Dennis Mattinson’s Weather Forecast

Forecast: Owens Valley, Mammoth and Mono County

By: Dennis Mattinson, Weather & Atmospheric Forecaster


SierraWave Media: Radio – TV – Online News

FRI APR 05 2013

Dry weather today and tomorrow with partly cloudy skies as flat ridging takes hold. Now for Sunday and Monday, things have changed a little. The low we talked about has changed track and strengthened. So by Sunday night we go from a slight chance to a chance of showers in Mono County with snow levels lowering on Monday. The Owens Valley still looks to remain mostly on the dry side. Very windy for both counties on Sunday night into Monday, particularly for the Owens Valley.


Today: Mostly sunny becoming partly cloudy. Highs 69 / Lows 39. Winds NW 5 – 10 mph.

Saturday & Sunday: Mostly sunny becoming partly cloudy then mostly cloudy on Sunday. Highs 72 / Lows 41. Winds NW 15 – 25 mph Sunday night.


Today: Partly sunny then mostly cloudy. Highs 52 / Lows 29. Winds SW 5 – 10 mph.

Saturday & Sunday: Partly sunny Saturday then a 30% chance of showers on Sunday. Highs 44 / Lows 27. Winds W 10 – 15 mph G 25.


Today: Partly to mostly cloudy. Highs 56 – 66 / Lows 29 – 34. Winds W 10 – 15 mph.

Saturday & Sunday: Mostly cloudy on Saturday then a chance of showers on Sunday. Highs 56 – 66 / Lows 27 – 32. Winds W 10 – 15 mph G 30.


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8 years ago

thanks for the reply dennis. I get how the barometer measures the difference in atmospheric presure and how atmospheric presure is determined by the weight of the air molecules pressing down from the top of the atmosphere to the ground. What i dont get is why stormy weather produces lower presure than a clear day, to me a sky with water vaper in it should weigh more thus producing a higher atmospheric presure. so i guess what i’m asking is how does a stormy sky produce lower presure. thanks, from befuddled wheather amatuer.

8 years ago

had a question for mr. mattinson. I’ve always wondered why the barometer rises on clear days and drops on stormy days, so i did a little research and from what i can tell is clear air weighs more than stormy air which makes no sense to me because air with water in it should weigh more the dry air creating more atmospheric presure and higher barometer reading but its just the opposite. maybe you can explain it to me.

8 years ago
Reply to  salblaster

A barometer doesn’t measure the weight of the air, it measures pressure. So, typically on clear days, high pressure is the influence, thus the barometer raises. On stormy days, which typically is influenced by low pressure, the barometer falls.