Re: Persistent Low over Midwest?

On Sun, 14 May 2006 23:43:28 GMT,
Ron Hardin <rhhardin@xxxxxxxxxxxxxx>, in
<4467C09D.7F31@xxxxxxxxxxxxxx> wrote:
+ What's causing this cold rainy low to sit isolated over the Great
+ Lakes for days, instead of moving somewhere else?

It is cut off from the normal mid-latitude flow in the upper levels,
so it sits and spins.

http://weather.unisys.com/upper_air/ua_500.html

You can go back thru the previous 72 hours and see a very slow
west-southwest motion. You can see there is a split flow occuring over
the Canadian prairie provences. The good news is that the low looks
like it is about to get picked up by the southern branch of that flow.

If so, it'll probably exit the CONUS over North Carolina/Virginia.

http://www.srh.noaa.gov/fwd/glossary/def/cutofflow.htm

--
Consulting Minister for Consultants, DNRC
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