Flash Flood Warning 5, NWS San Diego, CA

181 
WGUS76 KSGX 040213
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
713 PM PDT Tue Jun 3 2025

CAC065-071-040223-
/O.EXP.KSGX.FF.W.0005.000000T0000Z-250604T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Bernardino CA-
713 PM PDT Tue Jun 3 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM PDT THIS EVENING FOR 
RIVERSIDE AND SAN BERNARDINO COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

&&

LAT...LON 3400 11779 3400 11777 3402 11777 3402 11773
      3418 11767 3415 11736 3410 11716 3391 11728
      3399 11779

$$

PS

Area Forecast Discussion...CORRECTED
National Weather Service San Diego CA
300 PM PDT Tue Jun 3 2025

.SYNOPSIS...
A low pressure system will bring a chance of showers and
thunderstorms for this afternoon into tonight across Southern
California and the coastal waters, decreasing late tonight. There
is a slight chance for showers and thunderstorms on Wednesday
afternoon, mainly for the mountains. Drier with a warming trend
for Thursday into the weekend with high temperatures for Sunday
and Monday around 4 to 8 degrees above average for inland areas.
Dry and warm conditions continue into early next week.

&&

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

This afternoon...Organized bands of showers and tstms have
developed over the San Bernardino Mountains and over the coastal
waters about 10 miles east of San Clemente Island. These bands are
likely to shift south and east as the closed upper low continues
to move in that direction. The convective cells will continue to
move northwest with the flow around the upper low. This will
bring ISOLD-SCT showers and tstms to the mountains and slight
chances for showers/tstms elsewhere. Thunderstorms could produce
locally gusty winds, small hail, lightning and periods of locally
heavy rain. Minor flooding will be possible in those areas that
experience heavy rain. The marine layer low clouds are clearing
but could return late tonight.

From previous discussion...
The closed upper low will continue to move south and east through
tonight, becoming an open wave over AZ by late Wednesday morning.
It will produce chances for SCT/ISOLD showers/tstms across all
parts of SoCal into early Wed morning. Residual moisture and
daytime heating could maintain chances for showers/tstms over the
mtns again Wed afternoon.

Some high-resolution WRF models show rainfall totals of as much
as 2-3 inches in the mountains while others show around 1 to 1.5
inches. NBM probabilities for one-half inch of rainfall is as
much as 30 percent for portions of the San Bernardino County
mountains and adjacent desert areas with isolated locations with
around a 10 percent chance for one-inch or more of rainfall.
Shower and thunderstorms are expected to decrease late tonight
with a slight chance of showers and thunderstorms on Wednesday
afternoon, mainly in the mountains.

High temperatures for today and Wednesday will be mostly a few to
around 5 degrees below average with Thursday a few degrees warmer
with drying. Warm and dry weather with seasonal marine layer low
clouds and fog during the nights and mornings will continue into
early next week under broad low pressure troughing.

&&

.AVIATION...
032100Z....Coasts/Valleys...Low clouds look to surge back inland
after 00Z initially across San Diego County, eventually spreading
northward into Orange County and the Inland Empire overnight into
Wednesday, with similar coverage/timing and cloud bases as this
morning, at roughly around 1000 ft MSL for the coastal areas, to
around 1500 ft MSL inland. There will be a 30% chance of
thunderstorms until 09Z late this evening. Any thunderstorm could
produce gusty, erratic winds to 25 knots or locally greater,
dangerous cloud-to-ground lightning, and small hail.

.Mountains/Deserts...VFR conditions with SCT to BKN clouds AOA
10000 feet MSL with -SHRA and TSRA is expected. A chance of
thunderstorms will continue to be possible through 09Z, with the
highest chance of 30-60% from 00-06Z. Any thunderstorm could
produce gusty, erratic winds to 40 knots, lightning, and hail up
to half an inch in diameter.

&&

.MARINE...
An unstable weather system will bring a chance of thunderstorms to
the coastal waters through tonight, most likely this evening. Any
thunderstorm could produce gusty, erratic winds of 34 knots or
greater, lightning, small hail, and/or a waterspout. A Marine
Weather Statement contains more details.

No additional hazardous marine conditions are expected Wednesday
through Saturday.

&&

.BEACHES...
Elevated surf of 3 to 5 feet with sets to 6 feet are expected for
the rest of today, primarily for south to southwest facing beaches.
Also, there is a chance of thunderstorms that could produce
lightning through early tonight. A Beach Hazards Statement has the
details.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through late tonight for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

PUBLIC...PG
AVIATION/MARINE/BEACHES...Westerink

Special Weather Statement
National Weather Service San Diego CA
244 PM PDT Tue Jun 3 2025

CAZ048-055-032230-
San Bernardino and Riverside County Valleys-The Inland Empire CA-
San Bernardino County Mountains CA-
244 PM PDT Tue Jun 3 2025

...A STRONG THUNDERSTORM WILL IMPACT SAN BERNARDINO AND RIVERSIDE
COUNTIES THROUGH 330 PM PDT...

At 244 PM PDT, Doppler radar was tracking a strong thunderstorm over
Fontana, moving west at 40 mph.

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 hail damage to vegetation is
         possible.

Locations impacted include...
Riverside, San Bernardino, Fontana, Ontario, Rialto, Chino, Redlands,
Yucaipa, Pomona, Rancho Cucamonga, Chino Hills, Upland, Highland,
Colton, Montclair, Loma Linda, Muscoy, Mentone, Rubidoux, and Hiwy
330 Between San Bernardino And Running Springs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3401 11778 3401 11777 3402 11776 3402 11774
      3414 11769 3417 11767 3416 11718 3401 11709
      3400 11778
TIME...MOT...LOC 2144Z 084DEG 35KT 3409 11742

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

APR