON THE
            BARONA RESERVATION UNDER 3-10 INCHES OF
            RUNNING WATER DUE TO HEAVY RAINFALL. VISIBLE
            REDUCED TO 1/4 MILE DURING RAIN. PHOTOS AND
            VIDEO SHARED. FLOODING WAS WIDESPREAD AND
            IMPACTED ROADWAYS. RADAR ESTIMATED UP TO 2.5
            INCHES MAXIMUM AND WIDESPREAD 1 TO 1.5
            INCHES OF RAINFALL.

0410 PM     FLASH FLOOD      4 SE HEMET              33.70N 116.92W
09/11/2022                   RIVERSIDE          CA   EMERGENCY MNGR

            HEAVY RAIN CAUSING MUD TO FLOW OVER ROADS IN
            AVERY CANYON. TIME ESTIMATED.

0431 PM     FLOOD            5 S HEMET               33.67N 116.97W
09/11/2022                   RIVERSIDE          CA   DEPT OF HIGHWAYS

            CHP REPORT OF ROADWAY FLOODING AT STATE ST
            AND CACTUS VALLEY RD.

0521 PM     DEBRIS FLOW      6 NE THOUSAND PALMS     33.87N 116.30W
09/11/2022                   RIVERSIDE          CA   DEPT OF HIGHWAYS

            LARGE ROCKS AND WATER IN THE ROAD.

0530 PM     DEBRIS FLOW      3 W LAKE ELSINORE       33.66N 117.38W
09/11/2022                   RIVERSIDE          CA   DEPT OF HIGHWAYS

            ROAD IS COVERED IN MUD, ROCKS AND WATER.

0550 PM     DEBRIS FLOW      RUNNING SPRINGS         34.21N 117.12W
09/11/2022                   SAN BERNARDINO     CA   PUBLIC

            MUD FLOWING DOWN THE STREET NEAR THE CHP
            STATION.

0609 PM     DEBRIS FLOW      2 ESE CRESTLINE         34.23N 117.26W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            CALTRANS REPORTS MUD IN THE ROAD ON BERNARD
            DRIVE.

0609 PM     DEBRIS FLOW      LAKE ARROWHEAD          34.24N 117.19W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            MUD SLIDE ON ROAD, ROAD IS BLOCKED. ROCKS
            AND CHUNKS OF WOOD IN THE ROAD.

0632 PM     DEBRIS FLOW      4 NW CRESTLINE          34.28N 117.36W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            LARGE BOULDERS IN THE ROADWAY.

0636 PM     FLASH FLOOD      1 S CRESTLINE           34.23N 117.30W
09/11/2022                   SAN BERNARDINO     CA   TRAINED SPOTTER

            HIGHWAY 18 BETWEEN WATERMAN CANYON AND
            HIGHWAY 138, HEAVY RAIN CURRENTLY, DEBRIS
            FLOWS INCLUDING BOULDERS OF UP TO 1 FT
            DIAMETER ACROSS ALL LANES. WATER SEVERAL
            INCHES DEEP FLOWING ACROSS LANES.

0643 PM     DEBRIS FLOW      1 WNW RUNNING SPRINGS   34.22N 117.13W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            BOULDERS IN LANES ON HWY 18 ON THE UPBOUND
            SIDE.

0643 PM     DEBRIS FLOW      2 W CRESTLINE           34.25N 117.33W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            LARGE ROCK BLOCKING ROAD.

0644 PM     FLASH FLOOD      5 NNE RIALTO            34.16N 117.33W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            CORRECTS PREVIOUS FLOOD REPORT FROM 5 NNE
            RIALTO. HEAVY FLOODING REPORTED ACROSS ALL
            LANES ON I-215 NORTHBOUND.

0645 PM     FLOOD            3 NNW SAN BERNARDINO    34.14N 117.31W
09/11/2022                   SAN BERNARDINO     CA   DEPT OF HIGHWAYS

            FLOODING ACROSS ALL LANES FROM UNIVERSITY
            PKWY TO MT. VERNON AVE.

0730 PM     FLOOD            1 NNW DEVORE            34.24N 117.41W
09/11/2022                   SAN BERNARDINO     CA   TRAINED SPOTTER

            SKYWARN SBD795 - GLASS TUBE RAIN GAUGE
            RECORDED 0.70 INCHES OF RAIN IN THE HOUR
            SPANNING 6:30 AND 7:30 PM. HEAVY
            THUNDERSTORM, VERY PREVALENT LIGHTNING,
            THUNDER AND LOW HANGING SCUD CLOUDS.
            ELSEWHERE, BROTHER REPORTED FLASH FLOODING
            ON UNIVERSITY PKWY AND KENDALL DR - APPROX
            ONE FOOT OF WATER COVERING THE ROADWAY.

&&

TARDY

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 5:05 PM PDT	Areal Flood Advisory	SGX	Orange, Riverside	115 min
Sep 11, 5:24 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Orange, Riverside	3 hr
Sep 11, 5:41 PM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Sep 11, 5:59 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 11, 6:10 PM PDT	Flash Flood Warning	SGX	San Bernardino	3 hr
Sep 11, 6:30 PM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Sep 11, 6:44 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 11, 6:47 PM PDT	Areal Flood Advisory	SGX	San Bernardino	118 min
Sep 12, 2:46 AM PDT	Flood Watch	SGX	Riverside, San Bernardino	17 hr
Sep 12, 1:27 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	5 hr
Sep 12, 1:34 PM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Sep 12, 1:45 PM PDT	Severe Thunderstorm Warning	SGX	San Bernardino	45 min
Sep 12, 2:04 PM PDT	Areal Flood Advisory	SGX	San Bernardino	116 min
Sep 12, 2:10 PM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Sep 12, 2:27 PM PDT	Areal Flood Advisory	SGX	San Bernardino	2 hr
Sep 12, 2:37 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	3 hr
Sep 12, 3:04 PM PDT	Special Weather Statement	SGX		41 min
Sep 12, 3:06 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 12, 3:23 PM PDT	Special Weather Statement	SGX	Orange	52 min
Sep 12, 3:30 PM PDT	Areal Flood Advisory	SGX	San Diego	3 hr
Sep 12, 3:38 PM PDT	Areal Flood Advisory	SGX	Orange, Riverside	2 hr
Sep 12, 3:51 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside	3 hr
Sep 12, 4:03 PM PDT	Flash Flood Warning Considerable damage threat	SGX	San Bernardino	3 hr
Sep 12, 4:43 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Bernardino	3 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.