Hydrometeorological Discussion National Weather Service / California Nevada RFC / Sacramento CA 830 AM PDT Sun Apr 12 2026 ...UNSETTLED WEATHER THROUGH MONDAY AS THE SLOW MOVING UPPER LOW SHIFTS INLAND... .METEOROLOGICAL CONDITIONS (SUN AM - SAT AM)... The upper low has begun to slowly move onshore as a surface low spins along the Humboldt County coast. This is spreading scattered shower activity across much of the forecast area. The upper low will continue to slowly move inland throughout the day today and into Monday. The heaviest precipitation of 1-2 inches during the next 24 hours will focus over the higher elevations of the Shasta Drainage, Sierra Nevada, and eastern Transverse. Thunderstorm activity may lead to locally higher amounts across the North as the meso low makes its way inland. Shower activity is likely to continue through Monday and into Tuesday morning as the upper low departs the region and before a brief period of ridging and dry conditions return to the region. Models continue to show a broader trough moving across the Pacific Northwest and digging south enough to spread precipitation across the north on Thursday next week. Accumulations are currently relatively light, though forecast are likely to change as models continue to to converge on the overall characteristics of this trough. Freezing levels have dropped quite a bit over the past several hours and begin the forecast period below 5k feet across the north and rise to ~10k feet across the south. Levels are expected to rise again on Tuesday under the brief period of ridging. Please Note: This product may NOT be routinely updated. Please refer to the following product issued by the CNRFC www.cnrfc.noaa.gov/Daily-Briefing for a graphical summary of weather and hydrologic conditions. |