Northern CA Forecast Discussion

Area Forecast Discussion
National Weather Service Sacramento CA
832 PM PDT Sat Apr 17 2021

Dry and warm weather through Monday. Temperatures will rise to the upper 80s to low 90s by Sunday for Valley communities. Despite the warm air temperatures, area waterways will continue to run cold. Cooler weather possible by middle of next week, with the chance of some mountain showers.


... Evening update: North/northeast winds in the Sacramento Valley today brought relative humidity values way down -- even lower than forecast. A sampling of minimum relative humidity values this afternoon include 6 percent at Sacramento Exec Airport, 7 percent at Sacramento Int`l Airport, and 7 percent at Chico. A combination of the upper level ridge, dry soils, lack of moisture in the air, and the katabatic/downslope winds allowed temperatures to soar well into the 80s for many Valley locations. Sacramento Executive Airport reported with one of the hottest readings at 89 deg F. Record high for the day was 90 deg F, so just shy of matching that. More of the same expected for Sunday afternoon, though some locations may add several degrees on top of today`s highs. // Rowe


... High pressure will strengthen over the region through Sunday. Temperatures will warm into the upper 80s for most places with some of the warmer spots reaching the lower 90s. Winds this afternoon will decrease this evening in the valley and are expected to stay light northerly on Sunday. Easterly winds in the mountains will increase again tonight with some local gusts around 45 mph for some of the favored wind prone areas before decreasing Sunday morning. Lighter winds with little change to some minor cooling for the daytime high temperatures are expected on Monday. We should see an increase in winds late in the day in the Delta that should persist through at least the evening hours as well. Tuesday a low pressure system will begin to move into the far part of the state. Some showers and maybe a few mountain thunderstorms may be possible with the best chances over the Southern Cascades south through Plumas County. This will also be the start of a noticeable cooling trend. Winds through the Delta should be stronger and persist throughout the day.


(Wednesday THROUGH Saturday)... No significant changes to the extended forecast. Ensembles and clusters continue to indicate weak trough with varying degrees of depth extending from the Great Basin region into Central California Wednesday. Will maintain NBM`s idea of light shower chances over the Sierra, but dry for Valley locations. A pattern like this will likely have limited moisture and be dependent on higher elevation instability. Heights will not be overly low in this pattern allowing Valley high temperatures to warm into the low 80`s. Ensemble guidance shifts trough into the Desert Southwest Thursday and Friday with drier and warmer conditions returning, as ridge builds back overhead. Extended ensembles indicate possible unsettled pattern heading into next weekend, but will we will see how this evolves over the next few days.

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