posted on Nov, 6 2005 @ 03:04 AM
I will try and explain this in english lol. The greater the pressure differential in a given distance the greater the winds. You are basically
squeezing air between the pressure points. Its like having a sprayer on a garden hose instead of having the end wide open. What happens if you turn
the water on full blast and just hold the hose? Water streams out 5 or 6 feet. Now put your thumb on the end and cover half the opening. The water
starts the spray. You are now trying to force the same amount of water through a smaller opening. The water has to move through quicker to allow the
flow to continue.
Its the same type of thing that allows the Santa Ana winds to work and how downtown metro areas get really windy when the wind is squeezed between the
This is about the easiest way I can explain it. The greater the pressure difference the stronger the winds. It doesn't have to be just the NAO.
Watch the next time a strong winter storm moves through. Check the pressure in the low and then compare it to the high pressure that moves in behind.
The low might be 29.20" and the high 30.75". Thats a significant difference and the closer the low is to the high the stronger the winds will be
wrapping around the back side of that low.
Here is a visual....
Check that link. That is a map of the infamous Storm of the Century. See all those green lines? Those represent lines of equal pressure. There
are alot of lines between that low on the coast which is as deep as a hurricane and that significant high over North Dakota. The clockwise circulation
of that high combined with the counterclockwise circulation of that massive low is squeezing alot of air between those points. Result...
Clear as mud?