anyone else?

[Flying Illini]

Pretty low altimeter settings today across the midwest.
We ran the gamut<?> today with 29.22 out of KDET (Detroit City) being the lowest.
The highest was 29.92...above FL180

 

[EagleRJ]

Affirmative.

It was 29.51 today in ORD. These wintertime low pressure systems tend to do that for some reason in the northern US, but not in the south. Even when hurricane remnants come ashore in the South, the altimeter settings aren't much below 29.60 or 29.50. I wonder why that is?

 

[Dan CFI/CFII]

28.88 for me today. There was even a Falcon crew who was having some issues with a grumpy center controller (they kept asking for him to double check the altimeter setting).

This was in an area where airports start with P though.


Dan

 

[rvsm410]

Why Lower ALT in the North

Affirmative.

It was 29.51 today in ORD. These wintertime low pressure systems tend to do that for some reason in the northern US, but not in the south. Even when hurricane remnants come ashore in the South, the altimeter settings aren't much below 29.60 or 29.50. I wonder why that is?

Low pressure areas in the northern regions are closer to the Polar Jets and have a tendency to become "wound tighter" closer Isobars", as they usually ride the northern side of Polar troffs or ridges. The Jet stream's speed and the resultant friction on the air mass causes the low to spin faster....

Hurricanes, on the other hand, are formed more do to interaction of warm ocean currents, summer convection and the coriolis (sp?) effects... and can cover much larger area's than the northern lows normally due.