Pressure drop question

[THX]

Last night I noticed a pretty significant pressure drop from ~29.26 in to ~29.15 in a 15 to 30 minute span (at ~1:00 am).

I'm just not used to seeing spikes like this and was wondering if anyone else has experienced it and what meteorological conditions would cause such an event.

[hills]

I can't find the web site I was reading now, but as I live on the side of a mountain (well large hill anyway) I was investigating why the wind direction at my house is often coming from a completely different direction, sometimes opposite, to the prevailing wind and found a site that explained that mountains can affect the pressure, other than just due to height above sea level.

From memory (but don't quote me) the way I understood it was, after the wind has passed around and over the mountain, where it meets up on the other side it can increase the pressure in a very localised area. I guess that means there could be other pockets where the pressure was reduced as well??


While my pressure readings fluctuate I've never seen a spike like that though.

What is the terrain around your area?

[THX]

The terrain is relatively even. In other words we don't have hills or mountains around.

[steve]

Passage of a cold front, possibly.

[Great Cornholio]

While frontal passage could make sense it most likely was just a "fluke" reading. Unless there was a storm, but even then that seems like an almost impossible drop in pressure...especially since it went right back up.

Like hills said the wind and pressure..and even temp really can get affected by large hills, buildings, trees etc...wind would be the most affected. Although I noticed you're in the St Louis area so that rules out the hills messing with you.

Long story short..If I were a betting man I'd put my money on fluke reading.