Thursday, August 21, 2014 07:25 AM
Wednesday saw temperatures finally drop into the lower 80° as a moderate Delta Breeze, along with a deep marine layer spread inland into Butte County. The high temperature on Wednesday afternoon only reached 83°, and the low Wednesday morning of 61°. I was down in Chico late morning into early afternoon, and the Delta Breeze was bringing some gusty southerly winds down in the valley, along with mild temperatures. Winds at this weather station reached a peak gust of only 7 mph.
This morning is currently running about 3° cooler than 24 hours ago as a dry northwesterly upper air flow is over us. The low temperature this morning has been 59°. The last time we saw the morning temperature below 60° was on the 5th of the month. High pressure is over the eastern Pacific, and low pressure over southern California. Barometric pressure is on the rise, and a decreasing Delta Breeze and marine layer will allow for temperatures this afternoon to be a bit warmer than Wednesday. The predicted high temperature for this afternoon is 85°. Normal for this time of year is 86°, so we won't be far from that number. The low tonight is forecast to drop to 62°. Winds will be southwesterly at 5-9 mph late this morning into the late afternoon, becoming northeast at 1-3 mph tonight under mostly clear skies.
An upper level trough will pass through the Pacific Northwest on Friday, which will likely increase the onshore air flow once again, and introduce a general cooling of the atmosphere. The afternoon high temperature is currently expected to only reach about 81°, and the low Friday night near 61° under mainly clear skies. Winds on Friday are expected to be out of the south at 6-10 mph, becoming northeast at 1-4 mph Friday night.
This weekend should see temperatures back on the rise as high pressure behind the Pacific Northwest trough build into the west coast. This warming is forecast to continue into about midweek, before another trough over the Pacific Northwest brings a possible cooling trend for later in the week, if the current forecast model holds true. High temperatures by the middle of next week are forecast to be near 87° during the afternoon.
On a side note, the long range GFS forecast model has been modeling for the last few days a Pacific hurricane off of Mexico to drift to the north by the end of this month and into early September. The moisture from this decaying hurricane is advertised by the GFS to turn inland somewhere near northern California or Oregon. We'll have to see if this scenario holds water as we near that timeframe. Have a great Thursday. Bob