The Great Google Machine told me how to figure out the WBGT:

How to find the wet bulb temperature in your area?

Use the formula for wet-bulb temperature: Tw = T × arctan[0.151977 × (RH% + 8.313659)^(1/2)] + arctan(T + RH%) - arctan(RH% - 1.676331) + 0.00391838 ×(RH%)^(3/2) × arctan(0.023101 × RH%) - 4.686035.

Also, here is another good link specific to Kentucky and the KHSAA:

WBGT Activity Guidelines

The Kentucky High School Athletic Association (KHSAA) notes that Wet Bulb Globe Temperature (WBGT) is the gold standard for taking heat measurements; however, it is not mandatory. The following Wet Bulb Globe Temperature guidelines are based on recommendations by the KHSAA:

WBGT readings must be taken at the place of practice/event. Readings must be taken 30 mins prior to the activity.

A scientifically-approved instrument that measures the Wet Bulb Globe Temperature must be utilized. NOTE: Phone apps are not scientifically-approved at this time. All WBGT monitors shall be calibrated, at a minimum, every 2 years or earlier.

The monitoring device must be placed three to four feet above the playing surface, leaving the device exposed to conditions for more than 15 minutes before activities begin.

All readings must be recorded on KHSAA for GE20 and all records must be available upon request.
Water should always be available and athletes be able to take in as much water as they desire.

https://perryweather.com/kentucky-state-weather-policies/

The WBGT is easy to use, and I thought it was required this year for KHSAA, but maybe not until next year. The device can alert you with a flashing screen or audible sound. Our youth organization bought one last year and can be seen setup on the sidelines of any questionable game or practice. 

St. X uses Perry weather and has weather station at St. X and it sends texts to coaches phones. Also get notified when lightning within 10 miles or less.

It is warm out there today, I had to run back into the AC. 

Also, the forecasted high here in NKY (Florence) is 97 on Friday!

11 minutes ago, theguru said:

Also, the forecasted high here in NKY (Florence) is 97 on Friday!

It's a dry heat...

1 minute ago, TheDeuce said:

It's a dry heat...

55% to 70% humidity.

On 8/27/2024 at 1:54 PM, theguru said:

Here is a good link on the Heat Index vs. Wet Bulb Globe Temperature (WBGT).  

Wet Bulb Globe Temperature (WBGT) is similar to the Heat Index in that it is an indicator of the stress on the body from the heat. While it is not as well-known as the Heat Index, it’s not a new term. WBGT was developed in the 1950s after heat related illnesses affected the US armed services during the 1940s. After its implementation, there was a reduction in heat related illnesses during basic training. One fundamental difference between the Heat Index and WBGT is that the latter is calculated with the temperature measured in the sun. While Heat Index only takes temperature and Relative Humidity into account, WBGT takes several variables into account. These variables include:

Temperature
Humidity
Wind Speed
Sun Angle
Cloud Cover
Physical Activity

https://www.dtn.com/forget-heat-index-wet-bulb-globe-temperature-is-where-its-at/

@nWo do you have any thoughts or additional data you can share on the difference between these two measurements?

Wet globe is a much better indicator as it factors in more things that affect how hot it "feels". You'll see less cancellations with it, and it's what the military and most other states have been using to measure heat for many years. I'm glad Kentucky is finally onboard. Now if we can just get them to start practice later like most other states......

1 minute ago, rjs4470 said:

Wet globe is a much better indicator as it factors in more things that affect how hot it "feels". You'll see less cancellations with it, and it's what the military and most other states have been using to measure heat for many years. I'm glad Kentucky is finally onboard. Now if we can just get them to start practice later like most other states......

To me the heat seems like a non-factor to schools now because the way we measure it changed.  

12 minutes ago, theguru said:

To me the heat seems like a non-factor to schools now because the way we measure it changed.  

With the new turf technology utilized, does the playing surface have much of an effect?  I remember when Riverfront Stadium was built they used to talk about August field temps being something like 15 degrees hotter than in the stands

1 minute ago, Oldercoach said:

With the new turf technology utilized, does the playing surface have much of an effect?  I remember when Riverfront Stadium was built they used to talk about August field temps being something like 15 degrees hotter than in the stands

Some of those big stadiums still trap a lot of heat down low if you ask me.

To your question, I have no idea, I am an old man sitting in the AC most of the time.  However, the heat index used to be a "big thing" affecting times and dates and all of the sudden almost nothing changes because we have a new method of determining what is allowable.  It sounds like there is good science behind the wet globe tech and fortunately we almost never need to worry about the heat now.  I guess we were overprotective in the past, I don't know.  Anyone?

2 hours ago, theguru said:

Some of those big stadiums still trap a lot of heat down low if you ask me.

To your question, I have no idea, I am an old man sitting in the AC most of the time.  However, the heat index used to be a "big thing" affecting times and dates and all of the sudden almost nothing changes because we have a new method of determining what is allowable.  It sounds like there is good science behind the wet globe tech and fortunately we almost never need to worry about the heat now.  I guess we were overprotective in the past, I don't know.  Anyone?

I think we were a bit overcautious. I've coached and played high school football in 5 states and Kentucky was the only one that didn't use the Wet Globe Method. Places in the south would never be able to play games or practice if they just used the Heat Index. I think coaches are much better educated on how to deal with heat, and there are many safeguards in place to help prevent and treat issues should they come up. I wouldn't say we don't need to worry about heat now, but I think it's fair to say we are much more knowledgeable in how to deal with it.

5 hours ago, Oldercoach said:

With the new turf technology utilized, does the playing surface have much of an effect?  I remember when Riverfront Stadium was built they used to talk about August field temps being something like 15 degrees hotter than in the stands

Playing surface definitely plays a factor. With the WBGT, you’re supposed to set it up about 3’ off the ground to get the reading so the heat radiating off the surface comes into play. You can have 2 turf fields side-by-side and get different readings due to the infill. The standard rubber is going to be much hotter than some of the newer infills like at Ludlow.

If you want to experience dry heat, travel to Las Vegas during the summer. My wife and I went in late May. It was quite the experience. 

Those along the Ohio River could be in for some heavy rain Friday into Saturday.

This radar simulation is from 5-11 pm EDT.