Severe Thunderstorm Warning 4, NWS San Diego, CA

307 
WWUS56 KSGX 252150
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
250 PM PDT Mon Aug 25 2025

CAC065-252230-
/O.CON.KSGX.SV.W.0004.000000T0000Z-250825T2230Z/
Riverside CA-
250 PM PDT Mon Aug 25 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM PDT
FOR RIVERSIDE COUNTY...

At 249 PM PDT, a severe thunderstorm was located over northeastern
Palm Springs, moving east at 5 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Palm Springs, Mt San Jacinto State Park, Cathedral City, Palm Desert,
southeastern Desert Hot Springs, Rancho Mirage, North Palm Springs,
Whitewater, Indian Wells, Sky Valley, and Thousand Palms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3365 11665 3388 11670 3394 11643 3369 11634
TIME...MOT...LOC 2149Z 266DEG 5KT 3382 11651 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KW

742 
WWUS56 KSGX 252224
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
324 PM PDT Mon Aug 25 2025

CAC065-252234-
/O.EXP.KSGX.SV.W.0004.000000T0000Z-250825T2230Z/
Riverside CA-
324 PM PDT Mon Aug 25 2025

...THE SEVERE THUNDERSTORM WARNING FOR RIVERSIDE COUNTY WILL EXPIRE
AT 330 PM PDT...

The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

&&

LAT...LON 3365 11665 3388 11670 3394 11643 3369 11634
TIME...MOT...LOC 2224Z 270DEG 18KT 3384 11639 

$$

KW

Area Forecast Discussion
National Weather Service San Diego CA
1256 PM PDT Mon Aug 25 2025

.SYNOPSIS...
Thunderstorms develop today over the mountains and deserts with
heavy rainfall rates at times potentially exceeding 1"/hr.
Afternoon monsoon thunderstorms will be possible both Tuesday and
Wednesday as well, with more constricted coverage in the
mountains. A pattern change for the latter half of the week will
limit thunderstorms after Wednesday, with more seasonable
temperatures and a deepening marine layer. By the weekend and into
early next week, a warming trend sets in and temperatures return
above normal.

&&

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

Water vapor imagery shows high pressure over the Four Corners region
today, while a deepening low spins off the coast of California.
Ample moisture pushes up into the Desert Southwest today, with PWs
exceeding 1.5" across much of Imperial County and far eastern San
Diego and Riverside counties. Widespread storms are expected to
develop beginning around noon, with flash flooding as the main
threat. Rain rates could exceed 1"/hr and some hi-res guidance shows
the possibility of 2"+/hr, especially in the Riverside and San Diego
Mountains. Outside of the flooding threat, these storms will also be
capable of very gusty winds exceeding 60 mph and downburst will
not be out of the question given higher CBs, especially for areas
further north. While less of a concern, small hail may accompany
any thunderstorm that develops. The best chances for storms today
will be in the San Diego County Mountains and Deserts, Riverside
Mountains, and Coachella Valley. With the influx of mid-level
moisture today, cloud cover already stretches from much of San
Diego County through Imperial County and into Arizona. This cloud
layer may actually limit some of the convection today, but also
plays into the available moisture that storms will have for the
afternoon.

Most of the convection should end by 6PM local time, with only a few
lingering showers and thunderstorms across the higher terrain as the
high begins to break down and elongates, with a big flux of
moisture this evening. As the aforementioned low moves closer to
the coast, thunderstorm chances will shift northward for Tuesday,
with the higher rain rates (>1"/hr) shifted towards the San
Bernardino Mountains and High Deserts for Tuesday afternoon.
Tomorrow looks like a rince-and-repeat of today, just with the
main corridor of moisture and storms shifted towards those
northern regions. By Wednesday, the low transitions to an open
trough and moves inland and monsoonal thunderstorm chances drop
for Wednesday and beyond. Temperatures through the end of the week
hold stable, just at or slightly below normal for afternoon
highs. Ample lingering moisture in the deserts and desert
foothills will limit overnight lows from cooling much through the
the end of the week, keeping things a bit warmer on the eastern
sides of the mountains. With heights falling a bit, the marine
layer will begin to deepen, making it further inland each night
after Wednesday. Weak ridging builds back in this weekend, and
temperatures look to begin to warm by Sunday.

&&

.AVIATION...
252100Z...Coast/Valleys...Mid and high level clouds AOA 10,000 ft
this afternoon. Low clouds redevelop after 04Z Tue with bases around
900-1200 ft MSL making it 15-20 miles inland by 12z. Scatter out 16-
17z.

Mountains/Deserts...+SHRA/TSRA over the mountains are occurring over
the mountains. CB bases near 10 kft and tops to 30 kft. Gusty
outflow winds higher than 35 kts, 1-3 SM vis in +RA, small hail, and
lightning are possible. 40-50% chance a TSRA could drift within 10
miles of KPSP and KTRM until 01z. CB/SHRA dissipating this evening.
More +SHRA/TSRA Tuesday afternoon, similar to today.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

PUBLIC...Zuber
AVIATION/MARINE...Westerink

Special Weather Statement
National Weather Service San Diego CA
1211 PM PDT Mon Aug 25 2025

CAZ050-058-062-252000-
San Diego County Mountains CA-San Diego County Deserts CA-
San Diego County Inland Valleys CA-
1211 PM PDT Mon Aug 25 2025

