Flash Flood Warning 7, NWS San Diego, CA

391 
WGUS76 KSGX 112302 RRA
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
Issued by National Weather Service Los Angeles/Oxnard CA
402 PM PDT Tue Aug 11 2026

CAC073-112312-
/O.EXP.KSGX.FF.W.0007.000000T0000Z-260811T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
402 PM PDT Tue Aug 11 2026

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHEASTERN SAN DIEGO
COUNTY...

The heavy rain has moved out of the area. However, additional
isolated showers are possible in the next few hours. Please continue
to heed remaining road closures and keep in mind that mudslides and
rockslides can occur many hours after the rain has ended.

&&

LAT...LON 3319 11669 3329 11671 3334 11663 3328 11660
      3328 11651 3324 11650 3318 11662

$$

Cohen/Lund

Area Forecast Discussion
National Weather Service San Diego CA
1214 PM PDT Tue Aug 11 2026

.SYNOPSIS...
Another round of monsoon thunderstorms is expected for the mountains
on Tuesday with locally heavy rainfall rates. An isolated storm or
two may pop up over the mountains again Wednesday, but otherwise
drier conditions are expected for late week into the weekend. A
cooling trend will bring below normal temperatures to the region
from Wednesday onward along with breezy conditions for the mountains
and deserts. For the coastal basin, the marine layer is expected
to deepen each day through the weekend.

&&

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

Today through tomorrow night...

Recycled monsoonal moisture is continuing to stream up over the
region out of the southeast around the high positioned over the
desert southwest. Given the amount of instability and abundance of
moisture, there will be around a 40 to 50 percent chance of
afternoon showers and thunderstorms developing, with the San
Bernardinos mostly at play. Some of these storms will be capable of
producing rainfall rates of 0.50 inches per hour. Expect that some
of these storms will also produce strong and gusty winds due to
outflows and high DCAPE values exceeding 1000 J/kg. There could also
be some small hail associated with these storms. This will continue
into the evening hours, with storms beginning to move towards the
northeast by later in the day as mid-level flow begins to shift to
being more out of a southwesterly direction. There may also be
some isolated areas of flash flooding as a result of the storms,
as they may rapidly intensity along the mountain/desert interface,
especially where there are currently some SBCAPE values of 4000
J/kg, with temperatures/dews of low 90s over low 70s within the
Coachella Valley. These showers and storms will likely make their
way into the high deserts with skies continuing to clear as these
showers/storms dissipate and move out of the CWA. The marine layer
will be rather dispersed and then fill back in by late into the
night. As troughing continues to influence the region from
upstream, with should allow bases to slightly rise into the
morning hours tomorrow.

Thursday through Wednesday...

Troughing from upstream will continue to influence the region with
gradually cooling temperatures through the end of the week, and
temperatures becoming as much as 10 degrees below the seasonal
average for some areas. This will also increase surface gusty winds,
especially during the afternoon for the high deserts, and mountain
canyons/passes by later in the week, with gusts approaching 60 mph
within Gorgonio Pass. There will also become more persistence with
onshore flow, with the marine layer becoming more prevalent
overnight and into the morning hours. Going into early next week,
ensembles reflect a breakdown of the troughing over the E Pacific
waters and thus a return to more seasonal temperatures, while
remaining dry.

&&

.AVIATION...
101800Z....Coast/Valleys...Ongoing high cu AOA 20,000ft MSL through
Wednesday. VFR through this evening before low clouds develop again
tonight. Bases will be slightly higher, likely 1200-1500ft MSL after
03z Wed. Bases may lift from closer to 1000 to around 1500 MSL
through 12z, and will spread up to 20 miles inland. Intermittent
CIGs possible at inland TAF sites, KONT and KSBD between 12-15z. Low
chances (10%) of impacts at inland TAF sites from nearby TSRA.

.Mountains/Deserts...Scattered TSRA over mountains and
locally in deserts through this evening. Bases around 9000ft MSL
with tops to 50000 feet with any storm. Any TSRA could produce
lightning, strong up/downdrafts and associated VIS reductions.
Otherwise, SCT-BKN clouds mostly above 15,000ft MSL through today.

&&

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

&&

.BEACHES...
High tides will exceed 7 feet this evening and again Wednesday
evening between 800-930 PM, resulting in minor tidal overflow of low-
lying areas along the beach. Surf will be low and is not expected to
add much to the flooding potential. Check the Coastal Flood Advisory
for details.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory until 11 PM PDT Wednesday for Orange
     County Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

PUBLIC...Stewey
AVIATION/MARINE/BEACHES...SZ

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
142 PM PDT Tue Aug 11 2026

CAZ056-061-112115-
Riverside County Mountains CA-Coachella Valley CA-
142 PM PDT Tue Aug 11 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL RIVERSIDE COUNTY
THROUGH 215 PM PDT...

At 142 PM PDT, Doppler radar was tracking a strong thunderstorm over
Hwy 74 Between Anza And Palm Desert, or 11 miles east of Anza. This
storm was nearly stationary.

