KOMU.com https://www.komu.com/ KOMU.com Climate Statewide Climate Statewide en-us Copyright 2019, KOMU.com. All Rights Reserved. Feed content is not avaialble for commercial use. () () Tue, 15 Oct 2019 HH:10:ss GMT Synapse CMS 10 KOMU.com https://www.komu.com/ 144 25 Mid-Missouri's hottest September since 1897, explained https://www.komu.com/news/mid-missouri-s-hottest-september-since-1897-explained/ https://www.komu.com/news/mid-missouri-s-hottest-september-since-1897-explained/ Climate Statewide Mon, 30 Sep 2019 10:56:14 PM Kenton Gewecke, KOMU 8 Chief Meteorologist Mid-Missouri's hottest September since 1897, explained

COLUMBIA - The warmest September mid-Missourians will be able to remember just occurred. This is because no one from the 1800s is alive today, and the last time Columbia recorded a September as warm as 2019's was in 1897, a difference of 122 years. However, there are major differences in how both September 1897 and 2019 came to be at the top of the record book.

SEPTEMBER 1897

The month started with three days in the 100s (for actual temperatures, not counting for the heat index). In fact, a total of four days were in the 100s. Still to this day the month holds six high temperature records. There was a cool period that lasted seven days from the 16th to the 22nd when temperatures were either seasonal or below average. During that time, one morning recorded a low of 35º, which still holds the record low for that date. So, you can see, there were large swings in the temperatures throughout the month.

It was a very dry month. A half-inch of rainfall is all that recorded, and that fell over a consecutive 48-hour period in the middle of the month. Every other day was dry.

A reminder that dry conditions will produce large swings in temperatures and can allow temperatures to get both warmer (into the 100s) and cooler (into the 30s in this case) at night.

SEPTEMBER 2019

The only below average day was felt on the first day of the month. The end of August was below average and that carried over into September for one day. Then, everything changed. The remainder of the month experienced above average temperatures with the exception of eight days which were seasonal. While a low temperature was not broken, a highest low temperature was. The last day of the month recorded a low of 69º, which bested the previous 68º highest low from 1971. However, there were zero 100-degree days. In fact, the warmest temperature felt in 2019 as a whole was 95º.

It was a below average month for precipitation with only 2.52" falling over the Columbia weather station, which left the month 1.35" below the 3.87" average. 

The month also saw very little influence from frontal systems. The jet stream, our upper-level winds that tend to steer low-pressure systems our way from the Rocky Mountains, was well north of us. Because of this, nothing was able to stop our continued Summer. Showers every now and then, along with clouds, helped to keep temperatures steadily in the 80s and 90s; playing a role in keeping our low temperatures so warm, too. The steady southerly flow didn't hurt, either.

So, if 1987 had multiple 100-degree days and still holds records and 2019 has zero high temperature records, how are they tied for first place?

LOW TEMPERATURES

The nights over the course of 2019's September were 6.7º warmer than in 1897. Meanwhile, the high temperatures in 2019 were 6.7º cooler than in 1897. Hence, the tie. 

A note on low temperatures: one of the trends we have been seeing prominently in climate has been warmer nights. Since 1970, Columbia's low temperature is, on average, 2.4º warmer.

While summer has held on, Fall weather should finally arrive by the end of the week as the coolest temps since May move into mid-MO. 


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A conversation with the Missouri State Climatologist about climate trends https://www.komu.com/news/a-conversation-with-the-missouri-state-climatologist-about-climate-trends/ https://www.komu.com/news/a-conversation-with-the-missouri-state-climatologist-about-climate-trends/ Climate Statewide Thu, 19 Sep 2019 9:02:11 PM Kenton Gewecke, KOMU 8 Chief Meteorologist A conversation with the Missouri State Climatologist about climate trends

COLUMBIA - During the first week of Show Me Climate we've discussed many of the basics of our changing climate. We started with the difference between weather and climate, moved on to why the climate is changing so rapidly, dug into non-renewable and renewable sources of energy, saw the changes occurring around the world, and looked at data showing how weather is trending in a new direction, too. 

Here, I sit down with the Pat Guinan, the Missouri State Climatologist, for a conversation about the trends we've been seeing right here in the Show-Me State. You can watch the entire conversation above, or the simplified version that aired during a KOMU 8 News broadcast. 

