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Climate

What is atmospheric stability?

As I reflect, it was Severe Weather Preparedness Week— March 6-10, 2023. We have already had severe weather this year, but it will become more frequent now that spring is around the corner. Sometimes when thunderstorms are forecast, you will hear weathercasters talking about the atmosphere being...
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No two fogs are the same

We are bound to have fog from time to time. I still remember when I was in my late teens and insisted on going to see some friends when I could barely see the edge of the road. My parents were not happy. Some areas, such as San Francisco or London, have fog more often. The cause of fog can depend...
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Rolling on an atmospheric river and the Pineapple Express

California has recently been slammed with extreme rainfall and snow in the high elevations, along with high winds. Media have attributed these events to an atmospheric river, but what does that mean? What is an atmospheric river? The ones that affect California occur when the polar jet stream...
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What’s the difference between snow, sleet, and freezing rain?

Winter precipitation is on its way. Rain, snow, sleet, and freezing rain are all potential types of precipitation. Rain is liquid water, while the other three are frozen at the end of their atmospheric journey. So, if snow, sleet, and freezing rain are all frozen water, what’s the difference?...
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How do volcanic eruptions affect climate?

A large underwater volcano recently erupted in the South Pacific. Volcanoes can send huge amounts of gases and ash into the atmosphere. Very large eruptions can affect the climate. In 1815, one of the most powerful volcanic eruptions in the last several thousand years occurred in the South Pacific...
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What really is La Nina?

You’ve probably heard these weather terms many times - El Nino and La Nina. They seem to affect our weather and they come and go. Are they normal to occur? Where do they occur? Why does it affect our weather? What is La Nina? In this post, I’ll focus on La Nina since that is what will likely...
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Fall and winter forecast looks mild, but keep mittens close

We're moving into fall and looking ahead, the outlook for winter temperatures continues the trend toward warmer temperatures.                     La Nina  One of the drivers could be a return of La Nina, which you hear about every few years. A La Nina event occurs when there is a...
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How does corn affect Midwest weather?

As I write this article, corn has tasseled on about 80% of fields in Central Illinois. Apologies to those with corn pollen allergies! Corn, just like other plants, experiences evapotranspiration (ET)Evapotranspiration is when water is taken up by corn plants,...
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What to expect when jet streams overlap

Early spring in Illinois can be a battle between the last of cold winter weather and the mild air of spring. On relatively rare occasions in March, we can experience warm, muggy air that normally doesn’t reach us until April or May. When this occurs early in spring, it’s best to be on guard for...
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Winters in the late 70s were ones to tell your kids

I’m now at the point in my life where I know others look at me and think I’m old. For truth in advertising, I’m currently 61; actually 61 ½, but the pleasure in saying the ½ left many decades ago. I can talk about my weather experiences with a sense of sage nostalgia. Case in point, I lived...
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Are average temperatures 'normal'?

You’re watching a local weather forecast or checking it online when you notice it says temperatures will be 'above normal or below normal.' But what does this actually mean? Normal is Average In most cases, the word 'normal' is used in place of 'average.' Average Daily Temperature...
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Do we need to fear the polar vortex?

Two words people have learned to dread in the past few years is "polar vortex."  People may not know a lot about what that is, other than it usually means we may be in for some bitterly cold temperatures.  The worst outbreak in my experience was December 23, 1983. I had just finished my graduate...
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