HAZARD...Wind gusts of 50 to 55 mph and half inch 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...
Hwy 74 Between Anza And Palm Desert...
and Santa Rosa Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3362 11651 3362 11640 3350 11642 3352 11654
TIME...MOT...LOC 2042Z 014DEG 1KT 3358 11647

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Cohen

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
146 PM PDT Tue Aug 11 2026

CAZ056-058-061-062-112115-
San Diego County Mountains CA-San Diego County Deserts CA-
Riverside County Mountains CA-Coachella Valley CA-
146 PM PDT Tue Aug 11 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN RIVERSIDE AND
NORTHEASTERN SAN DIEGO COUNTIES THROUGH 215 PM PDT...

At 145 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Hwy S22 Between Borrego Springs And Imperial County
Line, or 12 miles northeast of Borrego Springs. This storm was nearly
stationary, but drifting slowly to the south and southeast.

HAZARD...Wind gusts of 50 to 55 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...
Santa Rosa Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3345 11627 3350 11619 3344 11612 3337 11616
      3337 11626
TIME...MOT...LOC 2045Z 332DEG 4KT 3341 11620

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

Black/Cohen

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
201 PM PDT Tue Aug 11 2026

CAZ058-112130-
San Diego County Mountains CA-
201 PM PDT Tue Aug 11 2026

...STRONG THUNDERSTORMS WILL IMPACT SOUTHEASTERN SAN DIEGO COUNTY
THROUGH 230 PM PDT...

At 201 PM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles southwest of Boulevard to near I-8
Between Pine Valley And Boulevard. Movement was 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 hail damage to vegetation is
         possible.

Locations impacted include...
I-8 Between Pine Valley And Boulevard...
Southwestern Boulevard...
Campo...
Tierra Del Sol...
Campo Indian Reservation...
La Posta Indian Reservation...
Live Oak Springs...
and Manzanita Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3278 11647 3279 11636 3260 11629 3259 11641
      3259 11645
TIME...MOT...LOC 2101Z 183DEG 8KT 3259 11637 3277 11642

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

Cohen

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
225 PM PDT Tue Aug 11 2026

CAZ056-058-062-112200-
San Diego County Mountains CA-San Diego County Deserts CA-
Riverside County Mountains CA-
225 PM PDT Tue Aug 11 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL RIVERSIDE AND
NORTH CENTRAL SAN DIEGO COUNTIES THROUGH 300 PM PDT...

At 225 PM PDT, Doppler radar was tracking a strong thunderstorm near
Warner Springs, or 15 miles west of Borrego Springs. This storm was
nearly stationary.

HAZARD...Wind gusts of 50 to 55 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...
Southeastern Anza...
Warner Springs...
Hwy 74 Between Anza And Palm Desert...
Borrego Palm Canyon...
Hwy 79 Between Warner Springs And Oak Grove...
Hwy 79 Between Santa Ysabel And Warner Springs...
Los Coyotes Indian Reservation...
Cahuilla Indian Reservation...
and Santa Rosa Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3359 11646 3353 11640 3343 11653 3332 11646
      3326 11652 3327 11667 3338 11671 3349 11673
TIME...MOT...LOC 2125Z 050DEG 2KT 3332 11658

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

Black/Cohen

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
240 PM PDT Tue Aug 11 2026

CAZ058-112215-
San Diego County Mountains CA-
240 PM PDT Tue Aug 11 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN SAN DIEGO COUNTY
THROUGH 315 PM PDT...

At 240 PM PDT, Doppler radar was tracking a strong thunderstorm over
Warner Springs, or 13 miles north of Julian, moving west at 5 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch 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...
Warner Springs...
Hwy 79 Between Santa Ysabel And Warner Springs...
Hwy 79 Between Warner Springs And Oak Grove...
Hwy S2 Between Hwy 79 And Hwy 78...
and Los Coyotes Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3333 11662 3324 11656 3320 11667 3329 11672
TIME...MOT...LOC 2140Z 069DEG 5KT 3326 11666

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Cohen

Special Weather Statement
National Weather Service San Diego CA
Issued by National Weather Service OXNARD CA
242 PM PDT Tue Aug 11 2026

CAZ058-062-112215-
San Diego County Mountains CA-San Diego County Deserts CA-
242 PM PDT Tue Aug 11 2026

...A STRONG THUNDERSTORM WILL IMPACT CENTRAL SAN DIEGO COUNTY THROUGH
315 PM PDT...

At 242 PM PDT, Doppler radar was tracking a strong thunderstorm over
Hwy 79 Between Julian And Lake Cuyamaca, or near Julian. This storm
was nearly stationary.

HAZARD...Wind gusts of 50 to 55 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...
Hwy 78 Between Banner And S2...
Julian...
Cuyamaca Rancho State Park...
Lake Cuyamaca...
Hwy S1 Between Lake Cuyamaca And Mount Laguna...
Hwy 79 Between Julian And Lake Cuyamaca...
Hwy S2 Between Hwy 79 And Hwy 78...
Banner...
and Wynola.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3295 11650 3296 11662 3312 11662 3312 11650
TIME...MOT...LOC 2142Z 182DEG 1KT 3304 11655

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

Lund/Cohen/Dumas