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California Highway SR-9 North Traffic

Updated Jan 23, 2021  

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  • NWS Alerts

  • Hydrologic Outlook

    Hydrologic Outlook issued January 23 at 5:21AM PST by NWS San Francisco CA

    North Bay Interior Valleys; Santa Lucia Mountains and Los Padres National Forest; Northern Salinas Valley/Hollister Valley and Carmel Valley; East Bay Interior Valleys; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Coastal North Bay Including Point Reyes National Seashore; Santa Cruz Mountains; San Francisco; Northern Monterey Bay; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; North Bay Mountains; East Bay Hills and the Diablo Range; San Francisco Peninsula Coast; Santa Clara Valley Including San Jose; San Francisco Bay Shoreline; Southern Monterey Bay and Big Sur Coast

    * WHAT... A series of Pacific storms is expected to bring periods of moderate to heavy rain to the region through the coming week. The next system on Sunday afternoon and evening will be on the cooler, weaker side and will bring generally beneficial light to moderate rainfall. A much stronger and wetter system due to arrive by late Tuesday will likely produce periods of heavy rain from Tuesday evening through at least Wednesday evening, and possibly through late Thursday. This system will result in an increased risk of mudslides and debris flow over wildfire burn areas, as well as localized ponding of water in low-lying or poorly drained areas. 2 to 4 inches of precipitation is forecast for most urban and lower elevation areas from late Tuesday through Thursday, while 4 to 7 inches of rain is projected over higher terrain. * WHERE... Entire forecast area from Napa and Sonoma Counties south through Monterey and San Benito Counties. Latest model guidance suggests the coastal slopes of the Santa Cruz Mountains and Santa Lucia Mountains above Big Sur will be the most likely locations of heaviest precipitation. * WHEN... Sunday through Thursday. Periods of potentially intense rain rates are expected starting late Tuesday evening in the North Bay, then spreading south across the remainder of the region Tuesday night and Wednesday. Additional heavy rain may continue into Wednesday night and Thursday, especially across areas from the Santa Cruz Mountains southward. * ADDITIONAL DETAILS... The primary concern is for mud, rock, and debris flows that may occur across recent burn areas. In addition, strong gusty winds are likely at times, especially on Tuesday night and Wednesday. Debris from gusty winds may cause drainage blockages which could create a localized flooding threat, especially in mountainous terrain. Localized ponding of water is likely in low-lying or poorly drained areas, such as freeway offramps. No mainstem river flooding is forecast due to dry conditions so far this winter. Roadways will be extra slick after the recent dry stretch. Details regarding the midweek storm will likely change as we draw closer to the event. Therefore, please monitor the latest forecast for the most up to date weather information. Confidence is high that we will receive widespread rainfall from the midweek system. However, confidence is low to moderate with respect to the timing and location of heaviest precipitation, as well as total rainfall accumulation.

    Weather Boulder Creek


    Tonight Partly Cloudy


    Sunday Rain Showers


    Sunday Night Rain Showers


    Monday Partly Sunny


    Monday Night Partly Cloudy then Patchy Frost

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