Flash Flood Warning 12, NWS San Diego, CA

260 
WGUS76 KSGX 090000
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
500 PM PDT Mon Aug 8 2022

CAC065-090145-
/O.CON.KSGX.FF.W.0012.000000T0000Z-220809T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
500 PM PDT Mon Aug 8 2022

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM PDT THIS 
EVENING FOR RIVERSIDE COUNTY...

At 500 PM PDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Idyllwild-Pine Cove, Anza, Mt San Jacinto State Park, Hwy 243 
  Between Banning And Idyllwild, Mountain Center, Hwy 74 Between 
  Mountain Center And Anza, Hwy 74 Between Hemet And Mountain 
  Center, Hwy 74 Between Anza And Palm Desert, Whitewater, Valle 
  Vista, Cabazon, Lake Hemet, Cahuilla Indian Reservation, Saboba 
  Indian Reservation and Santa Rosa Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid flooded 
areas.

&&

LAT...LON 3392 11659 3354 11638 3347 11676 3388 11690

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

$$

SS

933 
WGUS76 KSGX 090140
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
640 PM PDT Mon Aug 8 2022

CAC065-090150-
/O.EXP.KSGX.FF.W.0012.000000T0000Z-220809T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
640 PM PDT Mon Aug 8 2022

...FLASH FLOOD WARNING WILL EXPIRE AT 645 PM PDT THIS EVENING FOR 
RIVERSIDE COUNTY...

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

LAT...LON 3392 11659 3354 11638 3347 11676 3388 11690

$$

SS

Area Forecast Discussion
National Weather Service San Diego CA
144 PM PDT Mon Aug 8 2022

.SYNOPSIS...
Chance of thunderstorms each afternoon and early evening this week.
Highest chances will be in the mountains, deserts, and portions of
the inland valleys. Mountain locations will have the highest chance
of heavy rainfall potentially leading to flash flooding. Otherwise,
temperatures will be near to slightly above average with periods of
night and morning low clouds at the coast and periods of high
clouds.

&&

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

Forecast Highlights:
*Chance of showers and thunderstorms each afternoon and early
evening this week in mountains, deserts, and locally in inland
valleys.
*Mountains will have the best chance of heavy rain leading to
localized flash flooding.

A few thunderstorms have developed near the desert slopes of the San
Bernardino mountains and there is a line of thunderstorms
approaching the low deserts from the east as of 130 PM. Showers
and thunderstorms are expected to continue to develop through the
afternoon, mainly in the mountains and deserts. Main impacts
with these storms are localized flash flooding, gusty winds,
lightning, and blowing dust in the deserts. Southeast to easterly
mid- level flow will continue to bring monsoonal moisture into
Southern California through much of the forecast period. This will
allow for thunderstorm development each afternoon and early
evening for the rest of the week.

Global ensembles are continuing to show precipitable water remaining
elevated into Tuesday. Thunderstorm coverage is expected to be a
little greater on Tuesday compared to today. Highest chances are in
the mountains and deserts. Thunderstorm chances decrease into
Wednesday, before increasing again Thursday and Friday. ECMWF
ensemble is showing another precipitable water peak on Friday,
with roughly a quarter of the members for Thermal showing values
of 2 inches. Global models are also showing a more easterly flow
in the mid-level winds. This increases the chance of thunderstorms
west of the mountains and increases the risk for flash flooding
in the mountains. Shower and thunderstorm chances decrease
Saturday into early next week, with highest chances remaining
confined to the mountains.

Otherwise, high temperatures this week will have minor day to day
fluctuations. Periods of patchy low clouds will develop along the
coast each night and morning. Periods of high clouds expected each
day.

&&

.AVIATION...
082030Z...Coast...SCT-BKN clouds AOA 15000 feet MSL through Tuesday.
After 06Z tonight...patchy and intermittent cigs 500-800 feet MSL
and local vis 2-5SM through 15Z Tuesday.

Elsewhere...SCT-BKN clouds AOA 15000 feet MSL through Tuesday.
Through 02Z this evening...SCT TSRA with CB bases 8000-10000 feet
and tops to 35000 feet, mainly over mountains and high desert, with
less chance over lower deserts and near zero chance in valleys.
Around any TSRA, expect gusty and erratic winds with strong
up/downdrafts, frequent lightning and heavy downpours. Similar TSRA
conditions after 18Z Tuesday.

&&

.MARINE...
No hazardous marine conditions are expected through Saturday.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.
&&

PUBLIC...CO
AVIATION/MARINE...MM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
255 PM PDT MON AUG 8 2022

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

0238 PM     DEBRIS FLOW      6 N BIG BEAR CITY       34.35N 116.85W
08/08/2022                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CHP REPORT OF MUD AND WATER ACROSS BOTH
            LANES OF HIGHWAY 18. RADAR ESTIMATES OF ONE
            HOUR RAINFALL BETWEEN ONE-QUARTER TO
            ONE-HALF INCH IN THIS AREA.

&&

SS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
321 PM PDT MON AUG 8 2022

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

0258 PM     FLOOD            1 NW LUCERNE VALLEY     34.46N 116.96W
08/08/2022                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            CHP REPORT OF VAN STUCK IN FLOOD WATER ON
            RABBIT SPRINGS RD IN LUCERNE VALLEY. RADAR
            ESTIMATES AROUND 1 INCH OF RAIN WITH THE
            STORM IN THIS AREA.

&&

SS