####018007243#### ACUS45 KWBC 110321 SCCNS5 Storm Summary Number 1 for Major Pacific Coast to High Plains Storm System NWS Weather Prediction Center College Park MD 700 PM PST Sat Dec 10 2022 ...Heavy precipitation and strong winds continue across the Pacific Coast, as strong storm system moves ashore... Winter Storm Warnings are in effect for northwest Washington, west-central Oregon, the Sierra Nevada and Transverse Mountain Ranges, the Sawtooth Range of Idaho, central Nevada, and southwestern Utah. High Wind Warnings are in effect for portions of southern California. Winter Storm Watches are in effect for southwestern Montana, North Dakota, the western half of South Dakota, extreme northwestern Minnesota, eastern Wyoming, central Utah, and northern Nebraska. Winter Weather Advisories are in effect for the Cascade Range of Oregon, northern California, much of northwestern Nevada, central Arizona, southwest Utah, central Idaho, western Wyoming, and central Montana. Wind Advisories are in effect for southern California, central Nevada, and western Utah. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...A potent storm system was moving ashore the Pacific Coast, with the main low being analyzed nearly 300 miles west of Washington state in the Pacific Ocean with a central pressure of 989mb, or 29.21 inches of mercury. An occluded boundary extended southwestward from the low across the Pacific Northwest and northern California before connecting to the triple point located northeast of San Francisco, CA. From the triple point, a cold front stretched southwestward into the Pacific Ocean, while a warm front extended southward along the California coastline. Current surface observations and RADAR indicate that the heaviest axis of precipitation was located across central California and extending inland through the Sierra Nevada range, where heavy snowfall rates as high as 4-5" per hour have been reported across portions of the higher terrain. Generally, below 4000 feet, much of the preciptation has fallen as rain across California, with RADAR depicting additional areas of scattered light to moderate rainfall ongoing across northern portions of the state, with some pockets of higher elevation snow in the Klamath and Cascade Ranges. Elsewhere, precipitation was spreading westward through central Nevada and southern Idaho, with ongoing lower elevation rainfall and mountain snow. Strong winds were also being reported across much of California and western Nevada. ...Selected preliminary Storm Total Snowfall in inches from 700 AM PST Tue Nov 29 through 600 PM PST Fri Dec 02... ...CALIFORNIA... MT. SHASTA SKI PARK 21.0 WEED 2 SSW 18.0 CARRVILLE 14 N 10.0 RUTH 2 WNW 1.0 ...OREGON... MT. ASHLAND SKI ROAD 8.0 BEND 6.0 LA PINE 5 NNW 5.0 E DIAMOND LAKE SUMMIT 4.0 ...WASHINGTON... TROUT LAKE 1 SSW 17.5 LEAVENWORTH 1 NNW 17.0 MALOTT 7 WNW 17.0 WAUCONDA 12 S 9.0 FIVE MILE 7 NW 8.8 YAKIMA 2 ENE 5.0 ...Selected preliminary Storm Total Rainfall in inches from 700 AM PST Tue Nov 29 through 600 PM PST Fri Dec 02... ...CALIFORNIA... BUCKS LAKE 1 NW 4.44 CITRUS HEIGHTS 3.73 WOODLAND 3.62 ARNOLD 3.48 STRAWBERRY VALLEY 3.48 DOWNIEVILLE 3.33 PARADISE 1.1 W 2.48 DE SABLA 2.36 VOLCANO 2.16 LEGGETT 2.00 NOVATO 5 NNW 1.14 ...OREGON... GOLD BEACH 3.00 SELMA 2.33 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... HEAVENLY SKI SUMMIT 1 NNW 103 MAMMOTH MOUNTAIN SKI 98 WALKER 4 SSW 93 ANTELOPE LAKE 5 NNW 92 FT DICK 5 SE 60 KNEELAND 2 ESE 57 HIGHLANDS 1 SW 40 ...NEVADA... WASHOE CITY 4 NNW 76 STEAD 2 WSW 73 SPARKS 3 SSW 66 GARDENVILLE RANCH 3 WSW 65 ...OREGON... PILOT ROCK 9 S 80 TALENT 2 NE 50 Heavy precipitation is expected to continue to fall across California and the Great Basin region over the next 24-36 hours as the potent storm system continues to move ashore. The highest elevations of the Sierra Nevada Range could see snowfall totals of 3-4 feet, with locally greater amounts possible, through Monday morning, with lesser amounts expected for lower elevations (above 3000ft). For rainfall-related impacts, there is a Slight Risk of Excessive Rainfall for the central California coast tonight and for southern California around the greater Los Angeles and San Diego metropolitan areas on Sunday. Rainfall totals of 2-4 inches, locally higher, as well as the potential for heavier rainfall rates over 0.5 inches per hour may lead to some scattered instances of flooding. As the system tracks eastward, precipitation will overspread much of the Great Basin, central Rockies, and portions of the Southwest on Sunday, with higher elevations forecast to see 6-12" of snow through Monday. The system will then eject out into the central Plains on Tuesday, where a developing low-pressure will track eastward, leading to heavy snow and possible blizzard conditions across portions of the central and northern High Plains through Wednesday. The next Storm Summary will be issued by the Weather Prediction Center at 700 AM PST. Please refer to your local National Weather Service office for additional information on this event. Russell $$