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San Bernardino County Alerts
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Updated:December 23, 2025 12:46 am PST

High Wind Warning HIGH WIND WARNING  
San Bernardino County

  Effective: Mon, 12/22 6:37pm Severity:  Severe 
  Updated: December 23, 2025 12:46 am Urgency: Expected
  Expires: Tue, 12/23 6:15am Certainty: Likely

Areas Affected: San Bernardino County Mountains - Apple and Lucerne Valleys
 
Alert Details:
* WHAT...South winds 25 to 35 mph with gusts up to 60 mph expected.
Isolated gusts to 75 mph.

* WHERE...Apple and Lucerne Valleys and San Bernardino County
Mountains. Strongest winds along the desert slopes of the
mountains and adjacent desert foothills.

* WHEN...From noon Tuesday to 3 PM PST Thursday.

* IMPACTS...Damaging winds could blow down trees and power lines.
Power outages are possible. Travel will be difficult, especially
for high profile vehicles.

Information:
Watch for falling debris and tree limbs. Use caution if you must
drive.
Wind Advisory WIND ADVISORY  
San Bernardino County

  Effective: Mon, 12/22 6:37pm Severity:  Moderate 
  Updated: December 23, 2025 12:46 am Urgency: Expected
  Expires: Tue, 12/23 6:15am Certainty: Likely

Areas Affected: San Diego County Coastal Areas - San Bernardino and Riverside County Valleys-The Inland Empire - San Diego County Inland Valleys - Santa Ana Mountains and Foothills - Orange County Coastal - Orange County Inland
 
Alert Details:
* WHAT...South winds 15 to 25 mph with gusts 30 to 40 mph expected.

* WHERE...Orange County Coastal Areas, Orange County Inland Areas,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Coastal Areas, San Diego County Valleys, and Santa
Ana Mountains and Foothills.

* WHEN...From 3 AM to 10 PM PST Wednesday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

* ADDITIONAL DETAILS...Strongest winds for Orange County and the
Inland Empire will be in the morning to early afternoon. Strongest
winds for San Diego county will be mid to late morning into the
evening.

Information:
Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.
Flood Watch FLOOD WATCH  
San Bernardino County

  Effective: Tue, 12/23 12:13am Severity:  Severe 
  Updated: December 23, 2025 12:46 am Urgency: Future
  Expires: Tue, 12/23 2:00pm Certainty: Possible

Areas Affected: Lake Havasu and Fort Mohave - Northwest Deserts - Lake Mead National Recreation Area - Owens Valley - Death Valley National Park - Western Mojave Desert - Eastern Mojave Desert, Including the Mojave National Preserve - Morongo Basin - Cadiz Basin - San Bernardino County-Upper Colorado River Valley - Northeast Clark County - Western Clark and Southern Nye County - Spring Mountains-Red Rock Canyon - Las Vegas Valley - Lake Mead National Recreation Area - Southern Clark County
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...Portions of northwest Arizona, including the following
areas, Lake Havasu and Fort Mohave, Lake Mead National Recreation
Area and Northwest Deserts, southeast California, including the
following areas, Cadiz Basin, Death Valley National Park, Eastern
Mojave Desert, Morongo Basin, Owens Valley, San Bernardino
County-Upper Colorado River Valley and Western Mojave Desert, and
southern Nevada, including the following areas, Lake Mead National
Recreation Area, Las Vegas Valley, Northeast Clark County,
Southern Clark County, Spring Mountains-Red Rock Canyon and
Western Clark and Southern Nye County.

* WHEN...From late tonight through late Wednesday night.

* 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

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.
Flood Watch FLOOD WATCH  
San Bernardino County

  Effective: Mon, 12/22 9:31pm Severity:  Severe 
  Updated: December 23, 2025 12:46 am Urgency: Future
  Expires: Tue, 12/23 6:15am Certainty: Possible

Areas Affected: San Bernardino and Riverside County Valleys-The Inland Empire - San Bernardino County Mountains - Riverside County Mountains - Santa Ana Mountains and Foothills - Apple and Lucerne Valleys - Coachella Valley - San Gorgonio Pass Near Banning - Orange County Coastal - Orange County Inland
 
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, Orange County
Coastal Areas, Orange County Inland Areas, Riverside County
Mountains, San Bernardino County Mountains, San Bernardino and
Riverside County Valleys-The Inland Empire, San Gorgonio Pass near
Banning and Santa Ana Mountains and Foothills.

* WHEN...From late Tuesday afternoon through Wednesday evening.

* 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. Mud and
debris flow are possible near and in burn scars, including the
Airport, Bridge and Line burn scars.

* ADDITIONAL DETAILS...
- An Atmospheric River will bring widespread moderate to heavy
rain to the region late Tuesday through Wednesday. Showers
could begin to develop as early as Tuesday evening,
especially in the eastern San Gabriel Mountains. Heaviest and
most widespread rain is expected Wednesday morning for the
northwest portion of the forecast area and then spreading
southeast through the day. Peak rainfall rates of 0.50 to 1
inch per hour are expected. There is a potential for locally
heavier hourly rainfall rates to develop with convection
embedded in the main rain band or in thunderstorms after the
main band passes. Scattered locally heavy showers could
continue into Thursday but impacts from any additional rain
are expected to be more localized.

Snow levels are expected to remain above 8000 ft during
period of heaviest precipitation bringing a heightened risk
of mud slides, debris flow, and areas of flash flooding in
the San Bernardino county mountains.
- 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.