Spring Valley Lake Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Spring Valley Lake.

Use the Radar Maps link provided to understand the trajectory of a storm.

Dense Fog Advisory issued December 8 at 2:45AM PST until December 8 at 12:00PM PST by NWS Sacramento CA

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carquinez Strait and Delta, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...Until noon PST today. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Dense fog with visibilities less than one quarter mile have been observed, especially in low-lying areas.

Dense Fog Advisory issued December 8 at 1:43AM PST until December 8 at 9:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...San Luis Obispo County Beaches, San Luis Obispo County Inland Central Coast, Santa Barbara County Central Coast Beaches, and Santa Barbara County Inland Central Coast. * WHEN...Until 9 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.

High Wind Watch issued December 8 at 1:43AM PST until December 10 at 1:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...Northeast winds 20 to 30 mph with gusts up to 50 mph possible. * WHERE...Central Ventura County Valleys, Eastern Santa Monica Mountains Recreational Area, Ventura County Beaches, Ventura County Inland Coast, and Western San Fernando Valley. * WHEN...From Monday evening through Tuesday afternoon. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles.

High Wind Watch issued December 8 at 1:43AM PST until December 11 at 12:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...Northeast winds 30 to 40 mph with gusts up to 65 mph possible. * WHERE...Santa Clarita Valley, Santa Susana Mountains, Southeastern Ventura County Valleys, Western San Gabriel Mountains and Highway 14 Corridor, and Western Santa Monica Mountains Recreational Area. * WHEN...From Monday afternoon through Wednesday morning. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles.

Wind Advisory issued December 8 at 12:48AM PST until December 10 at 4:00PM PST by NWS Las Vegas NV

* WHAT...North winds 20 to 30 mph with gusts up to 45 mph expected in the Colorado River Valley. * WHERE...Lake Mead National Recreation Area, Lake Havasu and Fort Mohave, and San Bernardino County-Upper Colorado River Valley. * WHEN...From 10 AM PST /11 AM MST/ Monday to 4 PM PST /5 PM MST/ Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Dense Fog Advisory issued December 7 at 11:56PM PST until December 8 at 1:00PM PST by NWS Medford OR

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of northern California and south central and southwest Oregon, especially valleys and low lying areas. * WHEN...Until 1 PM PST Sunday. * IMPACTS...Low visibility could make driving conditions hazardous.

Dense Fog Advisory issued December 7 at 9:39PM PST until December 8 at 12:00PM PST by NWS Hanford CA

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Across the San Joaquin Valley from Merced to Kern Counties. * WHEN...Until noon PST Sunday. * IMPACTS...Low visibility could make driving conditions hazardous.

Red Flag Warning issued December 7 at 9:35PM PST until December 11 at 4:00AM PST by NWS San Diego CA

...RED FLAG WARNING IN EFFECT FROM 10 AM MONDAY TO 4 AM PST WEDNESDAY FOR STRONG GUSTY SANTA ANA WINDS AND LOW RELATIVE HUMIDITY IN ALL MOUNTAIN AREAS, THE INLAND EMPIRE, AND SAN DIEGO COUNTY VALLEYS... * WINDS...Northeast and east winds 20 to 30 mph. Gusts in the valleys 35 to 45 mph, locally over 60 mph in mountains and passes. Highest winds in east-west oriented passes, such as the San Gorgonio Pass and San Diego County mountains and foothills. * RELATIVE HUMIDITY...As low as 5 to 10 percent. Though winds will be calmer by Wednesday and Thursday, relative humidity will stay in this range each afternoon. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. Outdoor property may be damaged along with difficult driving conditions. * LOCATION...San Bernardino and Riverside County Valleys -The Inland Empire, San Diego County Inland Valleys, San Bernardino County Mountains-Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest, Riverside County Mountains-Including The San Jacinto Ranger District Of The San Bernardino National Forest, Santa Ana Mountains-Including The Trabuco Ranger District of the Cleveland National Forest, San Diego County Mountains- Including The Palomar And Descanso Ranger Districts of the Cleveland National Forest and San Gorgonio Pass Near Banning.

Fire Weather Watch issued December 7 at 2:36PM PST until December 10 at 10:00PM PST by NWS Los Angeles/Oxnard CA

