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Updated:September 18, 2025 10:30 pm PDT

Flood Advisory FLOOD ADVISORY  
San Bernardino County

  Effective: Thu, 9/18 10:26pm Severity: Minor
  Updated: September 18, 2025 10:30 pm Urgency: Expected
  Expires: Fri, 9/19 12:30am Certainty: Likely

Areas Affected: San Bernardino, CA
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues.

* WHERE...A portion of southern California, including the following
county, San Bernardino.

* WHEN...Until 1230 AM PDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
Rises in small streams and normally dry washes. Water over
roadways.

* ADDITIONAL DETAILS...
- At 1024 PM PDT, Emergency management reported heavy rain in
the advisory area due to thunderstorms, which may result in
road closures. Minor flooding is ongoing. Up to 0.75 inches
of rain fell in half an hour.
- Some locations that will experience flooding include...
Twentynine Palms, Twentynine Palms Base and Twentynine Palms
Airport.
- http://www.weather.gov/safety/flood

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Flood Advisory FLOOD ADVISORY  
San Bernardino County

  Effective: Thu, 9/18 10:27pm Severity: Minor
  Updated: September 18, 2025 10:30 pm Urgency: Expected
  Expires: Fri, 9/19 12:30am Certainty: Likely

Areas Affected: San Bernardino, CA
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues.

* WHERE...A portion of southern California, including the following
county, San Bernardino.

* WHEN...Until 1230 AM PDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
Rises in small streams and normally dry washes. Water over
roadways.

* ADDITIONAL DETAILS...
- At 1026 PM PDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Up to 0.75 inches fell within
30 minutes earlier this evening.
- Some locations that will experience flooding include...
Yucca Valley, Joshua Tree Lake Campground and Joshua Tree.
- http://www.weather.gov/safety/flood

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Flood Advisory FLOOD ADVISORY  
San Bernardino County

  Effective: Thu, 9/18 9:14pm Severity: Minor
  Updated: September 18, 2025 10:30 pm Urgency: Expected
  Expires: Thu, 9/18 11:00pm Certainty: Likely

Areas Affected: San Bernardino, CA
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues.

* WHERE...A portion of southern California, including the following
county, San Bernardino.

* WHEN...Until 1100 PM PDT.

* IMPACTS...Minor flooding in low-lying and poor drainage areas.
Rises in small streams and normally dry washes. Overflowing poor
drainage areas.

* ADDITIONAL DETAILS...
- At 914 PM PDT, Doppler radar indicated heavy rain due to
thunderstorms. Minor flooding is ongoing or expected to begin
shortly in the advisory area. Up to 2 inches of rain have
fallen.
- Additional rainfall amounts up to 0.5 inches are expected
over the area. This additional rain will result in minor
flooding.
- Some locations that will experience flooding include...
Trona, Homewood Canyon-Valley Wells and Searles Valley.
- http://www.weather.gov/safety/flood

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Flood Watch FLOOD WATCH  
San Bernardino County

  Effective: Thu, 9/18 7:47pm Severity:  Severe 
  Updated: September 18, 2025 10:30 pm Urgency: Future
  Expires: Fri, 9/19 2:00am Certainty: Possible

Areas Affected: San Bernardino County Mountains - Riverside County Mountains - San Diego County Mountains - Apple and Lucerne Valleys - Coachella Valley - San Diego County Deserts - San Gorgonio Pass Near Banning
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...A portion of Southwest California, including the following
areas, Apple and Lucerne Valleys, Coachella Valley, Riverside
County Mountains, San Bernardino County Mountains, San Diego
County Deserts, San Diego County Mountains and San Gorgonio Pass
near Banning.

* WHEN...Until 2 AM PDT Friday.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Low-water crossings may be flooded.

* ADDITIONAL DETAILS...
- Scattered showers and thunderstorms will spread northward
across the area through tonight with heaviest rainfall
through the early evening. Some thunderstorms will produce
locally heavy rainfall, which may lead to flooding. The most
likely peak hourly rainfall is around one-half inch with
isolated maximum hourly rainfall to 1 inch.
- https://www.weather.gov/safety/flood

Information:
You should monitor later forecasts and be alert for possible Flood
Warnings. Those living in areas prone to flooding should be prepared
to take action should flooding develop.

Be alert in the mountains for rockslides and rocks in the road.
Flood Watch FLOOD WATCH  
San Bernardino County

  Effective: Thu, 9/18 7:35am Severity:  Severe 
  Updated: September 18, 2025 10:30 pm Urgency: Future
  Expires: Fri, 9/19 2:00am Certainty: Possible

Areas Affected: Western Mojave Desert - Eastern Mojave Desert, Including the Mojave National Preserve - Morongo Basin - Cadiz Basin - San Bernardino County-Upper Colorado River Valley
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...A portion of southeast California, including the following
areas, Cadiz Basin, Eastern Mojave Desert, Morongo Basin, San
Bernardino County-Upper Colorado River Valley and Western Mojave
Desert.

* WHEN...Through late tonight.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Low-water
crossings may be flooded.

* ADDITIONAL DETAILS...
- http://www.weather.gov/safety/flood