Hi Everyone,
I have been hurting my brain trying to figure out how I set my sea level presseure for my WMR968 station and do the calulation stuff for Calgary, AB (Alt 3793 ft) can anyone walk me thru how to set this stuff please? 
Cheers'
Dave
Nothing to it!
1. Determine (a) the current station temperature and (b) the station temperature from
12 hours ago.
2. Compute the average of the above two temperatures.
3. Convert the average temperature to Kelvin by adding 273.1 to the Celsius value.
4. Compute the scale height H = RdT/g, where Rd = 287.1 J/(kg K) and g = 9.807 m/s2.
Be sure to record H to at least 4 significant figures (unless you are using MathCad, in
which case full precision is maintained automatically).
5. Compute the sea level pressure psl from
psl = p0 exp(z0/H)
where p0 is the observed pressure and z0 is the altitude above sea level where you made
your pressure observation (provided by the instructor).
6. The above procedure yields the standard sea level pressure that is used on weather maps.
But pilots are interested in another form of sea level-corrected pressure, called the altimeter
setting. It is computed in the same way as psl, but an assumed temperature profile
corresponding the U.S. Standard Atmosphere is utilized instead of the actual temperature.
The correction from observed pressure to altimeter setting is therefore always constant for
a low-elevation station like ours. The correction for this exercise will be given in class
by the instructor. Altimeter setting is always provided in inches of mercury rather than
millibars, so the procedure is to convert your observed station pressure to inches of mercury
(to the nearest 0.01”) and then add the specified correction to obtain the altimeter setting.
I told you it was easy!
But seriously, here is a "fill in the blanks" way to do it:
http://www.cs.drexel.edu/~dbrooks/globe/pressure.htmlor a google search on calculating the pressure:
http://www.google.com/#hl=en&source=hp&q=adjust+sea+level+pressure&aq=f&aqi=&oq=&fp=2755c6b3e9b2e9