*** INCREASING POTENTIAL FOR HIGH END RED FLAG WARNING EVENT FOR PORTIONS OF LOS ANGELES AND VENTURA COUNTIES *** ...RED FLAG WARNING IN EFFECT FOR LOS ANGELES AND VENTURA COUNTY MOUNTAINS AND VALLEYS 10 AM MONDAY UNTIL 6 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT FOR VENTURA COUNTY COAST AND MALIBU 2 PM MONDAY UNTIL 2 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...FIRE WEATHER WATCH IN EFFECT FOR SAN LUIS OBISPO COUNTY MOUNTAINS 10 PM MONDAY UNTIL 10 PM TUESDAY DUE TO GUSTY SOUTHEAST TO EAST WINDS AND VERY LOW HUMIDITIES... .As surface high pressure builds into the Great Basin, Santa Ana winds are expected to increase late Monday morning into afternoon, then peak Monday night into Tuesday. Offshore winds are expected to diminish some by Wednesday, but very dir will persist. With the strong likelihood of widespread single digit humidities with this event, confidence is increasing for a long duration Red Flag event. In addition, there is the potential for a high end Red Flag event across some of the windiest areas Monday night through Tuesday, as localized wind gusts of 55 to 70 mph could overlap with single digit humidities across the western San Gabriels, Santa Susanas, western Santa Monicas, Ventura county valleys, and the hills above Camarillo. The National Weather Service in Los Angeles/Oxnard has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Monday evening through Tuesday evening. * WINDS...Southeast to east 15 to 30 mph with gusts to 40 mph. * RELATIVE HUMIDITY...Widespread single digit humidities developing by later Monday night or Tuesday. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Red Flag Warning issued December 7 at 2:36PM PST until December 11 at 2:00PM PST by NWS Los Angeles/Oxnard CA

*** INCREASING POTENTIAL FOR HIGH END RED FLAG WARNING EVENT FOR PORTIONS OF LOS ANGELES AND VENTURA COUNTIES *** ...RED FLAG WARNING IN EFFECT FOR LOS ANGELES AND VENTURA COUNTY MOUNTAINS AND VALLEYS 10 AM MONDAY UNTIL 6 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT FOR VENTURA COUNTY COAST AND MALIBU 2 PM MONDAY UNTIL 2 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...FIRE WEATHER WATCH IN EFFECT FOR SAN LUIS OBISPO COUNTY MOUNTAINS 10 PM MONDAY UNTIL 10 PM TUESDAY DUE TO GUSTY SOUTHEAST TO EAST WINDS AND VERY LOW HUMIDITIES... .As surface high pressure builds into the Great Basin, Santa Ana winds are expected to increase late Monday morning into afternoon, then peak Monday night into Tuesday. Offshore winds are expected to diminish some by Wednesday, but very dir will persist. With the strong likelihood of widespread single digit humidities with this event, confidence is increasing for a long duration Red Flag event. In addition, there is the potential for a high end Red Flag event across some of the windiest areas Monday night through Tuesday, as localized wind gusts of 55 to 70 mph could overlap with single digit humidities across the western San Gabriels, Santa Susanas, western Santa Monicas, Ventura county valleys, and the hills above Camarillo. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for GUSTY Santa Ana winds and very low relative humidity, which is in effect from 2 PM Monday to 2 PM PST Wednesday. The Fire Weather Watch is no longer in effect. * WINDS...Santa Ana winds expected to increase sharply by mid to late Monday afternoon, then peak Monday night through Tuesday, when speeds of 20 to 35 mph with gusts of 35 to 50 mph will likely be common. Isolated gusts around 60 mph will be possible in the hills above Camarillo and Somis. * RELATIVE HUMIDITY...Humidities are expected to lower to around 15 percent in many areas by Monday afternoon, with widespread humidities of 5 to 10 percent likely from Monday night or Tuesday, and persisting into Wednesday, with isolated readings as low as 2 percent likely. * IMPACTS...If fire ignition occurs, conditions are favorable for very rapid fire spread, extreme fire behavior, and long range spotting, which would threaten life and property.

Red Flag Warning issued December 7 at 2:36PM PST until December 11 at 6:00PM PST by NWS Los Angeles/Oxnard CA

*** INCREASING POTENTIAL FOR HIGH END RED FLAG WARNING EVENT FOR PORTIONS OF LOS ANGELES AND VENTURA COUNTIES *** ...RED FLAG WARNING IN EFFECT FOR LOS ANGELES AND VENTURA COUNTY MOUNTAINS AND VALLEYS 10 AM MONDAY UNTIL 6 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT FOR VENTURA COUNTY COAST AND MALIBU 2 PM MONDAY UNTIL 2 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...FIRE WEATHER WATCH IN EFFECT FOR SAN LUIS OBISPO COUNTY MOUNTAINS 10 PM MONDAY UNTIL 10 PM TUESDAY DUE TO GUSTY SOUTHEAST TO EAST WINDS AND VERY LOW HUMIDITIES... .As surface high pressure builds into the Great Basin, Santa Ana winds are expected to increase late Monday morning into afternoon, then peak Monday night into Tuesday. Offshore winds are expected to diminish some by Wednesday, but very dir will persist. With the strong likelihood of widespread single digit humidities with this event, confidence is increasing for a long duration Red Flag event. In addition, there is the potential for a high end Red Flag event across some of the windiest areas Monday night through Tuesday, as localized wind gusts of 55 to 70 mph could overlap with single digit humidities across the western San Gabriels, Santa Susanas, western Santa Monicas, Ventura county valleys, and the hills above Camarillo. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty Santa Ana winds and very low relative humidity, which is in effect from 10 AM Monday to 6 PM PST Wednesday. The Fire Weather Watch is no longer in effect. * WINDS...Santa Ana winds expected to increase sharply late Monday morning or afternoon, then peak Monday night into Tuesday, when speeds of 20 to 30 mph with gusts of 35 to 50 mph will likely be common. Offshore winds are expected to diminish some on Wednesday, with gusts mostly in the 20 to 40 mph range. * RELATIVE HUMIDITY...Humidities are expected to lower to around 15 percent in many areas by Monday afternoon, with widespread humidities of 5 to 10 percent likely from Monday night or Tuesday, and persisting into Wednesday, with isolated readings as low as 2 percent likely. * IMPACTS...If fire ignition occurs, conditions are favorable for very rapid fire spread, extreme fire behavior, and long range spotting, which would threaten life and property. There is also the risk of locally damaging winds including trees and power lines.

