NOAA has upped the snowfall total for the storm coming to California Thursday and Friday and issued a Winter Weather Advisory at 3:05pm PST today that is calling for 3-6″ of snow.
Total snow accumulations up to 3 to 6 inches are expected above 6500 feet. - NOAA Reno, NV today
They’re now saying up to 6″ of snow may fall in the higher elevations near in Tahoe and that there may be a 1-3 hour period of 1+ inch/hour snowfall rates.
...a 1-3 hour period of snow is a reasonable expectation with potential snowfall rates 1+ inch/hour. - NOAA Reno, NV today
... while a few sites above 7500 feet around Tahoe could receive up to 6 inches. - NOAA Reno, NV today
Snow levels will start at 9,000′ on Thursday before dropping as low as 5,000′ overnight on Thursday.
Snow levels will begin quite high (above 9000 feet) at onset, then drop rapidly overnight to 5000-5500 feet for northeast CA and near 6000 feet around the Tahoe basin. - NOAA Reno, NV today
Winds up to 100mph are forecast on ridges in the Sierra Nevada on Thursday/Friday.
Winds...All wind-related headlines will remain intact with peak gust potential still up to 50 mph (65 mph in wind prone areas) in the advisory areas, with Sierra ridge gusts near 100 mph. - NOAA Reno, NV today
Winter Weather Advisory for California:
URGENT - WINTER WEATHER MESSAGE National Weather Service Sacramento CA 305 PM PDT Wed Oct 18 2017 ...Early Season Snow and Gusty Winds... .A cool weather system will bring early season snow to the Northern Sierra late Thursday night through Friday morning. Snow levels are expected to begin high Thursday then drop rapidly to around 5500 feet Friday morning. There could be 3 to 6 inches of snow along Interstate 80 above 6500 feet...impacting areas near Donner pass. Motorists traveling over mountain passes should be prepared for slick roads. Winds gusting to 65 mph over mountain ridges could cause problems for high profile vehicles and when combined with snow could bring poor visibility. CAZ068-069-191200- /O.NEW.KSTO.WW.Y.0018.171020T0600Z-171020T1800Z/ Western Plumas County/Lassen Park- West Slope Northern Sierra Nevada- 305 PM PDT Wed Oct 18 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THURSDAY TO 11 AM PDT FRIDAY ABOVE 6500 FEET... * WHAT...Snow expected. Plan on slippery road conditions. Strong, gusty winds may impact driving and visibility. Total snow accumulations up to 3 to 6 inches are expected above 6500 feet. * WHERE...Western Plumas County/Lassen Park and West Slope Northern Sierra Nevada County. * WHEN...11 PM Thursday to 11 AM Friday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times.
NOAA Forecast Discussion Excerpt:
Snow Levels/amounts...Snow levels will begin quite high (above 9000 feet) at onset, then drop rapidly overnight to 5000-5500 feet for northeast CA and near 6000 feet around the Tahoe basin. There is some uncertainty as to how much of the heavier precip rates will occur in the cold sector, but a 1-3 hour period of snow is a reasonable expectation with potential snowfall rates 1+ inch/hour. This could yield a couple of inches of snowfall west of Susanville in northeast CA (near and above 5500 feet) and also for Mono County near the crest including the higher passes (Sonora and Tioga), while a few sites above 7500 feet around Tahoe could receive up to 6 inches. Currently we are not planning any winter weather headlines but there could be some slick or slushy roads across most Sierra passes above 7000-7500 feet, and also on the higher elevation routes west of Susanville such as Highways 36 and 44. - NOAA Reno, NV today