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Dennis Mattinson

EPA Program Director, Weather Forcaster at Sierra Wave Media

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Articles

  • 22 hours ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-14.wavForecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – THU MAY 15 2025A subtle ridge will move thru Friday, bringing temps to near average and dry weather. But a return to late Spring will be short lived, as yet another system moves in over the weekend.

  • 2 days ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-13.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE MAY 13 2025Lighter winds today, with a big drop in temperatures, as the current system slowly moves out the area by Wednesday. With that, a gradual warming trend will ensue, moving up to normal for mid May.

  • 1 week ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-07.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – WED MAY 07 2025Warming and drying continues, with near record high temps in our area by Friday and Saturday. All due to a large scale ridge of high pressure building into our forecast area. How warm will those temps get? How about 90° in Bishop by Saturday.

  • 1 week ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/05/Weather-MAY-02.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI MAY 02 2025Mild weather today, then a longwave trough will approach the Western US Friday. That trough will track inland Saturday / Sunday and bring on showery type precipitation, with T-storms (generally favoring higher terrain) possible through about Monday.

  • 2 weeks ago | sierrawave.net | Dennis Mattinson

    https://sierrawave.net/wp-content/uploads/2025/04/SIERRA-APR-29.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE APR 29 2025Warming temps thru the rest of the work week, as high pressure nudges in. A weak system Wednesday / Thursday will bring a slight change and showers and TS to our area. By the weekend a broad trough expands from the PACNW, dropping down into the Great Basin.

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