Red Flag Warning issued December 7 at 2:36PM PST until December 11 at 6:00PM PST by NWS Los Angeles/Oxnard CA

*** INCREASING POTENTIAL FOR HIGH END RED FLAG WARNING EVENT FOR PORTIONS OF LOS ANGELES AND VENTURA COUNTIES *** ...RED FLAG WARNING IN EFFECT FOR LOS ANGELES AND VENTURA COUNTY MOUNTAINS AND VALLEYS 10 AM MONDAY UNTIL 6 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...RED FLAG WARNING IN EFFECT FOR VENTURA COUNTY COAST AND MALIBU 2 PM MONDAY UNTIL 2 PM WEDNESDAY DUE TO MODERATE TO STRONG SANTA ANA WINDS AND VERY LOW HUMIDITIES... ...FIRE WEATHER WATCH IN EFFECT FOR SAN LUIS OBISPO COUNTY MOUNTAINS 10 PM MONDAY UNTIL 10 PM TUESDAY DUE TO GUSTY SOUTHEAST TO EAST WINDS AND VERY LOW HUMIDITIES... .As surface high pressure builds into the Great Basin, Santa Ana winds are expected to increase late Monday morning into afternoon, then peak Monday night into Tuesday. Offshore winds are expected to diminish some by Wednesday, but very dir will persist. With the strong likelihood of widespread single digit humidities with this event, confidence is increasing for a long duration Red Flag event. In addition, there is the potential for a high end Red Flag event across some of the windiest areas Monday night through Tuesday, as localized wind gusts of 55 to 70 mph could overlap with single digit humidities across the western San Gabriels, Santa Susanas, western Santa Monicas, Ventura county valleys, and the hills above Camarillo. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Monday to 6 PM PST Wednesday. The Fire Weather Watch is no longer in effect. * WINDS...Santa Ana winds expected to increase sharply late Monday morning into afternoon, then peak Monday night into Tuesday. when speeds of 25 to 40 mph with gusts of 35 to 55 mph will likely be common. Isolated gusts as high as 55 to 70 mph will be likely during the peak of the event in the windiest locations, such as the western San Gabriels, Santa Susanas, western Santa Monicas, Ventura county valleys, and hills above Camarillo. Offshore winds are expected to diminish some on Wednesday, with gusts mostly in the 20 to 40 mph range. * RELATIVE HUMIDITY...Humidities are expected to lower to around 15 percent in many areas by Monday afternoon, with widespread humidities of 5 to 10 percent likely from Monday night or Tuesday, and persisting into Wednesday, with isolated readings as low as 2 percent likely. * IMPACTS...If fire ignition occurs, conditions are favorable for very rapid fire spread, extreme fire behavior, and long range spotting, which would threaten life and property. There is also the risk of locally damaging winds including trees and power lines.

Air Quality Alert issued December 7 at 9:18AM MST by NWS Phoenix AZ

The Imperial County Air Pollution Control District has declared a mandatory wood burning curtailment for residents within the Calexico area for Sunday, December 8, 2024. The declaration of a Mandatory curtailment, when forecast indicate elevated levels of fine particulate air pollution in the region, is issued to protect the public health. Smoke from wood burning can cause health problems. Breathing high levels of pollution from wood smoke can cause breathing problems (including asthma attacks), worsened lung and heart disease symptoms, and may even increase emergency room visits and hospitalizations. The Mandatory Curtailment rule prohibits the operation of any wood burning appliances during the curtailment period. This prohibition does not apply to cookstoves and those devices exclusively gaseous- fueled. To view current and forecast air quality within Imperial County visit the Imperial County Air Quality website at http://www.imperialvalleyair.org/ or follow ICAPCD on Twitter, facebook or Instagram (@county_air)