Mariposa projected high temperature for Wednesday: 96 degrees
Oakhurst projected high temperature for Wednesday: 96 degrees
Yosemite Valley projected high temperature for Wednesday: 85 degrees
June 12, 2019 - The National Weather Service Hanford Office reports a recurrence of widespread triple digit heat is likely in the San Joaquin Valley this afternoon.
Prolonged exposure to triple digit heat can pose a health risk to the elderly, persons with respiratory ailments and anyone who is not yet acclimated to hot weather.
If you’re going to be outdoors during the hottest time of the day (between 1 pm and 6 pm), avoid strenuous exercise, stay hydrated and wear light colored, loose fitting clothing.
Remember that going from hot air temperatures into cold water in area rivers could cause shock to the body and lead to drowning.
Use caution if entering local waterways and remember to wear a life vest.
Area Forecast Discussion National Weather Service Hanford CA 348 AM PDT Wed Jun 12 2019 .SYNOPSIS...Another day of triple digit heat can be expected in the San Joaquin Valley, lower foothills and the Kern county desert. Temperatures will begin to trend slightly lower Thursday through the weekend and into early next week, but will remain between 4-8 DEG F above average. Isolated afternoon thunderstorms are possible near the Sierra crest beginning Thursday through next Wednesday. && .DISCUSSION... As of 2AM PDT, Shortwave IR satellite imagery is showing persistent upper level cloud cover over the CWA that is associated with a weak, broad upper level low centered at 35N/130W. With the cloud cover there is no surprise that current temperatures are still very warm across the area with mostly low 70s to even the low 80s in Bakersfield, Fresno, and Merced. The upper level cloud cover will persist through the morning, so many locations will have a warm start today with low temperatures up to 10 DEG F above average. Through this evening, the weak upper level low at 35N/130W will move into Northern California. This will start to introduce slight synoptic cooling as 500mb temperatures decrease around 1-2 DEG C. Despite this slight cooling, the onshore flow remains weak and dry and with the warm start to the day, the valley and desert will once again reach 100-105 DEG F and 70-85 DEG F in the Sierra. As a result, the Heat Warning has been extended through 8 PM PDT for locations in the valley. On Thursday into Friday, near-term models show a series of weak upper level lows moving through the Central California interior. Further synoptic cooling will translate into cooler temperatures, which will be some 5-10 DEG F cooler compared to the last few days. But, overall temperatures will still remain 4-8 DEG F above average for this time of year. High-Resolution models are also picking up on some showers in the highest locations of the Sierra on both days which will be mostly driven by diurnal heating, and better orographical lift. On Saturday models have a weak ridge moving through the area. This is followed by a weak trough setting up in the area on Sunday and Monday. Then toward Tuesday into Wednesday, another ridge starts to build into the area. Through this period, overall temperatures will be remain around 4-8 DEG F above average with continued chances of afternoon convection across the high Sierra. One final thing to note is that river levels throughout the Southern San Joaquin Valley will remain high through the period due to the continued snowmelt.Source: NWS
