It is expected that active weather will resume by mid-week, bringing bouts of precipitation over the following Christmas weekend and into the first week of the new year. It is conceivable that travel will have an influence.
From this morning till this evening, there may be a few isolated pockets of fog.
Still, otherwise, high-level cloud cover will increase this morning and throughout the day as moisture from the subtropics is drawn in from the southwestern flow aloft ahead of a frontal system associated with the 500Mb low located well east the northern California coast.
This frontal system rises north and weakens as it approaches north California this afternoon to influence the region.
It never connects with the subtropical jet stream, which remains far south over southern California and will surge into far southern Nevada by this afternoon.
Overall, this trend has resulted in milder weather over the region today, with temperatures in most areas reaching or above freezing. Temperatures in several parts of central Nevada may approach 40 degrees.
While a light inversion is anticipated to prevail in parts of the lower valleys of northern Nevada, maximum temperatures are expected to remain around freezing. Rain connected with the fading frontal system finds its way into the highlands of Humboldt County late tonight, where it is not entirely cut off from the Sierra Nevada Mountains.
Meanwhile, a new frontal wave is emerging and is expected to move northward into southern California by Wednesday afternoon.
In addition, a new emerging wave emerges in far northern California or southern Oregon, which is related to a deep 500Mb low-pressure system burrowing south off the coast of British Columbia.
Even though they are still distinct from one another, they are both expected to spread cloud cover over the region by Wednesday evening as they approach the area.