October 31, 2020 – Dry weather with above normal high temperatures will persist through next Thursday. Cooler with a threat of showers on Friday, mainly over the mountains.
Discussion
High pressure over the western states will shift eastward the next couple of days. A closed low off the Southern California coast will lift towards the northeast Sunday and Monday and may bring some high clouds to the region. Little change in temperatures is expected through Monday.
A weak trough on Tuesday falls apart before it reaches the northwest coast but may bring slightly cooler temperatures and breezy winds over the ridgetops.
Extended Discussion (Wednesday through Saturday)
High pressure returns to the region for Wednesday and Thursday to keep temperatures relatively the same both days and similar to earlier in the week. Friday and Saturday may be getting wetter and a lot colder as a deep trough of low pressure moves through the region. Currently there are timing differences within the models of about 6 hours. Both the European and GFS are indicating some rain within the valley. NBM may be under forecasting the amount and extent of the precipitation. Have precipitation chances for northern part of the valley and over the mountains for now but suspect chances will be going up for all areas if this pattern holds.