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post #1 of 6 Old 10-13-2013 Thread Starter
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Winter Weather Indicator

The 564 line moving down like a curtain closing summer.
http://weather.noaa.gov/pub/fax/PPAM50.gif

That is one huge scary looking low in the N. Atlantic.

Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.

Last edited by smurphny; 10-13-2013 at 07:16 AM.
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post #2 of 6 Old 10-13-2013
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Re: Winter Weather Indicator

Since this is a 500mb map, 18,000ft, it represents weather conditions in the mid- troposphere and not too much of an indicator of what's happening on the surface.
Try North Atlantic Surface Map, which is the north Atlantic surface map or Atlantic Graphical Tropical Weather Outlook which is a satellite view, and you'll see it's much less of a tightly wound system, at this time, down here where we live.

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post #3 of 6 Old 10-13-2013
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Re: Winter Weather Indicator

I never liked the North Atlantic, and for several good reasons. When I was a kid in the U.S. Navy our ship seemed to always be going there and ever time we did we got our ass kicked with high winds, cold weather and towering seas. It was a nasty place to be on a good day. Never once in four years saw the North Atlantic calm.

Unfortunately, the Florida Keys are not in the cards for me yet - but one day soon!

Gary
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post #4 of 6 Old 10-13-2013 Thread Starter
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Re: Winter Weather Indicator

Quote:
Originally Posted by capta View Post
Since this is a 500mb map, 18,000ft, it represents weather conditions in the mid- troposphere and not too much of an indicator of what's happening on the surface.
Try North Atlantic Surface Map, which is the north Atlantic surface map or Atlantic Graphical Tropical Weather Outlook which is a satellite view, and you'll see it's much less of a tightly wound system, at this time, down here where we live.
The 500mb is a great indicator of system movement. It gives a very useful indication of the general trend of weather, much more so than surface analysis charts which are useful for current weather conditions and MAYBE a couple of days out. When you see the 564 line moving south, it is a reliable indicator of colder, windy weather with a lot more northern wind direction. That's specifically why I posted this particular chart.

There is a good explanation of how to use the 500mb charts here:Mariners Weather Log Vol. 52, No. 3, December 2008

Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
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post #5 of 6 Old 10-13-2013
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Re: Winter Weather Indicator

I have another indicator, probably a result of great divide between summer and winter - the 564 line. Thats the line of the 'equinoctal gales'.

Indicator - Geese are now arriving en-mass on the Chesapeake. Nothing moves geese as well as iced-over water/ponds/lakes. Lots of loons and black backed gulls, too.
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post #6 of 6 Old 10-14-2013 Thread Starter
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Re: Winter Weather Indicator

Have been hearing geese flying over for a couple of weeks now, headed your way. We're past leaf-peeping season up here. One good blow and most of the leaves will be down. Then we'll be in what we call "stick season," a quiet time of year when all the tourists go away in between fall and ski season.

Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.
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