01-22-2017, 06:29 AM
Why it’s not windy on our mountain’s summits with this event.
The answer is simplified for ease of understanding. A dome of ( relatively ) warm, dry, stable, subsiding air is moving across the North Central Pacific. Do you remember that rare crystal clear day here a few days ago- Last Sat. I think? The center of the dome was directly overhead. Now we’re on the edge of that dome.
When the center of the dome is overhead the inversion is strong and low in altitude -Inversions;
https://en.wikipedia.org/wiki/Inversion_(meteorology)
Determine inversion here;
http://weather.rap.ucar.edu/upper/phto.gif
I think the inversion was around 2-3k when the wx was so clear here. Then a disturbance or cold front comes along and raises the inversion. This creates weak spots on the edge of the dome. And the dome is more uniform when it moves across the flat ocean. This changes dramatically when the dome encounters obstacles like mountains.
On Friday the inversion here rose to 7k and is predicted to rise to 10k or higher- but still below the summits. Inversions mark the weight of the air above. The heavier the air the lower the inversion. Currently the center of this dome is at 33 N Latitude at 1031 mb. The dome is weakening as it fills the Storm Low off the West Coast. The winds at the surface correspondingly are weakening also. When the inversion rises above the summits then clouds and precipitation can develop there.
Currently the summits are in the part of the dome where the air is strongly subsiding but more by weight than by air movement. The surface is where the air masses are mixing and if you can visualize where the air is flowing out from the dome-much like a whoopee cushion. Lots of storm damage across the state especially Northern islands and areas;
http://khon2.com/2017/01/21/downed-trees...oss-state/
A cool resource- this illustrates very well where the wind is and if you’re into comparing the different wx models this one’s good for that-click on compare forecasts ;
https://www.windytv.com/19.580/-155.193?...-155.193,8
Tuesday night/Weds. winds will start to ramp up there as the jet stream sags South, bringing strong Northerly flow aloft on the eastern flank of a dome- summit winds will increase;
http://www.stormsurfing.com/cgi/display_...a=npac_250
At that time you’ll have high winds but it’ll be (relatively)calm at the surface-a reverse of current conditions.
The answer is simplified for ease of understanding. A dome of ( relatively ) warm, dry, stable, subsiding air is moving across the North Central Pacific. Do you remember that rare crystal clear day here a few days ago- Last Sat. I think? The center of the dome was directly overhead. Now we’re on the edge of that dome.
When the center of the dome is overhead the inversion is strong and low in altitude -Inversions;
https://en.wikipedia.org/wiki/Inversion_(meteorology)
Determine inversion here;
http://weather.rap.ucar.edu/upper/phto.gif
I think the inversion was around 2-3k when the wx was so clear here. Then a disturbance or cold front comes along and raises the inversion. This creates weak spots on the edge of the dome. And the dome is more uniform when it moves across the flat ocean. This changes dramatically when the dome encounters obstacles like mountains.
On Friday the inversion here rose to 7k and is predicted to rise to 10k or higher- but still below the summits. Inversions mark the weight of the air above. The heavier the air the lower the inversion. Currently the center of this dome is at 33 N Latitude at 1031 mb. The dome is weakening as it fills the Storm Low off the West Coast. The winds at the surface correspondingly are weakening also. When the inversion rises above the summits then clouds and precipitation can develop there.
Currently the summits are in the part of the dome where the air is strongly subsiding but more by weight than by air movement. The surface is where the air masses are mixing and if you can visualize where the air is flowing out from the dome-much like a whoopee cushion. Lots of storm damage across the state especially Northern islands and areas;
http://khon2.com/2017/01/21/downed-trees...oss-state/
A cool resource- this illustrates very well where the wind is and if you’re into comparing the different wx models this one’s good for that-click on compare forecasts ;
https://www.windytv.com/19.580/-155.193?...-155.193,8
Tuesday night/Weds. winds will start to ramp up there as the jet stream sags South, bringing strong Northerly flow aloft on the eastern flank of a dome- summit winds will increase;
http://www.stormsurfing.com/cgi/display_...a=npac_250
At that time you’ll have high winds but it’ll be (relatively)calm at the surface-a reverse of current conditions.