Saturday, September 20, 2014 07:24 AM
High pressure is over Northern California, and an upper area of low pressure along the Central California coastline. Some wraparound moisture from this low brought some Cumulus clouds to the area on Friday which spawned a few light showers over a few higher mountain areas. This location saw a high temperature of 85° Friday afternoon.
This morning is mostly clear and running a few degrees warmer than 24 hours ago as the ridge of high pressure and the upper low off the coast remain in place. The low temperature this morning has been 61°. Humidity levels are in the mid-70% range this morning, with dew points running in the low to mid-50° range.
The low is forecast to begin to shift to the northeast later today into tonight. This shift may bring a "slight" threat of some precipitation to Magalia as the low is nearest to our area, but is currently only expected to be a 5% chance late tonight into mid-afternoon on Sunday. That's a 95% chance of no water falling out of the sky. Most of the precipitation, if any, will be confined to the mountains and foothills image left.
The high temperature this afternoon is predicted to be slightly cooler than yesterday, with a high temperature reaching about 83°, and a low tonight near 64° under clear to partly cloudy skies (and no electricity). The normal temperature range for this time of year (measured at De Sabla Res.) is 82°/48°. Add a few degrees to those numbers for lower Magalia.
Winds this morning are very light out of the northeast, running 1 mph, and gusts only reaching 2 mph. Winds this afternoon are predicted to be southwesterly at 5-7 mph, turning back out of the northeast later this evening at 1-3 mph.
Sunday should see clear to partly cloudy skies and slightly cooler temperatures. The upper low should be in Nevada by Sunday, with a continued slight 5% chance of a shower as wraparound moisture flows to the west. Temperatures will drop a bit over today as a cooler airmass associated with the upper low spreads across the area. The high temperature at 2400' is forecast to reach about 81°, and the low Sunday night near 64°. Winds on Sunday afternoon are forecast to be southwesterly at 5-7 mph. Winds should return to the northeast at 1-3 mph by Sunday evening and continue into the night.
Monday into Tuesday looks to be fair and mild. A trough off the coast will continue to shift towards the coastline, but no precipitation is predicted for either day. By Wednesday, the trough should bring increasing clouds, leading to a chance of rain by morning, but likely holding off until at least the afternoon hours. There's currently expected to be a 10% chance of measurable precipitation on Wednesday morning, increasing to a 20% chance by late morning into the evening. Those odds rise to a 25% chance by late Wednesday night into Thursday night. A chance of rain showers are currently expected to persist into Friday as a broad trough of low pressure drops out of the northwest. Temperatures are expected to drop below normal by midweek, and continue through the end of the week. By Friday, the high temperature is only predicted to reach about 67°. Have a great weekend. Bob