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Windgrams and Local Lapse rate C°/1000'

Small clouds represent the expected LCL (lowest cloudbase). LCL is listed on the Blipspots
You may notice areas of white cross-hatching. These are times and levels where relative humidity > 95% so actual clouds are very likely there. Marine stratus seems to show up nicely.
The altitude scale is at best approximate.
The approximation is 32ft /1 Hpa. or every 10mb is about 320ft.
So 850 is usually around 5000feet. When pressure is generally low, 850 will be below 5000. Sea Level is 1014 ish, on average. The correspondence can easily change by 300feet over the course of a day, so think of these as relative altitudes, not absolute. [precise calculation]



Blipspots   |   Main Rasp Page | Main Blanchard Page   |   Main Ft. Ebey Page   |   Horizontal atmoshpheric slices loop over time.

The colors in the background represent the "local" lapse rate at each time and altitude. Red is unstable and if it continues up off the chart it will likely mean big showers and or thudnderstorms. When the unstable region only goes a bit above launch, that means strong thermals in that region. Where the background color shows, any lift will be either lucky or induced by winds hitting the terrain. See this link for a summary of the different ways we try to measure instability.

The reappearance of good lapse rates in the late part of the day just might represent glass-off conditions. Please let me know if that works anywhere.


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