Mariposa projected high temperature for Sunday: 89 degrees, Monday: 75 degrees
Oakhurst projected high temperature for Sunday: 89 degrees, Monday: 76 degrees
Yosemite Valley projected high temperature for Sunday: 82 degrees, Monday: 68 degrees
September 15, 2019 - The National Weather Service Hanford Office reports much cooler weather is coming to Central California early next week!
High temperatures Monday afternoon will generally be five to eight degrees below normal for this time of year.
Area Forecast Discussion National Weather Service Hanford CA 310 AM PDT Sun Sep 15 2019 .SYNOPSIS...Temperatures will continue to run warmer than normal over the central California interior today. Monday will be much cooler with a chance of showers north of Fresno county and mainly over the Sierra. Temperatures will then remain below normal for the remainder of the week. && .DISCUSSION...The large upper ridge over the western CONUS that was responsible for the widespread triple digit heat across the San Joaquin Valley and Kern County Deserts on Saturday is now weakening as an upper trough takes aim at the PAC NW. IR imagery is indicating increasing high clouds pushing into central CA from the southwest. Fort Ord profiler is indicating a deepening marine layer which is now around 1500 feet deep. The combination of increased clouds and marine intrusions along with height falls will result in cooler daytime temperatures today although temperatures will remain above seasonal normals for one more day. SREF indicating the trough will move inland across the PAC NW and Norcal on Monday although the latest model runs are indicating that this system will not be as strong as previously advertised as a system behind it has been siphoning off some energy from it. This system will bring much cooler temperatures to our area with daytime highs across most of our area expected to be 10-15 DEG F lower than today. Some precipitation will also be possible with this system, mainly from Fresno County northward on Monday afternoon and evening. Most locations from Fresno County northward are expected to pick up between a trace to a few hundredths of an inch of rainfall with up to an inch of snow possible above 9000 feet in the Southern Sierra Nevada. Another impact from this system is that it will produce increased winds near the crest of the Southern Sierra Nevada on Monday afternoon and evening with local gusts as high as 75 mph. The SREF has backed off on winds over the Kern County Mountains and Deserts as the upper jet support remains further north. The trough is progged to move east into the Great Basin by Tuesday morning giving way to decreased winds and another relatively mild day across our area. The medium range models are now trending stronger with another trough that will push across Norcal on Wednesday Night and Thursday. This will bring another round of increased winds to our area along with a slight chance of precipitation to the Yosemite area. This system will also bring another surge of cooler air to our area and keep temperatures below seasonal normals through the end of the week even as our area dries out again on Friday and Saturday.Source: NPS
