Significant end-of-season winter storm today – Friday – YubaNet


Widespread rain, heavy snow in the mountains and intermittent gusty winds today through Friday. Drier and milder conditions return this weekend and will continue into next week.


The trough continues to deepen over the region this morning with an isolated thunderstorm already occurring north of Redding. Later this morning, larger parts of the Sacramento Valley and adjacent mountains north of the Sacramento area may begin to see isolated thunderstorms.

During the afternoon is when the greatest threat to the entire region for thunderstorms will occur and a few scattered thunderstorms will be possible. The profiles still seem to produce heavy rain and small hail. The previous one produced heavy rain with about a third of an inch.

Nice wind shear on profiles also over most of the Sacramento Valley (best central and northern) so it could be an interesting day with some funnel clouds or a weak tornado. Activity is expected to continue into the evening before dissipating. Localized flooding will be possible with some of these storms today.

On Friday morning, the central part of the trough moves over Nevada with the trailing end of the trough still above the region. Showers are expected to continue but should gradually lessen over the course of the day ending in the evening.

The best odds continue to lie on the eastern side of the valley and adjacent foothills and mountains. This system continues to look like a very good late season precipitation event for the region with at least 1 to 2 feet of snow on the higher elevations, a half inch to an inch and a half of rain in the valley and 1 3 inches or more. for foothills and mountains. Thunderstorms may end up producing locally higher amounts.

On Saturday, a high pressure ridge will form over the region and bring temperatures back to near seasonal normals with high 70s forecast for the valley and mostly 50s in the mountains. Continued warming is expected on Sunday with highs warming mostly in the lower 80s.

In-depth discussion (Monday to Thursday)

Temperatures will warm into the upper 70s dropping into the 80s in the valley and mostly into the 60s for the mountain valleys on Monday. The ridge will begin to flatten as a trough begins to move into the Pacific Northwest. By Tuesday, a weak dry trough will be over California with slight cooling each day for Tuesday and Wednesday and valley temperatures cooling into the 70s. The far north of the state, including north end of the valley, may have a chance to see some precipitation at the end of this trough, but at this point it will most likely remain dry and windy for the next two days. A deeper trough will move over the region next Thursday, but at this point conditions appear to continue to be dry.


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