Santa Western Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth and road condition may be unsafe. Additional information is available at https://water.weather.gov/ahps2/ Stay tuned for further updates by listening to NOAA weather radio... or your local radio and TV stations.

Special Weather Statement issued May 4 at 4:02PM PDT by NWS Sacramento CA

At 402 PM PDT, Doppler radar was tracking a strong thunderstorm near Orland, moving east at 20 mph. HAZARD...Winds in excess of 30 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... Chico, Orland, Nord, Durham, Ordbend, Dayton, and Hamilton City.

Flood Advisory issued May 4 at 3:53PM PDT until May 4 at 7:00PM PDT by NWS Hanford CA

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...The city of Merced and surrounding areas. * WHEN...Until 700 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 350 PM PDT, the public reported minor flooding in the advisory area. Minor flooding is ongoing. - Some locations that will experience flooding include... Merced. - http://www.weather.gov/safety/flood

Winter Storm Warning issued May 4 at 3:44PM PDT until May 5 at 8:00AM PDT by NWS Hanford CA

* WHAT...Heavy snow expected above 6000 feet. Total snow accumulations 6 to 12 inches from 6000 feet to 7000 feet. Total snow accumulations 12 to 24 inches above 7000 feet. Wind gusts as high as 75 mph on exposed ridgetops and along the crest. * WHERE...Kings River north to Yosemite NP, excluding the Yosemite Valley. * WHEN...Valid until 8 AM PDT Sunday morning. * IMPACTS...Travel will be extremely difficult. High winds could cause tree damage. Cold wind chill readings as low as 20 below zero may result in hypothermia if precautions are not taken.

Wind Advisory issued May 4 at 3:42PM PDT until May 5 at 11:00PM PDT by NWS Hanford CA

* WHAT...Sustained west winds 25 to 35 mph, with gusts near 55 mph expected. * WHERE...Indian Wells Valley and Mojave Desert. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Blowing dust will reduce visibilities at times. Travel will be difficult, particularly for high profile vehicles. * ADDITIONAL DETAILS...Highways affected include, but are not limited to U.S. Highway 395, Highway 178, and Highway 58.

High Wind Warning issued May 4 at 3:42PM PDT until May 5 at 11:00PM PDT by NWS Hanford CA

* WHAT...Sustained west winds 35 to 45 mph, with gusts near 65 mph expected. * WHERE...Mojave Desert Slopes. * WHEN...Until 11 PM PDT Sunday. * IMPACTS...Damaging winds may blow down tree branches. Blowing dust will reduce visibilities at times. Travel will be difficult, particularly for high profile vehicles. * ADDITIONAL DETAILS...Highways affected include but are not limited to Highway 14, Highway 178 below Walker Pass, and Highway 58 below Tehachapi Pass, including the town of Mojave.

Winter Weather Advisory issued May 4 at 2:32PM PDT until May 5 at 8:00AM PDT by NWS Reno NV

* WHAT...Snow above 5000 feet. Additional snow accumulations up to 2 to 5 inches. * WHERE...Lassen-Eastern Plumas-Eastern Sierra Counties. * WHEN...Until 8 AM PDT Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Travel could be very difficult. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Those traveling over higher Sierra passes and recreating in the Sierra back country should be prepared for late season wintry conditions at times overnight Saturday into early Sunday morning.

Winter Storm Warning issued May 4 at 2:32PM PDT until May 5 at 8:00AM PDT by NWS Reno NV

* WHAT...Heavy snow. Additional snow accumulations of to 2 to 6 inches around lake level, 5 to 10 inches along and west of Hwy 89 and 10 to 18 inches across the Sierra Crest above 7000 feet. Winds gusting as high as 50 mph. Wind prone areas along Hwy 395 in Mono County may see gusts 60+ mph. Higher Sierra ridgetops may see gusts 100+ mph. * WHERE...Greater Lake Tahoe Area, and Mono County. * WHEN...Until 8 AM PDT Sunday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Visibilities may drop below 1/2 mile due to falling snow. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Travel could be very difficult to impossible. Very strong winds could cause extensive damage to trees and power lines. * ADDITIONAL DETAILS...Those traveling over higher Sierra passes and recreating in the Sierra back country should expect late season wintry conditions through early Sunday morning

