BTW, FAR 91.144 restricts flight operations when barometric pressure
exceeds 31 inch mercury. Any idea why? (note this restriction applies
to VFR traffic a well).


M wrote:
A very high pressure settled in Pacific NW:

KPSC 020453Z 31006KT 6SM BR BKN007 BKN075 M07/M08 A3066 RMK AO2
SLP389 T10671078

That's the highest that I've ever remember seeing.

I always thought that the NW seems to have larger pressure swings
(probably more so in Alaska). We can go from 2960 to 3060 in about two
days.