Dennis Mattinson

EPA Program Director, Weather Forcaster at Sierra Wave Media

Featured in: Favicon

sierrawave.net Favicon

mdpi.com

Articles

Dennis Mattinson / Sierra Atmospheric Forecaster June 4th

3 weeks ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/06/Weather-JUN-04.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – WED JUN 04 2025Additional rounds of showers and t-storms continue today, reducing Wednesday. There is enough moisture and instability in place to produce lightning strikes.
Dennis Mattinson / Sierra Atmospheric Forecaster June 3rd

3 weeks ago | sierrawave.net | Dennis Mattinson

Area Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE JUN 03 2025Continued slight chance of showers and t-storms today and Wednesday, as that slow moving cut-off low trudges along thru our area. North winds will persist thru today.
Dennis Mattinson / Sierra Atmospheric Forecaster May 30th

4 weeks ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-30.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI MAY 30 2025Our heat peaks today and Saturday, so Moderate HeatRisk is in order. Temps look to run near 15 degress above normal for the end of May. But a pattern shift looks likely Sunday, as the hot ridge breaks down as a mid level low drops South into our Region.
Dennis Mattinson / Sierra Atmospheric Forecaster May 29

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-29.wavForecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – THU MAY 29 2025Significant warming (near record territory for this time of year) is still on track for this Friday and Saturday, with those days the hottest of the week. As high pressure builds over the region, daytime highs move well upscale, to 100° in Olancha on Saturday and Mammoth Lakes 78°.
Dennis Mattinson / Sierra Atmospheric Forecaster May 28th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/Weather-MAY-28.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – WED MAY 28 2025The heat will be the main story thru the work week, particularly Friday and Saturday. All due to a dominant ridge stretched across the Western US. Look for abundant sunshine and temperatures running some 10 – 15 degrees above normal.
Dennis Mattinson / Sierra Atmospheric Forecaster May 27th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/Weather-MAY-27.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE MAY 27 2025Going thru this work week, high pressure continues to expand across the interior West. All-the-while low pressure dances off the coast of Baja.
Dennis Mattinson / Sierra Atmospheric Forecaster May 26th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-26.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – MON MAY 26 2025Over the weekend a mostly dry shortwave trough quickly moved thru CA-NV-AZ. Not much moisture with it, but it helped to keep temperatures in check. By the beginning of this week, a pseudo Rex Block pattern (high pressure over low pressure over the Western US) sets up.
Dennis Mattinson / Sierra Atmospheric Forecaster May 20th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-20.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – TUE MAY 20 2025A warming trend continues today, so it should feel a bit like early Summer. Expect temps in Bishop to hit 90° by Thursday. RH should be low this week, in the lower 20% range. The weekend looks dry, with the possibility of a trough moving thru the PACNW.
Dennis Mattinson / Sierra Atmospheric Forecaster May 19th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-19.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – MON MAY 19 2025After a blustery weekend, a warming trend begins today, as a ridge of high pressure builds in and remains anchored over the Desert SW. Expect your temps to push up to 92° by Thursday in Bishop. Nice conditions and those warm temps could persist thru this work week.
Dennis Mattinson / Sierra Atmospheric Forecaster may 16th

1 month ago | sierrawave.net | Dennis Mattinson

https://sierrawave.net/wp-content/uploads/2025/05/SIERRA-MAY-16.wavArea Forecast DiscussionOwens Valley / Mammoth Lakes / Mono County / Death ValleyDennis Mattinson / Sierra Atmospheric ForecasterSynopsis – FRI MAY 16 2025Near average temps, dry conditions and light winds today. By Saturday a trough will drop into the Great Basin, bringing precipitation to the Sierra, with snow levels about 8k feet. The Owens Valley looks to pick up a shower or two as well.