####018006939#### ACUS43 KWBC 070214 SCCNS3 Storm Summary Number 4 for West Coast Multi-Hazard Atmospheric River Events NWS Weather Prediction Center College Park MD 700 PM PST Fri Jan 06 2023 ...Heavy rain/snow and high winds moving onshore as the next Atmospheric River arrives... Winter Storm Warnings are in effect for portions of the Sierra Nevada and Klamath Mountain Ranges. Flood Watches are in effect for much of northern Central Valley and southern San Joaquin Valley. High Wind Watches are in effect for southern Oregon. Winter Weather Advisories are in effect for portions of the Cascades. Wind Advisories are in effect for much of central and northern California. For a detailed graphical depiction of the latest watches, warnings and advisories, please see www.weather.gov At 600 PM PST...The next system slated to bring heavy rain/snow and high winds to much of California and the Pacific Northwest was analyzed with a minimum pressure of 976 mb (28.82 in Hg), and located about 500 miles west of Portland, OR. Latest surface observations and RADAR indicated precipitation had moved onshore across the Washington and northern Oregon coastline, with light to moderate rain falling. Further south, conditions remained relatively dry across much of central and southern California with light to moderate precipitation falling over northern California. Snow and mixed precipitation remained confined to the higher elevations of the Olympic, Cascade, and Klamath mountain ranges. ...Selected preliminary Storm Total Snowfall in inches from 700 AM PST Wed Jan 04 through 600 PM PST Fri Jan 06... ...CALIFORNIA... KIRKWOOD MEADOWS 1 SSE 33.0 PINECREST 2 E 32.0 TWIN BRIDGES 2 ESE 26.0 DONNER PEAK 1 W 22.0 SOUTH LAKE 1 NNE 22.0 JUNE MOUNTAIN SKI BASE 18.0 LONE PINE 11 SW 17.0 MAMMOTH MOUNTAIN SKI BASE 16.0 HEAVENLY SKI BASE 12.0 HETCH HETCHY 10 NE 12.0 ...COLORADO... DOUGLAS PASS 8.0 HAYDEN 6.0 DINOSAUR 4.6 ...NEVADA... MT CHARLESTON 12.0 MT ROSE SKI BASE 12.0 ...UTAH... BRIGHTON 17.0 ALTA 10.0 SPRINGDELL 10.0 SUMMIT PARK 8.0 SUNNYSIDE 6.0 ...Selected preliminary Storm Total Rainfall in inches from 700 AM PST Wed Jan 04 through 600 PM PST Fri Jan 06... ...CALIFORNIA... OLD MAN MOUNTAIN 6.57 FRENCH GULCH 5.60 THREE PEAKS 5.59 LOS GATOS 4.17 MORAGA 2.4 NNW 3.82 BURLINGAME 2.0 WSW 3.71 UKIAH MUNICIPAL APT 3.21 THOUSAND OAKS 2.1 WSW 2.91 K6BPM SANTA BARBARA 2.39 ATASCADERO 2.3 NE 2.31 ROHNERT PARK 0.9 SW 2.30 SACRAMENTO INTL APT 2.16 SAN FRANCISCO INTL APT 1.97 LOS ANGELES INTL APT 1.60 HOPLAND 8 SSE 1.50 OXNARD NWS 1.44 SANTA BARBARA MUNICIPAL APT 1.20 REDDING MUNICIPAL APT 1.17 ...Selected preliminary Peak Wind gusts in miles per hour earlier in the event... ...CALIFORNIA... KIRKWOOD MEADOWS 1.2 S 119 GRAPEVINE 3 SSE 104 PULGA 2 NNW 102 PABLO POINT 101 YORKVILLE 5.5 NW 95 CAPETOWN 6 ENE 94 COBB RIDGE WEST 91 ROAD TO RANCHES 90 HIGH GLADE LOOKOUT 89 FERNDALE 6.4 S 88 MAGIC MOUNTAIN TRUCK TRL 87 AMERICAN HOUSE 6 NW 84 AGUA DULCE 8 S 81 BIG BEAR CITY 13 ESE 72 MOUNTAIN GATE 3 NNE 72 CRESCENT CITY 1 ESE 69 JULIAN 9 S 65 BLACK MOUNTAIN 7 E 64 As the next atmospheric river event arrives Friday night into Saturday morning into northern California, conditions are expected to deteriorate with heavy rain/snow and strong winds moving onshore. The focus of the event will then spread further south on Saturday as precipitation moves southward to the central portion of the state. Widespread additional rainfall of 3-5" +, with locally heavier amounts possible, is expected through the weekend. The cumulative effect of an additonal several inches of rainfall after recent heavy precipitation will lead to considerable flood impacts across much of central and northern California, including rapid water rises, rock slides and mudslides. Minor to isolated major river flooding is expected through the weekend into next week, with record river levels possible. Flash flooding and debris flows are possible over burn scar areas. Furthermore, an additional 1-3 feet of snow is also possible during this event across the Klamath and Sierra Nevada Ranges, which will lead to dangerous travel conditions, especially over 5000 feet. 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/Genz $$