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

At 1211 PM PDT, Doppler radar was tracking a strong thunderstorm over
Cuyamaca Rancho State Park, moving north at 25 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...
Alpine, Cuyamaca Rancho State Park, Julian, Hwy 78 Between Banner And
S2, Lake Cuyamaca, Pine Valley, Hwy S1 Between Lake Cuyamaca And
Mount Laguna, Descanso, Hwy 79 Between Julian And Lake Cuyamaca,
Boulder Creek, Banner, Wynola, and Guatay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3283 11649 3284 11666 3309 11666 3308 11650
TIME...MOT...LOC 1911Z 193DEG 20KT 3290 11654

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

Westerink

Special Weather Statement
National Weather Service San Diego CA
108 PM PDT Mon Aug 25 2025

CAZ050-058-062-252100-
San Diego County Mountains CA-San Diego County Deserts CA-
San Diego County Inland Valleys CA-
108 PM PDT Mon Aug 25 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL SAN DIEGO COUNTY
THROUGH 200 PM PDT...

At 108 PM PDT, Doppler radar was tracking a strong thunderstorm near
Pine Valley, or 8 miles southwest of Mount Laguna. This thunderstorm
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...
Alpine, Cuyamaca Rancho State Park, northern Mount Laguna, I-8
Between Pine Valley And Boulevard, Pine Valley, Descanso, Hwy S1
Between Lake Cuyamaca And Mount Laguna, Campo, Guatay, and Japatul
Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3277 11666 3293 11664 3296 11647 3276 11646
      3271 11656
TIME...MOT...LOC 2008Z 287DEG 1KT 3280 11657

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

Westerink

Special Weather Statement
National Weather Service San Diego CA
119 PM PDT Mon Aug 25 2025

CAZ048-050-056-058-065-252100-
San Diego County Mountains CA-Riverside County Mountains CA-
San Gorgonio Pass Near Banning CA-
San Bernardino and Riverside County Valleys-The Inland Empire CA-
San Diego County Inland Valleys CA-
119 PM PDT Mon Aug 25 2025

...A STRONG THUNDERSTORM WILL IMPACT RIVERSIDE AND NORTH CENTRAL SAN
DIEGO COUNTIES THROUGH 200 PM PDT...

At 119 PM PDT, Doppler radar was tracking a strong thunderstorm near
East Hemet, or 7 miles southeast of Hemet. This thunderstorm 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...
Temecula, Hwy 243 Between Banning And Idyllwild, Idyllwild-Pine Cove,
Hemet, Mt San Jacinto State Park, Anza, San Jacinto, Aguanga, Valle
Vista, East Hemet, Hwy 79 Between Oak Grove And Aguanga, Hwy 74
Between Hemet And Mountain Center, Palomar Mountain, Palomar Mountain
State Park, Sage, Pauma Indian Reservation, Saboba Indian
Reservation, Oak Grove, Pala Indian Reservation, and Cahuilla Indian
Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3388 11669 3374 11674 3334 11680 3337 11702
      3369 11699 3389 11687
TIME...MOT...LOC 2019Z 134DEG 1KT 3365 11690

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

KW

Special Weather Statement
National Weather Service San Diego CA
133 PM PDT Mon Aug 25 2025

CAZ058-062-252115-
San Diego County Mountains CA-San Diego County Deserts CA-
133 PM PDT Mon Aug 25 2025

...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL SAN DIEGO COUNTY
THROUGH 215 PM PDT...

At 133 PM PDT, Doppler radar was tracking a strong thunderstorm near
Hwy S2 Vallecito Creek Rd, or 14 miles east of Mount Laguna, moving
northwest at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny 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 S2 Between Agua Caliente And Canebrake, Hwy S2 Vallecito Creek
Rd, Hwy S2 Between Canebrake And Imperial County Line, Fish Creek
Wash, Hwy S2 Between Shelter Valley And Agua Caliente, Agua Caliente,
and Canebrake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3282 11626 3297 11636 3306 11619 3291 11610
      3285 11610
TIME...MOT...LOC 2033Z 152DEG 7KT 3290 11621

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

Villafane

Special Weather Statement
National Weather Service San Diego CA
158 PM PDT Mon Aug 25 2025

CAZ048-055-056-061-065-252145-
Riverside County Mountains CA-San Gorgonio Pass Near Banning CA-
Coachella Valley CA-San Bernardino and Riverside County Valleys-
The Inland Empire CA-San Bernardino County Mountains CA-
158 PM PDT Mon Aug 25 2025

...A STRONG THUNDERSTORM WILL IMPACT RIVERSIDE COUNTY THROUGH 245 PM
PDT...

At 157 PM PDT, Doppler radar was tracking a strong thunderstorm over
Mt San Jacinto State Park. This thunderstorm was nearly stationary.

HAZARD...Wind gusts up to 50 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...
Northwestern Palm Springs, Mt San Jacinto State Park, Idyllwild-Pine
Cove, Hwy 243 Between Banning And Idyllwild, Banning, southwestern
Desert Hot Springs, Cabazon, Whitewater, North Palm Springs, Valle
Vista, Hwy 74 Between Hemet And Mountain Center, Morongo Indian
Reservation, and Saboba Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3373 11656 3374 11687 3396 11686 3395 11654
      3382 11650
TIME...MOT...LOC 2057Z 180DEG 0KT 3386 11669

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

KW