Thunderstorms Possible in Mariposa County, Oakhurst and Yosemite National Park Today
June 3, 2019 - The National Weather Service Hanford Office reports a few strong thunderstorms are possible in Central California during the afternoon and early evening hours today.
In addition to frequent lightning, hail, heavy rain and gusty winds may accompany thunderstorms.
Any thunderstorm can produce intense rainfall which can lead to localized flooding.
Area Forecast Discussion National Weather Service Hanford CA 336 AM PDT Mon Jun 3 2019 .SYNOPSIS... Thunderstorms are possible in the mountains each afternoon and evening from this afternoon through Tuesday evening. High temperatures Wednesday afternoon will be around ten degrees above normal for this time of year. A cooling trend is expected Thursday through Friday as a storm system progresses eastward north of Central California. && .DISCUSSION... After another round of severe weather yesterday, the high res model guidance is showing convection finally starting to wane today. HRRR sim reflectivity is only indicating a few thunderstorms in the Sierra this afternoon. The upper level low pressure center that has been responsible for our active weather across the region over the past few days is continuing its southward trip to Mexico and then eventually into the central plains. Only slightly above normal temps today across the region. We will become warmer over the next few days as a short wave ridge builds in over the region starting Tuesday. We will be looking at the Heat Index Levels (HIL) over the next couple of days around 2 with some isolated 3 values. Temps will be flirting with the triple digits in the SJV. H500 heights will increase as well as H850 temps Tuesday and especially on Wednesday. We are marginal for an early season Heat Advisory for the SJV and Sierra foothills both Tuesday and Wednesday. Focus is more in the south valley on Wednesday for higher HIL values. Snow melt will increase on Tuesday and Wednesday across the Sierra and thus increase flows into area reservoirs. Dam officials will more than likely increase dam releases into valley rivers including the Kings, San Joaquin, Tule, and Kern rivers. We can not emphasize enough to try to stay away from the rivers due to the very cold water temperatures and fast speed of the flow of the river. Fortunately, the warm spell will be short lived. Convection will be limited to the Sierra on Tuesday and the high Sierra on Wednesday. A few isolated strong storms are possible according to SPC. Another very cold low pressure system in the Gulf of AK will move east into Western Canada on Thursday. The associated trailing cold front will push through the region with little or no precip expected as it moves through on Thursday. However we will see a significant cool down on Friday and continue through the weekend. Below normal temperatures are expected on Friday and then slowly warmup to near normal for Saturday and Sunday. Gusty winds are also possible along the west side of the SJV and through the Kern county mountain passes including Tehachapi highway 58 corridor. Temperatures will once again approach triple digits in the SJV on Monday, which will once again have an impact on area snow pack and river flows.Source: NWS
