AFM, Thanks for that lesson (it actually was very helpful for future events), but I think it has become a different case this afternoon. The high pressure area has actually strengthened even further today...Air Force Met wrote:Extremeweatherguy wrote:1039mb high in NW Canada has strengthened to 1041mb overnight...
http://www.hpc.ncep.noaa.gov/sfc/satsfcnps.gif
OK...met lesson:
A two MB change overnight on the sfc chart is diurnal...not strengthening.
Here is the "rules of thumb" to use (or at least the ones they taught us back in the old days):
Below the LND (SFC, 850 charts), expect a 2-3 MB rise in pressures on the 12z chart and a 2-3 mb drop in pressure on the 00Z chart due to dirunals (if you are compairing the previous 12 hr chart). On the 850...expect a 10-20 meter rise on the 12Z & a 10-20 meter drop on the 00Z.
Above the LND...on the 700, 500, 300..etc....expect a 10-20 meter DROP in heights on the 12Z chart and a 10-20 meter rise on the 00Z chart.
This is useful during hurricane season if you want to see if a high over the SE US is breaking down or not. If the 12Z chart at 500mb showes height falls of 20 meters...then what you actually have is no height falls at all.
If...on the other hand...you have the same heights on the 12z cahrt...then you actually have 10-20 meter height rises.
But...+2 mb change on the "cold chart" (which is what the 12Z chart is called) is not a change...it's static....just like a -2mb change on the "hot chart" (the 00Z chart).
http://www.hpc.ncep.noaa.gov/sfc/satsfcnps.gif
The high is now up to 1045-1047mb this afternoon. That is a lot stronger than in what yesterday (a 6-8 mb rise), and as far as I can see, it is also much stronger than was expected.
What is your take on this AFM?