Mariposa and Oakhurst possible rainfall of less than 0.10".
Yosemite Valley possible rainfall of 0.10" to 0.25".
Updated Monday Morning
September 15, 2019 - Light rain and high elevation snow is expected, north of Fresno County, this afternoon and evening.
Precipitation amounts in the northern portion of the San Joaquin Valley will be light.
The majority of this precipitation will fall this afternoon.
Area Forecast Discussion National Weather Service Hanford CA 224 AM PDT Mon Sep 16 2019 .SYNOPSIS... Significant cooling trend today as trough of low pressure ushers in cooler air. There is a chance of afternoon thunderstorms in the Sierra Nevada today near Yosemite NP; some snow showers may occur along the higher elevations of the Sierra Nevada as well. Another trough arriving Wednesday night/Thursday will keep Central California in the high 70s/low 80s before another warming trend this weekend. && .DISCUSSION... Incoming trough of low pressure will lead to much cooler weather across the San Joaquin Valley this afternoon with afternoon highs expected to be 12-15 degrees cooler compared to yesterday. As the trough moves inland, a few light rain showers may occur in northern Merced and Mariposa county this afternoon. Also this afternoon, some instability associated with cooler air aloft may help trigger a rumble or thunder or two in the Sierra Nevada near Yosemite National Park. Along with a slight chance of thunderstorms, a few light snow showers may occur this afternoon/evening with snow levels around 8500-9500 feet. A surge of stronger winds across the forecast area with the incoming trough are forecast to occur this afternoon and evening. A few wind gusts around 20-25 mph are possible this afternoon/evening in the SJ Valley, which could cause some blowing dust in the western portion of the valley. Stronger gusts of 45-55 mph are possible in Kern County just below the mountain passes. Therefore, a Wind Advisory will be in effect this afternoon starting at 2 PM through 11 PM tonight for the Lake Isabella/Tehachapi area, Indian Wells Valley, and the Mojave Desert. Tuesday will be a couple of degrees cooler throughout the forecast area, with afternoon highs progged to be in the 80-82 degree range with zonal flow aloft ahead of the next disturbance. Dry weather expected Tuesday through midday Wednesday, then slight chance showers near Yosemite NP in the Sierra Nevada as the upper trough begins to impact the region. Models are showing a chance of precipitation occuring throughout the day on Thursday across the Sierra Nevada, and a few of these showers may produce flurries above 8500 feet. Strong winds through the Sierra Nevada may occur with the passage of this trough, and some gusty winds may also occur in the SJ Valley/Kern passes Wednesday night into Thursday. After the trough exits the district, models begin to diverge on the upper air pattern somewhat, but general thinking is that a warming trend will occur starting Friday into this weekend.Source: NWS
