Flash Flood Warning 9, NWS San Diego, CA

329 
WGUS76 KSGX 012216
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
316 PM PDT Mon Aug 1 2022

CAC065-073-012226-
/O.CAN.KSGX.FF.W.0009.000000T0000Z-220801T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-San Diego CA-
316 PM PDT Mon Aug 1 2022

...FLASH FLOOD WARNING IS CANCELLED FOR RIVERSIDE AND NORTHERN SAN 
DIEGO COUNTIES...

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

A Flood Watch remains in effect until 1000 PM PDT Monday for a 
portion of Southern California including the Riverside County 
Mountains and the San Diego County Mountains.

LAT...LON 3347 11686 3353 11674 3342 11663 3336 11658
      3332 11667

$$

Adams

Area Forecast Discussion
National Weather Service San Diego CA
834 AM PDT Mon Aug 1 2022

.SYNOPSIS...
Scattered thunderstorms will redevelop again today over the
mountains and deserts. Heavy rainfall could lead to local flash
flooding, mainly near the mountains. Building high pressure aloft
will decrease the shower activity Tuesday and Wednesday, but a
return of monsoonal flow is expected for the remainder of the week. A
shallow marine layer along the coast, coupled with higher humidity
over the Southwest much of the week, will keep daytime temperatures
at or below average, while overnight lows remain elevated. A large,
south swell has raised the rip current danger risk at area
beaches.

&&

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

Few marine clouds were reported at coastal sites this morning, but a
sheet of mid-level clouds covered a large part of the CA Bight, and
Imperial County. A few brief, light showers were occurring in Orange
County. The 12Z Miramar sounding had a some instability above 7000
FT and 1.77 inches of PW. Farther to the east, a Yuma sounding had
considerably more instability and a PW of two inches. Our mountains
lie somewhere in between these two profiles. A modification of the
Miramar sounding for heating at mountain top shows instability
closer to Yuma values (Around 900J/K). Winds aloft are favorable
for thunderstorm development...weak easterly below 10K FT, veering
SW above 25K FT to about 15 KT. No forecast changes are planned at
this time.

From previous discussion...

.SHORT TERM (Today through Wednesday)...
Slight drying will begin today with greater drying for Tuesday and
Wednesday. Scattered thunderstorms are expected once again today
from late morning through early evening for the mountains and high
desert with lesser chances for the inland valleys and lower
deserts. A Flash Flood Watch has been issued once again for today
from 10 AM to 10 PM for the mountains of San Bernardino and
Riverside Counties and for the Apple and Lucerne Valleys. Slow
moving thunderstorms will once again produce locally heavy
rainfall with the potential for flash flooding. For Tuesday
afternoon, thunderstorms are expected to be more isolated with
less rainfall with fewer or no thunderstorms for Wednesday
afternoon.

&&

.LONG TERM (Thursday through Sunday)...
Monsoonal moisture is expected to increase on Thursday into next
weekend. NBM has thunderstorm chances and rainfall potential
highest for next Sunday and Monday.

&&

.AVIATION...
011530Z...Coast/Valleys...10-15% chance of isolated SHRA/TSRA may
drift off the mountains and into the inland valleys this afternoon.
Main impact would be vis of 2-4 SM, gusty outflow winds, and locally
heavy rain. Otherwise SCT-BKN clouds at/above 8,000 ft MSL today.
Patchy low clouds along the coast will scatter through 17Z. 50%
chance of MVFR cigs at coastal TAF sites with a 45% chance of IFR
cigs at KCRQ after 09Z Tue.

Mountains/Deserts...Scattered TSRA forming again over the mountains
and High Desert by 18z with most activity diminishing by 03z Tue. CB
bases near 8,000 ft MSL with tops to 35,000 ft MSL. Vis reduced VCTY
TSRA with gusty outflow winds. Otherwise SCT-BKN clouds at/above
8,000 ft MSL through Tuesday.

&&

.MARINE...
Swell from Tropical Storm Frank will build into Tuesday, peaking
Tuesday and Wednesday with combined seas of 5-6 ft at 12-14 sec.

&&

.BEACHES...
A 4-5 foot south swell from 180-200 degrees at a period of 12-14
seconds will generate hazardous surf of 4-7 feet, mainly along south-
facing beaches. Expect strong rip and longshore currents at all
beaches through Wednesday. Highest surf will be in northern Orange
County. A Beach Hazards Statement is in effect through Wednesday
afternoon.

&&

.SKYWARN...
Skywarn activation is requested today from late morning through
early evening.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Flood Watch from 10 AM PDT this morning through this evening for
     Apple and Lucerne Valleys-Riverside County Mountains-San
     Bernardino County Mountains.

     Beach Hazards Statement through Wednesday afternoon for Orange
     County Coastal Areas-San Diego County Coastal Areas.

PZ...NONE.

&&

PUBLIC...10/17
AVIATION/MARINE/BEACHES...CO

Special Weather Statement
National Weather Service San Diego CA
1241 PM PDT Mon Aug 1 2022

CAZ060-012030-
Apple and Lucerne Valleys CA-
1241 PM PDT Mon Aug 1 2022

...A strong thunderstorm will impact portions of San Bernardino
County through 130 PM PDT...

At 1241 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles north of Pinon Hills, or 12 miles north of Hwy 2 Between Phelan
And Wrightwood, moving north at 10 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 damage to outdoor objects is
         possible.

Locations impacted include...
Adelanto, El Mirage and Phelan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3452 11749 3450 11765 3466 11766 3469 11748
TIME...MOT...LOC 1941Z 175DEG 8KT 3455 11758

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

Adams