Projected high temperatures for Mariposa for Thursday and Friday: 77 Degrees and 80 Degrees
Projected high temperatures for Oakhurst for Thursday and Friday: 79 Degrees and 80 Degrees
Projected high temperatures for Yosemite Valley for Thursday and Friday: 68 Degrees and 69 Degrees
April 18, 2019 - The National Weather Service Hanford Office reports maximum temperatures this afternoon will be around ten degrees warmer than yesterday afternoon.
High temperatures Friday afternoon will be about fifteen degrees above normal for this time of year.
The daily record for maximum temperature ever measured in Fresno on April 19th is 93 degrees, established in 1950 and most recently observed in 2009.
Temperature records at Fresno date back to 1887.
Area Forecast Discussion National Weather Service San Joaquin Valley - Hanford CA 309 AM PDT Thu Apr 18 2019 .SYNOPSIS... A ridge of high pressure will progress eastward across the Western United States today through Friday, resulting in high temperatures well above normal for this time of year. Maximum temperatures this weekend should return to near normal values for late April as a feeble storm system brushes the Southern Sierra Nevada. A significant warming trend is expected early next week. .DISCUSSION... An upper-level ridge of high pressure will move eastward over California today, before progressing eastward through the Great Basin tonight. An area of low pressure aloft will weaken as it approaches Southern California Friday. This atmospheric impulse will remain well south of Central California. Maximum temperatures this afternoon will be about ten degrees warmer than yesterday afternoon. As far as Friday afternoon is concerned, several locations throughout the San Joaquin Valley will see temperatures reach the 90 degree mark for this first time this year. This is about fifteen degrees above normal for this time of year. To put this in perspective, the daily record for maximum temperature ever measured in Fresno on April 19th is 93 degrees, which was established in 1950 and most recently observed in 2009. Temperature records at Fresno date back to 1887. A rather weak, upper-level trough of low pressure will approach the Pacific Northwest Friday night. This trough of low pressure aloft should deepen Saturday as it brushes the Southern Sierra Nevada. It looks as if precipitation associated with this atmospheric disturbance will remain confined to the Southern Sierra Nevada. Snow levels should be around 9,000 feet. Minimal precipitation is expected in the Southern Sierra Nevada Saturday as snow amounts should be less than one inch, with rain amounts of less than one tenth of an inch. A Wind Advisory may be required for the Kern County mountains and desert Saturday afternoon into early Saturday night. The aforementioned, upper-level trough of low pressure should stall over the Great Basin Sunday into Monday afternoon. A ridge of high pressure will build northeastward across Central California Monday night through Wednesday, resulting in a significant warming trend. By Wednesday afternoon, the vast majority of locations in the San Joaquin Valley should see maximum temperatures in the lower 90s.Source: NWS