Wind Advisory issued May 4 at 1:53PM PDT until May 5 at 5:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Antelope Valley, Eastern Antelope Valley Foothills, Eastern San Gabriel Mountains, Western Antelope Valley Foothills, and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...Until 5 AM PDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued May 4 at 1:53PM PDT until May 5 at 9:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Northwest winds 15 to 25 mph with gusts up to 40 mph expected. * WHERE...Catalina and Santa Barbara Islands, Los Angeles County Beaches, Malibu Coast, San Luis Obispo County Beaches, San Luis Obispo County Inland Central Coast, Santa Barbara County Central Coast Beaches, Santa Barbara County Inland Central Coast, Santa Ynez Valley, Ventura County Beaches, and Ventura County Inland Coast. * WHEN...From 10 AM to 9 PM PDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued May 4 at 1:53PM PDT until May 6 at 3:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Northwest winds 15 to 30 mph with gusts up to 45 mph expected. * WHERE...Interstate 5 Corridor, Northern Ventura County Mountains, Santa Barbara County Interior Mountains, Santa Barbara County Southeastern Coast, Santa Barbara County Southwestern Coast, Santa Ynez Mountains Eastern Range, Santa Ynez Mountains Western Range, and Southern Ventura County Mountains. * WHEN...From 11 PM this evening to 3 AM PDT Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winter Storm Warning issued May 4 at 1:37PM PDT until May 5 at 8:00AM PDT by NWS Sacramento CA

* WHAT...Snow, heavy at times this afternoon and evening. Total snow accumulations of 6 to 15 inches mainly above 5000 feet. Up to 18 inches or more of snow accumulation at the highest elevations. 2 to 6 inches of snow down to around 4000 feet. Winds gusting from 30 to 50 mph out of the southwest. * WHERE...Western Plumas County/Lassen Park and West Slope Northern Sierra Nevada, including Interstate 80 over Donner Pass, Highway 50 over Echo Summit, and Highway 88 over Carson Pass. * WHEN...Through 8 AM PDT Sunday. * IMPACTS...Travel could be difficult from snow-covered roads and reduced visibilities. Chain controls are likely this afternoon and evening. * ADDITIONAL DETAILS...Snow levels will be around 4000 to 5000 feet this afternoon, lowering to around 3000 feet early Sunday morning. Snowfall rates of around 1 to 2 inches per hour are possible through to 10 PM Saturday, which will lead to reduced visibilities and snow-covered roads.

Wind Advisory issued May 4 at 12:53PM MST until May 5 at 9:00AM MST by NWS Phoenix AZ

* WHAT...West winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Western portion of Joshua Tree National Park. * WHEN...From 3 PM this afternoon to 9 AM PDT Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne.

Wind Advisory issued May 4 at 12:53PM MST until May 5 at 8:00PM MST by NWS Phoenix AZ

* WHAT...West winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Southeastern Imperial County, Western Imperial County, Salton Sea, Chuckwalla Mountains, and Imperial Valley. * WHEN...From 3 PM this afternoon to 8 PM PDT Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne.

Wind Advisory issued May 4 at 12:53PM MST until May 5 at 11:00PM MST by NWS Phoenix AZ

* WHAT...Southwest winds 30 to 40 mph with gusts up to 60 mph expected. * WHERE...Southwest corner of Imperial County. * WHEN...From 3 PM this afternoon to 11 PM PDT Sunday. * IMPACTS...Difficult driving conditions, especially for larger vehicles traveling along roads with crosswinds. Light, unsecured objects may become airborne.

Wind Advisory issued May 4 at 12:48PM PDT until May 5 at 8:00PM PDT by NWS San Diego CA

* WHAT...Southwest winds 25 to 35 mph with gusts 55 to 65 mph. Isolated gusts to 70 mph on the desert foothills of the mountains tonight. * WHERE...San Bernardino County Mountains and Apple and Lucerne Valleys. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. Reduced visibility in blowing dust in the deserts. * ADDITIONAL DETAILS...The strongest winds are expected tonight along the desert slopes of the mountains and Sunday afternoon for the Apple and Lucerne Valleys.

