Porter Ranch 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 Porter Ranch.

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

Heat Advisory issued October 4 at 4:33AM PDT until October 5 at 11:00PM PDT by NWS Sacramento CA

* WHAT...Hot temperatures 92 to 104 expected with warm overnight lows in the 60s to mid 70s. * WHERE...Carquinez Strait and Delta, Motherlode, Northern San Joaquin Valley, and Southern Sacramento Valley. * WHEN...Until 11 PM PDT Saturday. * IMPACTS...Heat related illnesses will be possible, especially for groups that are sensitive to heat. * ADDITIONAL DETAILS...Widespread Moderate HeatRisk is expected across the Valley and Delta, with Major HeatRisk in the foothills and Delta. Limited overnight cooling expected in the foothills. This level of heat may impact outdoor activities.

Red Flag Warning issued October 4 at 4:27AM PDT until October 4 at 8:00PM PDT by NWS Medford OR

* IMPACTS...Strong winds combined with critically low relative humidity could lead to the rapid growth and spread of new and existing fires. * AFFECTED AREA...In California...Fire weather zone 285 including Alturas, and Canby. In Oregon... Fire weather zones 624 and 625. This includes eastern portions of the Fremont Winema National Forest, and the cities of Klamath Falls, Lakeview, Paisley and Summer Lake. * WIND...West to southwest at 15 to 30 mph with gusts up to 50 mph. * HUMIDITY...Minimum afternoon values of 10 to 20 percent but some localized areas as low as 8 percent. * ADDITIONAL DETAILS...Wind gusts will most likely be around 45 mph with only a few areas reaching the 50 mph mark. * DETAILED URL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

Red Flag Warning issued October 4 at 4:08AM PDT until October 4 at 8:00PM PDT by NWS Eureka CA

...Very low humidity along with gusty westerly winds will result in critical fire weather conditions this afternoon... The National Weather Service in Eureka has issued a Red Flag Warning, which is in effect from 11 AM this morning to 8 PM PDT this evening. * AFFECTED AREA...Fire weather zone 264. * WIND...West winds of 15 to 20 mph with gusts up to 30 mph. * HUMIDITY...10 to 20 percent. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

Heat Advisory issued October 4 at 3:37AM PDT until October 4 at 11:00PM PDT by NWS Hanford CA

* WHAT...Hot conditions expected with temperatures reaching up to 105 degrees during the period. Moderate heat risk expected. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during high heat events.

Lake Wind Advisory issued October 4 at 3:29AM PDT until October 4 at 8:00PM PDT by NWS Reno NV

* WHAT...Southwest winds 10 to 20 mph with gusts up to 40 mph and waves 1 to 3 feet for Lake Tahoe. * WHERE...Greater Lake Tahoe Area. * WHEN...From 11 AM this morning to 8 PM PDT this evening. * IMPACTS...Small boats, kayaks, and paddle boards will be prone to capsizing and should remain off lake waters until conditions improve.

Heat Advisory issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the upper 80s to upper 90s expected. * WHERE...San Diego County Mountains. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of 106 to 112 expected. Low temperatures in the mid 70s to upper 80s. * WHERE...Coachella Valley and San Diego County Deserts. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of 106 to 112 expected. Low temperatures in the northern Coachella Valley mostly in the 80s. * WHERE...San Gorgonio Pass Near Banning. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures for the inland valleys in the mid 90s to 103. Low temperatures in the upper 60s to mid 70s for the far inland valleys near the foothills of the mountains. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures in the upper 90s to 105 expected. Low temperatures in the upper 60s to upper 70s near the foothills. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the upper 80s to upper 90s below 5000 feet expected. Low temperatures in the mid 60s to mid 70s below 5000 feet. * WHERE...Riverside County Mountains and San Bernardino County Mountains. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued October 4 at 3:06AM PDT until October 7 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures in the 90s expected. Low temperatures in the upper 60s to upper 70s. * WHERE...Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued October 4 at 2:45AM PDT until October 7 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with high temperatures of 98 to 108 degrees expected. Highest temperatures will be in the valleys, lower foothills and Santa Monica Mountains. Overnight lows will be in the 60s and 70s, except lower 80s in some foothill locations. * WHERE...Most mountains and valley areas. * WHEN...From 10 AM Saturday to 8 PM PDT Monday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors. * ADDITIONAL DETAILS...It will be very dangerous to perform strenuous activities during the late morning through early evening hours over the weekend. Use extreme caution when hiking or biking, even in the popular Santa Monica Mountains, as some of the hottest conditions will be in that location. Heat Advisories may be needed for interior portions of the coastal plain, including Downtown Los Angeles.

Red Flag Warning issued October 4 at 2:44AM PDT until October 4 at 8:00PM PDT by NWS Reno NV

* CHANGES...None * Affected Area...Fire Weather Zone 270 Surprise Valley California, Fire Weather Zone 278 Eastern Lassen County, Fire Weather Zone 423 West Humboldt Basin in Pershing County and Fire Weather Zone 458 Northern Washoe County. * Winds...Southwest 20 to 25 mph with gusts to 30 to 40 mph. Localized gusts to 45 mph possible near the Oregon border. * Humidity...12 to 18%. * Duration...3 to 8 hours. * Impacts...The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity before first responders can contain them.

Excessive Heat Warning issued October 4 at 2:12AM PDT until October 6 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions for early October. High temperatures around 105 degrees. * WHERE...Cadiz Basin and Morongo Basin. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, especially at the end of record-breaking summer heat.

Excessive Heat Warning issued October 4 at 2:12AM PDT until October 6 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions for early October with record to near record high temperatures of 107 to 110 degrees. * WHERE...Lake Mead National Recreation Area, Lake Havasu and Fort Mohave, and San Bernardino County-Upper Colorado River Valley. * WHEN...Until 8 PM PDT /8 PM MST/ Sunday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events, especially at the end of record-breaking summer heat.

Excessive Heat Warning issued October 4 at 2:12AM PDT until October 6 at 8:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions for early October. Temperatures in the lower elevations of Death Valley National Park will top out around 110 to 113 degrees each afternoon. * WHERE...Death Valley National Park. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events, especially at the end of record-breaking summer heat.

Excessive Heat Warning issued October 3 at 10:44PM PDT until October 5 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...San Francisco Bay Shoreline, East Bay Interior Valley, Santa Cruz Mountains, Santa Clara Valley, Santa Lucia Mountains and Los Padres National Forest, Mountains of San Benito and Interior Monterey County. * WHEN...Until 11 PM PDT Saturday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Major HeatRisk (level 3 of 4) in the valleys. Extreme HeatRisk (level 4 of 4) in the mountains.

Excessive Heat Warning issued October 3 at 10:44PM PDT until October 5 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Dangerously hot conditions with temperatures up to 102 and overnight lows in the 70s to lower 80s. * WHERE...Marin Coastal Range, Sonoma Coastal Range and North Bay Interior Mountains. * WHEN...Until 11 PM PDT Saturday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Heat impacts will persist into the weekend.

Excessive Heat Warning issued October 3 at 10:44PM PDT until October 5 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...San Francisco Bay Shoreline, East Bay Interior Valley, Santa Cruz Mountains, Santa Clara Valley, Santa Lucia Mountains and Los Padres National Forest, Mountains of San Benito and Interior Monterey County. * WHEN...Until 11 PM PDT Saturday. * IMPACTS...Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Heat impacts will persist through the weekend.

Heat Advisory issued October 3 at 10:44PM PDT until October 5 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Temperatures up to 95. * WHERE...North Bay Interior Valleys, San Francisco Peninsula Coast, Northern Monterey Bay and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 11 PM PDT Saturday. * IMPACTS...Hot temperatures may cause heat illnesses to occur.

Excessive Heat Warning issued October 3 at 12:52PM MST until October 7 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 104 to 111. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Portions of south central and southwest Arizona and southeast California. * WHEN...Until 8 PM MST /8 PM PDT/ Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued October 3 at 12:52PM MST until October 7 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to 114. Extreme Heat Risk. Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. * WHERE...Southwest corner of Imperial County, Western Imperial County, and Imperial Valley. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.