RIVERSIDE AND SAN DIEGO COUNTIES – A cold low pressure system will continue to move into the pacific northwest today then into central California and Nevada on Friday, sending a series of disturbances across southern California late tonight through Saturday morning.
This will likely bring much colder conditions with periods of strong and gusty winds in the mountains and deserts as well as rain and snow showers along and west of the mountains and in the upper deserts. Snow levels will lower to around 2500 feet by Friday evening.
Rainfall ranging from one quarter to one half inch will come in the coastal areas and valleys, with one half to near one inch in the mountains and two tenths of an inch or less in the deserts. Local snow levels near 2000 feet will be possible during showers.
Isolated thunderstorms are possible Friday night with small hail or graupel possible. Waterspouts will also be possible over the coastal waters.
Southwest to west winds in the mountains and deserts Thursday night and Friday, with strongest gusts to 50 mph, will be mainly near ridge tops and along and near desert mountain slopes.
This weather could be deadly for unprepared campers or hikers. The combination of gusty winds, low visibilities, and snowfall could create hazardous travel conditions in the mountains, especially Friday and Friday night with snow levels low enough to impact travel on Interstate 15 through the Cajon Pass and Interstate 8 through the San Diego County mountains.
Pacific storm to bring cold weather, snow tomorrow and over the weekend
RIVERSIDE COUNTY – A cold pacific storm will bring significantly colder air to the region as well as lower elevation snow. Snow levels will quickly fall tonight to around 5000 feet before plunging on Friday to near 3000 feet. Locally lower snow levels will be possible in some showers and possible thunderstorms. Gusty west winds may also cause
blowing snow to reduce visibilities to a quarter mile or less at times.
West winds 15 to 35 mph, with local gusts up to 60 mph over the windiest ridges, will be in place.
Snow should be ending late Friday night. Cold conditions will continue for the next several nights with freezing temperatures potentially causing areas of black ice or slippery roads.
A winter storm warning for heavy snow means severe winter weather conditions are expected or occurring. Significant amounts of snow are forecast that will make travel dangerous. Only travel in an emergency. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency.
Cold storm to arrive Thursday bringing rain, snow, wind
RIVERSIDE – A pair of Pacific low pressure systems will merge off the British Columbia coast today before moving southward toward Riverside County, forecasters said.
The merged systems will form a cold Pacific storm that should arrive in the county late Thursday night, bringing rain, snow and wind gusts up to 65 miles per hour through early Saturday, according to the National Weather Service.
”There are still some minor model timing differences but overall it is expected to be much cooler during this period with strong gusty winds in the mountains and deserts, with showers along and west of the mountains and in the upper deserts, and with snow levels lowering to around 2,500 feet,” an NWS advisory said.
Rainfall totals from the storm are expected to be around a half-inch in the mountains, with greater amounts in places.
Also in the mountains, three to six inches of snow is expected above 4,000 feet, with local amounts of six to nine inches mainly above 6,000 feet.
The weather service said a couple of inches of snow is possible in the far inland valleys late Friday night and early Saturday.
Isolated thunderstorms are also possible Friday night, with small hail, according to the NWS.
”This weather could be deadly for unprepared campers or hikers,” according to a weather service advisory. ”The combination of strong winds, low visibilities and snowfall could create hazardous travel conditions in the mountains, especially Friday and Friday night.”