Wind Advisory issued May 4 at 12:48PM PDT until May 5 at 8:00PM PDT by NWS San Diego CA

* WHAT...West winds 25 to 35 mph with gusts 55 to 65 mph. Isolated gusts to 70 mph near Whitewater. * WHERE...San Gorgonio Pass Near Banning. * WHEN...Until 8 PM PDT Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. Reduced visibility in blowing dust.

Wind Advisory issued May 4 at 12:48PM PDT until May 5 at 8:00PM PDT by NWS San Diego CA

* WHAT...West winds 25 to 35 mph with gusts 50 to 60 mph expected. * WHERE...Riverside County Mountains, San Diego County Mountains and San Diego County Deserts. * WHEN...From 3 PM today to 8 PM PDT Sunday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. Reduced visibility in blowing dust in the deserts.

Freeze Warning issued May 4 at 11:49AM PDT until May 5 at 8:00AM PDT by NWS Medford OR

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Central Siskiyou County, including the Shasta and Scott valleys. * WHEN...From 2 AM to 8 AM PDT Sunday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

High Wind Warning issued May 4 at 11:18AM PDT until May 5 at 5:00AM PDT by NWS Las Vegas NV

* WHAT...South winds 30 to 40 mph with gusts up to 60 mph. * WHERE...White and Inyo Mountains, Eastern Sierra Slopes, Owens Valley, Death Valley National Park, Esmeralda and Central Nye County, and Western Clark and Southern Nye County. * WHEN...Until 5 AM PDT Sunday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...High crosswinds will occur on sections of Highway 395 in the Owens Valley late this afternoon and evening.

Wind Advisory issued May 4 at 11:18AM PDT until May 5 at 5:00PM PDT by NWS Las Vegas NV

* WHAT...Southwest winds 25 to 35 mph with gusts up to 55 mph. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...Until 5 PM PDT /5 PM MST/ Sunday. * IMPACTS...Strong winds could blow down trees and power lines and a few power outages may result. Unsecured items will be blown around. Travel will be difficult, especially for high profile vehicles. Visibility could be reduced due to blowing dust. Hazardous boating conditions expected on area lakes.

Winter Weather Advisory issued May 4 at 10:38AM PDT until May 4 at 5:00PM PDT by NWS Eureka CA

...UNSEASONABLY COLD STORM TO BRING WET SNOW ABOVE 2500 FEET SATURDAY... * WHAT...Snow above 2500 feet. Additional snow accumulations up to one inch. Small Hail may be possible. * WHERE...Trinity County, Humboldt Interior, Del Norte Interior, and Northeastern Mendocino Interior. * WHEN...Until 5 PM PDT this evening. * IMPACTS...Travel delays due to slick roads and reduced visibilities. * ADDITIONAL DETAILS...Hourly snowfall rates around one inch an hour are highly probable (greater than a 70% chance) Saturday. Snow levels are most uncertain and could vary to as low as 2000 feet to as high as 3500 feet. Small Hail may be possible as cooler air approaches.

Air Quality Alert issued May 3 at 3:55PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert due to increased particle pollution from blowing dust. The air quality alert is in effect from Saturday afternoon to Sunday evening. In areas directly impacted by high levels of windblown dust, limit your exposure by remaining indoors with windows and doors closed and avoiding vigorous physical activity. Run your air conditioner or an air purifier. If temperatures allow, avoid using whole house fans or swamp coolers that bring in outside air. Exposure to high particle pollution levels can cause serious health problems, including asthma attacks, heart and lung disease symptoms, and increased risk of respiratory infections. People with heart or lung diseases should follow their doctor's advice for dealing with episodes of unhealthy air quality. Children, older adults, and people with respiratory or heart disease should avoid prolonged exposure and strenuous activities when particle pollution levels are high. To help minimize outdoor particle pollution levels: * Carpool, telecommute, reduce trips, or take public transportation * Slow down if driving on dirt roads * Stabilize loose soils Levels of particle pollution can vary hour by hour and by location depending on wind conditions. To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory.