Tag: Centers for Disease Control

A post on Heat

Not the first and I’m sure it won’t be the last on this topic!

We are experiencing the first week of Summer’s heat.

Where it is going, temperature-wise, who knows but the consensus is that it is becoming warmer year on year.

So this seemed like a great post to republish. It was on The Conversation.

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Heat index warnings can save lives on dangerously hot days − if people understand what they mean

The sticky combination of heat and high humidity can be more than uncomfortable – it can be deadly. Mario Tama/Getty Images

Micki Olson, University at Albany, State University of New York

You’ve probably heard people say, “It’s not the heat, it’s the humidity.” There’s a lot of truth to that phrase, and it’s important to understand it as summer temperatures rise.

Humidity doesn’t just make you feel sticky and uncomfortable – it also creates extra dangerous conditions on hot days. Together, too much heat and humidity can make you sick. And in severe cases, it can cause your body to shut down.

Meteorologists talk about the risk of heat and humidity using the heat index, but it can be confusing.

I’m a risk communication researcher. Here’s what you need to know about the heat index and some better ways meteorologists can talk about the risks of extreme heat.

A construction worker in reflective gear holds a jacket over his head against the sun.
Outdoor workers can be at high risk of heat illnesses. Robert Gauthier/Los Angeles Times via Getty Images

What is the heat index, and how is it measured?

Heat index is the combination of the actual air temperature and relative humidity:

  • Air temperature is how hot or cold the air is, which depends on factors such as the time of day, season of the year and local weather conditions. It is what your thermometer reads in degrees Celsius or Fahrenheit.
  • Relative humidity compares how much water vapor is in the air with how much water vapor the air could hold at that temperature. It’s expressed as a percentage.

The heat index tells you what it “feels like” outside when you factor in the humidity. For example, if it’s 98 degrees Fahrenheit (36.7 Celsius) with 55% relative humidity, it might feel more like a scorching 117 F (47.2 C).

A chart with a grid showing heat and humidity risks.
NOAA’s heat index chart shows how heat and humidity combine for dangerous temperatures. NOAA

But there’s a catch: Heat index is measured in shady conditions to prevent the sun’s angle from affecting its calculation. This means if you’re in direct sunlight, it will feel even hotter.

Apparent temperature, alerts and wet bulb

“Apparent temperature” is another term you might hear this summer.

Apparent temperature is the “feels like” temperature. It considers not only temperature and humidity but also wind speed. This means it can tell us both the heat index and wind chill – or the combination of the temperature and wind speed. When conditions are humid, it feels hotter, and when it’s windy, it feels colder.

We found that apparent temperature is even less well understood than the heat index, possibly due to the word apparent having various interpretations.

There are a few other ways you may hear meteorologists talk about heat.

Wet bulb globe temperature considers temperature, humidity, wind and sunlight. It’s especially useful for those who spend time outdoors, such as workers and athletes, because it reflects conditions in direct sunlight.

HeatRisk is a new tool developed by the National Weather Service that uses colors and numbers to indicate heat risks for various groups. More research is needed, however, to know whether this type of information helps people make decisions.

In many places, the National Weather Service also issues alerts such as excessive heat watches, warnings and advisories.

The risk is getting lost in translation

Knowing about heat and humidity is important, but my colleagues and I have found that the term heat index is not well understood.

We recently conducted 16 focus groups across the United States, including areas with dry heat, like Phoenix, and more humid areas, like Houston. Many of the people involved didn’t know what the heat index was. Some confused it with the actual air temperature. Most also didn’t understand what the alerts meant, how serious they were or when they should protect themselves.

In our discussions with these groups, we found that meteorologists could get across the risk more clearly if, instead of using terms like heat index, they focus on explaining what it feels like outside and why those conditions are dangerous.

Watches, warnings and advisories could be improved by telling people what temperatures to expect, when and steps they can take to stay safe.

A woman holds a baby at an open window with a fan blowing in.
Clear warnings can help residents understand their risk and protect themselves, which is especially important for small children and older adults, who are at greater risk of heat illness. Jason Armond/Los Angeles Times via Getty Images

Climate change is exacerbating heat risks by making extreme heat more common, intense and long-lasting. This means clear communication is necessary to help people understand their risk and how they can protect themselves.

What you can do to protect yourself

With both hot and humid conditions, extra precautions are necessary to protect your health. When you get hot, you sweat. When sweat evaporates, this helps the body cool down. But humidity prevents the sweat from evaporating. If sweat cannot evaporate, the body has trouble lowering or regulating its temperature.

Although everyone is at risk of health issues in high heat, people over 65, pregnant women, infants and young children can have trouble cooling their bodies down or may run a higher risk of becoming dehydrated. Certain health conditions or medications can also increase a person’s risk of heat-related illness, so it’s important to talk to your doctor about your risk.

Heat illnesses, such as heat exhaustion and heat stroke, are preventable if you take the right steps. The U.S. Centers for Disease Control and Prevention focuses on staying cool, hydrated and informed.

