RIVERSIDE - A cold Pacific storm system will drop more rain and snow on Riverside County before moving out of the region early today, according to the National Weather Service.
A flash flood watch for the Inland Empire and a winter weather advisory for the mountains issued by the agency were each scheduled to expire at 6 a.m.
The storm, which arrived Tuesday, dropped several inches of snow on the mountains overnight.
The Weather Service said the snow level will go from 4,000 feet to 4,500 feet this afternoon, with about 2 inches of new snow likely. Total snow accumulation resulting from the storm will measure between 11 and 19 inches, forecasters said.
Temperatures today were expected to peak in the 50s in the valleys and in the mid-30s to mid-40s in the mountains.
In the 24-hour period ending at 3 a.m., .51 inches of rain fell at Prado Dam, .43 inches in Temecula, .35 inches in Hemet, .59 inches in Beaumont and .71 inches in Protrero Canyon, according to the NWS.
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED AN
* URBAN AND SMALL STREAM FLOOD ADVISORY FOR... SOUTHWESTERN SAN BERNARDINO COUNTY IN SOUTHEAST CALIFORNIA...WESTERN Riverside COUNTY IN SOUTHWEST CALIFORNIA...WESTERN SAN DIEGO COUNTY IN SOUTHWEST CALIFORNIA...
* UNTIL 930 PM PST
* AT 624 PM PST MODERATE...LOCALLY HEAVY RAIN WAS MOVING THROUGH THE AREA. THIS AREA OF RAIN WILL CONTINUE TO MOVE EASTWARD AT ABOUT 15 MPH. HEAVY RAIN ON SATURATED GROUND WILL PRODUCE LOCAL FLOODING IN LOW LYING AREAS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND.
The urban and small stream flood advisory remains In effect until 6 pm PST For Orange...Western Riverside...Southwestern San Bernardino And Western San Diego Counties...
At 420 pm PST heavy rain was moving through Orange County and the northern Inland Empire. This rain will continue to move slowly eastward late this afternoon...into the southern Inland Empire and San Diego County. This heavy rain on saturated ground will produce local flooding in low lying areas.
Excessive runoff from heavy rainfall will cause elevated levels on small creeks and streams...and ponding of water in urban areas...Highways...streets and underpasses as well as other poor drainage areas and low lying spots.
Excessive runoff from heavy rainfall will cause elevated levels on small creeks and streams...and ponding of water on country roads and farmland along the banks of creeks and streams.
Do not drive your vehicle into areas where the water covers the roadway. The water depth may be too great to allow your car to cross safely. Move to higher ground.
The National Weather Service (NWS) has issued an alert for San Diego County Coastal Areas-San Bernardino And Riverside County Valleys-The Inland Empire-San Diego County Valleys-San Bernardino County Mountains-Riverside County Mountains-San Diego County Mountains-Coachella Valley-San Diego County Deserts
According to the NWS, a cold and vigorous storm system will affect southwest California through early Wednesday.
A cold compact low pressure system will track southward just off the California coast today...moving inland across northern Baja tonight. This system is expected to bring increasing light to locally moderate precipitation today with snow levels near 4500 to 5000 feet.
The cold front is expected to move through southwest California late this afternoon through early evening with numerous showers continuing overnight and decreasing Wednesday. Thunderstorms with small hail are also possible tonight through early Wednesday. Snow levels will lower to around 4000 feet early this evening and 3000 to 3500 feet late tonight through early Wednesday.
Snow levels this low could bring snow to the upper deserts and impact travel on interstate 15 through the Cajon Pass and interstate 8 through the San Diego County mountains. Snowfall of 4 to 8 inches is expected above 5000 feet today in the San Bernardino county mountains today...with snowfall tonight through early Wednesday of 4 to 8 inches for all mountains from 4000 to 6000 feet...and 8 to 16 inches above 6000 feet with locally greater amounts.
Rainfall amounts are expected to range from near 1 inch at the coast to 1.5 to 2.5 inches on the coastal mountain slopes with local amounts to 3.5 inches. Amounts in the deserts of one-quarter to one-half inch.
Periods of high intensity precipitation are possible tonight through early Wednesday from thunderstorms and heavier showers which could increase the runoff and flooding potential...especially for northern areas nearly saturated from rainfall from last Friday night and Saturday. A flash flood watch is posted for these areas through tonight. In areas which have seen fires in recent years...debris flows will be a threat during heavy rains.
Increased risk of flash flooding through late Tuesday
The National Weather Service issued a flash flood watch -- meaning conditions may develop that lead to flash flooding -- effective through late tonight.
``A cold, compact low pressure system will track southward just off the California coast today, moving inland across northern Baja tonight. This will bring periods of locally moderate precipitation through tonight with periods of high intensity of rainfall from thunderstorms and heavier showers possible late this afternoon through tonight,\\\'\\\' the agency reported.
The Weather Service also issued a winter storm watch for the mountains, effective from this afternoon through Wednesday afternoon.
There\\\'s a 50 percent chance of measurable precipitation today in the mountains, where the snow level is expected to drop from 5,500 feet to 3,000 feet overnight. Up to 8 inches of snow could accumulate in the mountains, according to the Weather Service.
Temperatures today were expected to peak in the low 50s to low 60s in the valleys and in the 40s in the mountains.
The Weather Service said temperatures will drop tonight to mid-30s in the valleys and low 20s in the mountains.
Winter storm watch issued through Wednesday
The National Weather Service has issued a winter storm watch through Wednesday for Riverside county Mountains, San Diego County Mountains, and San Bernardino County Mountains.
The winter storm watch is in effect for Tuesday afternoon through Wednesday afternoon. A cold low pressure system is forecast to move across southern California during this time period and there is the possibility of heavy snow in the mountains.
In the San Gabriel Mountains...the San Bernardino Mountains...and the San Jacinto Mountains...total snowfall amounts are expected to range from 8 to 20 inches at elevations between 3500 and 6500 feet and over three feet at elevations above 7000 feet.
In the Santa Rosa Mountains...and the mountains in San Diego County...total snowfall amounts are expected range from 4 to 8 inches at elevations between 3500 and 5000 feet and between 8 and 20 inches at elevations above 5000 feet.