I like to watch a show called Weather World. It is presented by the Meteorogical Staff at Penn State and is available on PCN Network which is Pennsylvania’s version of C-SPAN. They broadcast from Monday to Friday at 5:45pm barring problems or pre-emptions for politics. Last Friday they had a broadcast problem since they broadcast live and send their Microwave signal to Harrisburg from State College. PCN has stock 15 minute features if this happens. Well, it happened Friday. The feature they presented was a 30 year cycle of winters going back to 1900. What they showed was how warm and cold winters cycled approximately every 30 years. In each cycle the 30 year period had a predominant warm or cold feature about it. (I went to their site, but the video isn’t available)
In searching for the video I came across this little gem that took what was explained on Friday, and went about 20 centuries of information of cycles of weather. It’s an interesting read along with the companion piece. It’s from a Finnish researcher:
Sunspots: The 200-year sunspot cycle is also a weather cycle.
A 2000-year historical perspective.
– The Roman Empire and its demise.
– The Mayan Classic Period.
– When the Nile froze in 829 AD.
– Why is it Iceland and Greenland and not vice versa?
– Tambora did not cause it.
– The spotless century 200 AD.
– The recent warming caused by Sun.
– The 200-year weather pattern.
Excerpts from the article:
If we take the Schove estimates of the maximum magnitudes (R(M)) from the period 1500-1750 and the measurements from 1750, we get (the rounding for exact centuries done only to make the general picture clear):
1400-1520 ? cold (Sporer minimum)
1520-1640 107 warm
1640-1700 61 cold (Maunder minimum)
1700-1805 114 warm
1805-1925 95 cold (Dalton minimum)
1925-2010 138 warm
2010-2110 ? cold?
Read this all here:
Then read this:
ooops edit for catagories