Climate change to decrease average number of mild weather days


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Residents enjoy pleasant weather at Noelridge Park in Cedar Rapids, Iowa. (Louis/flickr)
Jenna Ladd | January 24, 2017

The first of its kind, a recent study found that climate change is likely to decrease the number of “nice weather” days worldwide.

The authors of the study, scientists from the National Oceanic and Atmospheric Association and Princeton University, define “nice” or “mild” days as those days when temperatures are between 64 and 86 degrees Fahrenheit, dew points are below 68 degrees Fahrenheit and less than half of an inch of rain falls. Currently there are an average of 74 nice days globally per year, but that number is likely to drop to 70 in the next twenty years and to 64 by 2081.

Karin van der Wiel is a postdoctoral researcher at Princeton University and lead author of the study. She said,

“We used a climate model to simulate the current climate. In that simulation we counted the number of mild days. Then, we increased greenhouse gases in the climate model to simulate the future effects of climate change. This leads to increasing temperatures, changes in humidity, changes in precipitation over the whole world and with very specific patterns. In this new, future climate, we counted the number of mild days again. We could then calculate the change — increase or decrease — of mild weather days for each location globally.”

Not all corners of the Earth will be affected equally, however. Tropical regions are expected to lose the most nice days, with some areas losing up to 50 per year by the end of this century. Meanwhile, London is expected to gain 24 nice days each year.

Predictions for Cedar Rapids, Iowa mirror global averages. Eastern Iowa currently enjoys 76 nice days annually; researchers say that number is expected to drop to an average of 72 between 2016 and 2035 and to 66 each year between 2081 through 2100.

Frequent high humidity makes it tough for Iowa to meet the pleasant weather criteria outlined in the study. Absolute humidity has risen by 13 percent during the summer months in Des Moines since 1970, according to Iowa State climate scientist Gene Takle. Increased humidity also contributes to the extreme rain events that have plagued Iowa in recent years.

van der Wiel said, “Mild weather is something everyone knows, experiences, and has memories of,” she continued, “Our study shows that human-caused climate change is going to lead to changes in mild weather all over… The changes are happening now, and where people live.”

2016 marks third consecutive hottest year on record


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Ethiopia, among many other African countries, experienced extreme drought and famine in 2016. (European Comission DG Echo/flickr)

 Jenna Ladd | January 19, 2017

Yet another record was set on Wednesday when the National Oceanic and Atmospheric Association (NOAA) released its annual Climate Report.

The report announced that 2016 was the hottest year on record for the third consecutive year. Deke Arndt is the chief of the monitoring group at NOAA’s National Centers for Environmental Information in Asheville, N.C.

Arndt said, “[Last year] was the warmest year on record, beating 2015 by a few hundredths of a degree, and together those two years really blow away the rest of our record.” He continued, “And that doesn’t sound like a lot, but when you take that and you average it all the way around the planet, that’s a big number.”

Rising temperatures were not limited to certain regions. Experts said that some part of every major ocean and every major continent experienced record heat. The Arctic, however, saw some of the most extreme warming. During Fall of 2016, temperatures were a full 20 to 30 degrees Fahrenheit warmer than average across large parts of the Arctic ocean.

Scientists say the long-term warming caused by climate change was intensified by the El Niño weather phenomenon during 2015 and 2016. Their combined effect caused drought and famine in Zambia, Congo, Zimbabwe, Mozambique and Malawi, among other countries. Now that El Niño is coming to an end, Arndt said that the annual temperature-recording breaking probably will too, but an overall warming trend will continue.

Arndt said, “The long-term warming is driven almost entirely by greenhouse gases. We’ve seen a warming trend related to greenhouse gases for four, five, six decades now.”

The Climate Report, along with a separate analysis by NASA which duplicated its results, were released on the same day that confirmation hearings began for Oklahoma Attorney General Scott Pruitt, who has been nominated by President-elect Trump to lead the Environmental Protection Agency. Pruitt, who staunchly supports the fossil fuel industry, is identified as “a leading advocate against the EPA’s activist agenda” in his official biography.

The complete report and a summary of its findings can be found here.

Iowa sees the “humidity effect” this week


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Photo by Pentax_clic; Flickr

This week’s climate in some Iowa cities has been notably warm. However, the warmer than usual climate is not due to abnormally high temperatures, but rather high humidity levels.

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Photo by Iowa State University Department of Agronomy

The chart above shows the difference between temperature and heat index at an 80 or above degree level. Continue reading

High temperatures force early dismissals at Iowa schools


Photo by woodleywonderworks, Flickr.

This year’s unusually warm summer continues to affect Iowans.

Schools around the state have been forced to dismiss students early during some of the hotter days. On Thursday, 50 Iowa schools ended early.

As long as the school day last for 5.5 hours, schools do not have to make up for the lost class time. However, with the frequency that some schools have had early dismissal this month, students will lose substantial schooling if no school days are added.

Read more from The Gazette here.

Iowa temps reach record highs


This map, from the Iowa Environmental Mesonet, shows the departure from the previous record temperature.

Iowans experienced an unprecidented level of warmth across the state yesterday, with many areas breaking previous record high temperatures by more than 10 degrees.

According to Kevin Deitsh, a meteorologist at the National Weather Service in Des Moines, the cause of the warmth is linked to what meteorologists call “Downslope Warming,” where air masses are warmed as they descend from the front range of the Rocky Mountains.

“Enjoy it – that’s my advice,” said Deitsch. “Get out while you can.”

Though January is typically Iowa’s coldest month, the National Weather Service predicts this unusual warm weather will continue for the next few days.

For more information, check out the full article here.