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Is human activity to blame for climate change?
A recent debate between candidates for Congress in the Wisconsin’s 1st District — U.S. Rep. Paul Ryan, R-Janesville, and Democratic challenger Rob Zerban — included questions about the role of human beings in producing discernible changes in the climate over the last 150 years.
Unfortunately, this question, which is a matter of evidence, analysis and conclusion as all scientific questions are, has become a source of partisan political divide. Continue reading
What is the status of the ozone hole?
Ozone occurs about 18 miles above the surface. Ozone is both caused by and provides protection from damaging ultraviolet energy emitted by the sun. The development of an atmospheric “ozone layer” allowed life to move out of the oceans and onto land.
The ozone hole occurs high over the continent of Antarctica. It is not actually a hole, but rather the appearance of very low values of ozone in the stratosphere. Typically, the Antarctic ozone hole has its largest area in early September and lowest values in late September to early October. Continue reading
What is the meteorological origin of these beautiful fall days?
The beautiful, crystal clear early fall days that we have recently enjoyed are characteristic of September in southern Wisconsin.
Such days are often quite cool to start, with morning temperatures in the 40s, but often warm by late afternoon when temperatures can soar to the mid- to high 70s. Continue reading
Category: Meteorology, Seasons
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Do September temperatures foretell the nature of the winter?
After the recent abnormally cold period, which has left us 3.2 degrees colder than normal thus far in September, a lot of people have been wondering if September temperatures can be a harbinger of what is to come in the winter.
Everyone recalls last winter as a persistently cold season during which we experienced a four-month period (December 1 – March 31) with an average temperature that was 7.44 degrees below normal. Interestingly, last September was 2.7 degrees above normal and last October was 1.0 degrees above normal. Continue reading
Category: Climate, Meteorology, Seasons
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What is an equinox?
The equinoxes (from “equi,” meaning “equal,” and “nox,” or “night”) occur when the sun’s rays strike the equator at noon at an angle of 90 degrees.
In the Northern Hemisphere, the vernal or spring equinox occurs around March 20, and the autumnal or fall equinox occurs on September 22 or 23. Continue reading
