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Dennis Mattinson

EPA Program Director, Weather Forcaster at Sierra Wave Media

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Articles

  • 1 week ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/04/Weather-APR-18.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI APR 18 2025An upper level ridge takes over today, leading to drier weather. So overall nice weather thru the weekend. Keep in mind that this is still April, and we have a series of disturbances moving thru to our North.

  • 1 week ago | sierrawave.net | Dennis Mattinson |Dennis Weather

    https://sierrawave.net/wp-content/uploads/2025/04/SIERRA-APR-16.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – WED APR 16 2025Warm weather continues today. Chances of SH / TS over the mountains will start today as well, as a slow moving closed low brings light mountain snow (snow level in Mammoth ~9K feet), gusty winds and cooler temperatures, today thru Friday.

  • 1 week ago | sierrawave.net | Dennis Mattinson |Dennis Weather

    https://sierrawave.net/wp-content/uploads/2025/04/SIERRA-APR-15.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE APR 15 2025A multi day period of afternoon SH / TS (showers and thunderstorms) begins today, as warm air overlaps moisture moving in from SOCAL. So our warm weather looks to take a back seat to a slider type trough moving in over the area from the coast.

  • 2 weeks ago | sierrawave.net | Dennis Mattinson |Dennis Weather

    https://sierrawave.net/wp-content/uploads/2025/04/SIERRA-APR-11.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI APR 11 2025Temperatures peak today at 85° in Bishop. To put that in perspective, the average temp in Bishop today is 70°. After today, those temps begin to slide back to near average, as a trough will swing by just to our North, over the weekend.

  • 2 weeks ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/04/Weather-APR-10.wavForecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – THU APR 10 2025Our on-going warming trend will continue this work week. This will give us a taste of Spring for sure. Currently H5 heights are running between 582 – 584 dm. So expect temps to climb to 15° above normal in our Forecast Area.

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