####018006455#### ACUS44 KWBC 101504 SCCNS4 Storm Summary Number 3 for Significant California Atmospheric River NWS Weather Prediction Center College Park MD 700 AM PST Tue Jan 10 2023 ...Significant heavy rainfall, mountain snow, and strong winds will continue to impact CA and western NV into tonight... Winter Storm Warnings are in effect over the Sierra Nevada, Klamath Ranges, and portions of the central Rockies. High Wind Warnings extend along much of coastal and southern California Flood Watches extend along much of coastal California, into the Sacramento Valley. Winter Weather Advisories are in effect for northern California, central Nevada, the Wasatch Mountains, and much of the central and northern Rockies. Wind Advisories are in effect across much of California, southern Nevada, and western portions of Utah and Arizona. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 AM PST...Current RADAR and surface observations detected widespread moderate to heavy rainfall over much of California associated with an intense atmospheric river plume surging inland ahead of a cold front situated in the central and northern parts of the state. The heaviest axis of precipitation was located to the southeast of Sacramento in the northern portion of the San Joaquin Valley. Snow was confined to the higher elevations of the central and southern Sierra Nevada Range, with the heaviest snowfall rates limited to higher elevations. Strong wind gusts were also ongoing across much of southern California, especially in the higher elevations of the Transverse and Sierra Nevada Ranges. ...Selected preliminary Storm Total Snowfall in inches from 500 PM PST Sun Jan 08 through 600 AM PST Tue Jan 10... ...CALIFORNIA... LONE PINE 11 SW 47.0 SOUTH LAKE 1 NNE 41.0 ROUND VALLEY 9 WNW 32.0 MAMMOTH MOUNTAIN SKI BASE 18.0 SUSANVILLE 5 WNW 15.0 SODA SPRINGS 2 ENE 14.0 WILLOW CREEK 4 WSW 14.0 BEAR VALLEY 2 N 12.0 DEEP SPRINGS 11 WSW 12.0 ...Selected preliminary Storm Total Rainfall in inches from 500 PM PST Sun Jan 08 through 600 AM PST Tue Jan 10... ...CALIFORNIA... SAN MARCOS PASS 17.11 NORDHOFF RIDGE 17.01 ALISAL RESERVOIR 13.82 ROCKY BUTTE 12.91 THREE PEAKS (SANTA LUCIA) 12.75 DOULTON TUNNEL 11.90 HOPPER CANYON 10.79 NATURE POINT NEAR BASS LAKE 9.60 MONTECITO 8.85 CHALK PEAK 8.58 MINING RIDGE 8.40 DINKEY 7.20 SAN FRANCISCO INTL AIRPORT 1.84 SANTA MONICA 1.56 LOS ANGELES INTL AIRPORT 1.51 SACRAMENTO INTL AIRPORT 1.43 ...NEVADA... GENOA 1.95 KINGS CANYON 1.84 GLENBROOK 1.26 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... COPPER CANYON 98 WASHOE CITY 2 NNE 98 AGUA DULCE 8 S 88 WEITCHPEC 11 WSW 86 HIGH GLADE LOOKOUT 80 JOAQUIN RANGE 78 KNEELAND 6 SSE 77 SILVERWOOD LAKE 76 SANDSTONE PEAK 71 CAYUCOS 7 N 69 CRESCENT CITY 3 NW 68 ...OREGON... YACHATS 2 SE 86 GARIBALDI 2 WNW 83 PILOT ROCK 9 S 75 ...WASHINGTON... FRANCES 6 ESE 68 RYDERWOOD 2 SW 58 TOKELAND 1 ESE 57 The barrage of heavy rainfall, mountain snow, and strong winds will persist today across central and southern California as the Atmospheric River slowly shifts southward. Areas in southern California will experience the most substantial precipitation impacts, as a swath of heavy precipitation crosses the state today. Areas further north will experience lingering impacts through today as onshore flow to the south of the low will continue to bring moisture into the region. The cumulative effect of successive heavy rain events will lead to additional considerable flood impacts, including rapid water rises and mudslides across California and portions of far western Nevada. Numerous instances of flash flooding and debris flows are possible, especially over burn scar areas. Scattered power outages are also likely due to the strong wind gusts. Atop the Sierra Nevada peaks, additional snowfall totals of 1-4 feet will lead to dangerous travel above 4000 feet today and into tonight. Mountain communities will be at increasing risk of infrastructure impacts and avalanches as snow load continues to rapidly increase. The next Storm Summary will be issued by the Weather Prediction Center at 700 PM PST. Please refer to your local National Weather Service office for additional information on this event. Russell/Genz $$