April 9, 2019 – Lingering showers over the mountains will diminish by this evening. Gusty north wind develops through the valley today. Dry weather expected Wednesday. Another system may bring some showers to the mountains Thursday.
Discussion
Cold front has moved south into central California while the upper trough is moving across NorCal early this morning. Radar indicates showers have ended for the most part over the valley while extensive showers continue across the northern Sierra where the snow level has lowered below the higher pass levels leading to some snow accumulation across the highest terrain. Current temperatures are running around 5-10 degrees cooler compared to 24 hours ago and range from the 30s in the mountains to the 50s across the Central Valley.
The flood advisory for south-central Shasta County continues as runoff from Monday’s thunderstorms continues to work its way downstream east of Redding. Cow Creek near Millville appears to be currently cresting at around 27k cfs after rising from 2k cfs early Monday evening.
Upper trough will shift east into the Great Basin today with remaining showers over the Sierra expected to diminish from the north during the afternoon. Ridging expected to result in dry weather across the region Wednesday.
Breezy north winds develop through the valley today and will continue Wednesday. Gusts of around 25-35 mph can be expected this afternoon and again on Wednesday afternoon.
A “slider” system will drop down from the north on Thursday bringing scattered showers to the mountains that will continue into Friday. The remainder of the region is expected to remain dry.
Extended Discussion (Saturday through Tuesday)
High pressure ridging on Saturday will bring generally dry and warm weather, with high temperatures in the Valley and Delta in the mid 70s. Models and ensembles are in good agreement that a weak disturbance will bring a slight chance of precipitation Saturday night over the northern mountains, spreading into the Sierra on Sunday. Rain and snow amounts are expected to be light.
A somewhat stronger shortwave will bring more widespread precipitation on Monday. Uncertainty is a little higher for Tuesday, but a general possibility of light precipitation continues across much of the area, mainly focused over mountains and to the north. No significant impacts are evident at this time.