  • Stay cool: Use air conditioning in your home, or spend time in air-conditioned spaces, such as a shopping mall or public library. Limit or reschedule your exercise and other outdoor plans that occur in the middle of the day when it is hottest.
  • Stay hydrated: Drink more water than you might otherwise, even if you don’t feel thirsty, so your body can regulate its temperature by sweating. But avoid sugary drinks, caffeine or drinks with alcohol, because these can cause you to become dehydrated.
  • Stay informed: Know the signs of heat illness and symptoms that can occur, such as dizziness, weakness, thirst, heavy sweating and nausea. Know what to do and when to get help, because heat illnesses can be deadly.
Heat exaustion includes dizziness, thirst, heavy sweating, nausea and weakness. Move to cooler area, loosen clothing, sip cool water and get medical help if no improvement. If heat stroke, including confusion, dizziness and unconsciousness, also call 911.
The difference between heat exhaustion and heat stroke and the CDC’s advice on how to respond. NOAA, CDC

Micki Olson, Senior Researcher in Emergency and Risk Communication, University at Albany, State University of New York

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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That last diagram on staying cool, staying hydrated, and staying informed is one element in me choosing this article for publication. Further, if one looks up the website for the Centers for Disease Control and Prevention then immediately one comes across:

Stay cool indoors.Stay in an air-conditioned place as much as possible. If your home does not have air conditioning, go to the shopping mall or public library—even a few hours spent in air conditioning can help your body stay cooler when you go back into the heat.

Please take care!

Another life-saving dog!

There’s no end to how dogs protect us!

Last Tuesday, I published a guest post that had been sent to me by my sister, Eleanor, who lives in Johannesburg in South Africa.

Then a day later I read on the Care2 site about a therapy dog that alerted a group of schoolchildren to potentially very unsafe drinking water.  I must share that with you as well.

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Therapy Dog Helps Alert School District to Lead in Water

By: Laura Goldman

March 31, 2017   About Laura

Follow Laura at @lauragoldman

A therapy dog belonging to a San Diego elementary school teacher proved to be a potential lifesaver – but not for what you might think.

When the teacher filled his bowl with water from the classroom sink on Jan. 26, the dog refused to drink it. The teacher took a good look at the water in his bowl and noticed a sheen on its surface. Concerned, she notified school officials.

After testing samples from around Emerson-Bandini Elementary and the San Diego Co-Operative Charter School 2, which share a campus, results showed the water was contaminated with lead, exceeding the allowable level in the state of California.

School officials contacted the City of San Diego Public Utilities Department, which supplies the water. Because that therapy dog that refused to drink it, the city is now testing the water at each of the school district’s 187 campuses.

The tests, however, won’t begin until April 4, San Diego Unified Chief Operations Officer Drew Rowlands announced last week. In the meantime, students are getting bottled drinking water.

A notice sent to the schools’ staff and parents said the water is safe for handwashing. Since cafeteria meals aren’t prepared on campus, they’re not affected by the contaminants in the water, according to the notice.

The testing of the water, which is expected to be completed by the end of the school year in June, will take place early in the morning, before school starts. At each campus, up to five samples will be taken from water fountains and cafeterias where food is prepared. The test results will be posted online.

If excessive lead is discovered, the contamination source will be determined and school district staff will take “appropriate action on a case-by-case basis,” said San Diego Unified Chief Operations Officer Drew Rowlands. Those appropriate actions could include replacing plumbing fixtures and making repairs.

Making Drinking Water Safe for Schoolchildren

Coincidentally, just one month before the therapy dog refused to drink the San Diego school’s water, the State Water Resources Control Board (SWRCB) Division of Drinking Water launched a program that requires water providers to test for lead in the drinking water at all K-12 schools in California.

“Recent events in the United States have shown that lead in drinking water remains an ongoing public health concern, particularly for children,” the SWRCB stated on its website.

How does lead end up in school water fountains? Although lead rarely occurs naturally in California’s drinking water sources, it can contaminate water that flows through old plumbing fixtures or the solder connecting them. It’s less likely that the water came from a contaminated source, as was the case in Flint, Mich.

Children younger than six are especially susceptible to the effects of lead poisoning. According to the Centers for Disease Control (CDC), about half a million children between the ages of one and five have blood lead levels above 5 micrograms per deciliter, the level at which the CDC recommends the initiation of public health actions – although no “safe” blood lead level in children has been identified.

A problem with lead poisoning is that there are no obvious symptoms. By the time children show the signs, such as weight loss, irritability and lack of appetite, dangerous amounts of lead may have accumulated in their bodies.

This is a compelling reason for more states to follow California’s lead and require water to be tested in schools. Thanks to a teacher’s therapy dog, students at two San Diego schools got a jump start on having safer water available.

Photo credit: Irisdepiris

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 There is no end to the way that dogs love us, protect us and make us better persons!