Pat and I chat about the many trends we are seeing in Missouri, from warmer nights, warmer winters, wetter seasons, shorter seasons, longer seasons, agricultural impacts, and much more about the history and climate of Missouri. 

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This story is part of SHOW ME CLIMATE, an ongoing KOMU 8 series devoted to ethically explaining climate change without politics using fact-based data to deliver important information about our world and the Show-Me State.


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Climate change is also affecting weather trends https://www.komu.com/news/climate-change-is-also-affecting-weather-trends/ https://www.komu.com/news/climate-change-is-also-affecting-weather-trends/ Climate Statewide Thu, 19 Sep 2019 5:20:33 PM Kenton Gewecke, KOMU 8 Chief Meteorologist Climate change is also affecting weather trends
COLUMBIA — In an earlier story we discussed the difference between weather and climate. While they’re not the same thing, a changing climate does change weather patterns.
One thing I have to note before we get into this is that we still cannot link anthropogenic climate change (man-made climate change) directly to each weather system. Just because we have a terrible hurricane does not mean it is due to climate change. When a tornado is ravaging the earth, it cannot be directly linked. However, what we are seeing is more extreme weather. That means we are seeing stronger hurricanes more often. When it rains, it pours…causing more flooding. When it’s dry, it turns into a severe drought more frequently. So, while each singular weather system cannot be linked directly, overall we are experiencing more extreme weather more frequently, with less of the in-between.
As you know by now, the world is warming at an unnaturally rapid pace. Climate has warmed by 2-degrees Fahrenheit since 1880. And eighteen of the 19 warmest years all have occurred since 2001, with the exception of 1998. The year 2016 ranks as the warmest on record.
Each region of the world is changing differently. The good news is, some areas are still below average each year. Can you imagine a world where absolutely nowhere produced a below average annual temp? Talk about out-of-balance.
The central United States has been one of the cooler areas recently, including here in Missouri. There’s a reason for that…and it has to do with rain. When the ground and air are wet, the Sun's energy goes more into the moisture and evaporating that moisture than actually heating the air. So, when the air is drier (think desert-like), the temperature can reach into the 100s. However, when it is a wetter, more moist period, the temperature will stay lower, in the 90s, but the heat index and humidity will be higher, still resulting in dangerous conditions. This can also lead to warmer nights than if the air were dry.
In our warming world, it is important to note that for every 1°F of temperature increase, the atmosphere can hold 4% more moisture, which means there’s more available to fall as rain or snow. While some areas are dealing with an increased frequency in flooding, others have experienced prolonged extreme droughts. California’s 2015 drought cost billions of dollars.
When it comes to the tropics, category 4 and 5 hurricanes have all increased in frequency since the 1980s. In fact, the past 4 years have had five category 5 hurricanes to hit the United States: Matthew (2016), Irma (2017), Maria (2017), Michael (2018), Dorian (2019). Hurricanes have also been trending slower along coasts, stalling, and dumping record amounts of rainfall, and the other impacts that come with a hurricane standing still. New research on the track of hurricanes suggests hurricanes are increasingly stalling over coastal regions and dumping record rainfall because of this. Two recent examples are 2017’s Hurricane Harvey over Texas and Hurricane Florence over the east coast in 2018. I’ll note again this research does not link attribution directly to anthropogenic climate change. Regardless, it is a real trend that coastal regions will need to plan for because the as the climate continues to warm, this trend is expected to continue.
This isn’t only in the Atlantic, either. The past decade has recorded most of the strongest tropical cyclones worldwide.
You have probably noticed, our seasons are changing, too. The first freeze of the year is happening later and the last frost is happening sooner. That means the growing season is longer while winter is getting shorter. And yes, we will still continue to have winter! It is just shorter and warmer. It will still feature winter weather extremes, too. Remember, more moisture in the atmosphere also means more snow.
Overall, the Midwest is expected to deal mainly with extreme heat, drought, heavy downpours and flooding that will affect infrastructure, health, agriculture, forestry, transportation, air and water quality, and more. I’ll be digging into these on future Show Me Climate segments.

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This story is part of SHOW ME CLIMATE, an ongoing KOMU 8 series devoted to ethically explaining climate change without politics using fact-based data to deliver important information about our world and the Show-Me State.


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