Image courtesy (©) Wanda Fung / KTSF.Now that we are in the middle of the dawg daze of yet another long hot Texas Summer, I decided to share a formula that I’ve developed and honed over time to quantify just how hot it actually “feels” when attempting to do any type of physical activity outside. The weather service uses a “heat index” figure that seems to be fairly accurate from a pure temperature standpoint when simply sitting outside in the shade, but I find from experience that it falls woefully short in consistently measuring the conditions one experiences when actually working out. The modern “heat index”, in my opinion, overweights the temperature by being too low for conditions when the temperatures are lower and humidities higher. Back in my childhood I often spent good portions of my summers at my grandparent’s house in East Texas where we got the daily weather forecasts from TV stations in Houston. I vaguely recall that the one my grandparents listened to referred to a “misery index” that, if memory serves me correctly, was calculated by combining the temperature (Fahrenheit) and either the relative humidity or the dew-point to produce a number that, if it exceeded 150, indicated that outdoor conditions were absolutely “miserable”. I tried both these formulai over a period of time myself and found them to be pretty good, but still not always consistent. Through a bit of trial and error over several summers and workouts with a variety of temperatures and humidities, I’ve pretty much settled on the following: “Misery Index” = (temperature°F + ((dew-point°F * 2) + humidity) / 3) – (windspeed-mph * (1 – (%humidity / 100))); This takes a weighted (2-1) average of the dew-point and relative humidity combined with the temperature and fudges a bit for wind. The optional wind factor includes the fact that the wind’s ability to cool the body is adversely impacted by the relative humidity; and at 100%, has little if any impact. If there is zero humidity, then I estimate that each mile per hour has around a full degree’s worth of cooling impact. I’ve also found it necessary to factor in both the dew-point and the humidity. The 2-1 weighting given to the dew-point was reached via much trial and error. For example, consider three different Summertime scenarios, all typical around here (Texas): 1) a 90° day with a dew-point of 70°; 2) a 102° degree day with a dew-point of 60°; and 3) a “low for the day” morning 80° temperature with a dew point of 73°. The 90° day thus yields a calculated relative humidity of 52% and the 102° day 25%, and the 80° morning 79%. Using our weighted formula (and assuming no wind for the moment), the 90° day yields a “misery index” of 154, whereas the 102° day yields 148, and in the morning it’s 155! I can assure you that both the 90° day and the 80° morning in our example are indeed noticeably more “miserable” to work out in than the 102° day, but the 102° day is getting pretty close!). It should also be noted that the level of “misery” was nearly just as bad before sunrise as at the mid-day temperature of 90° (so much for better workout conditions in the early morning – I’ve tried early morning workouts and found it to be true that the humidity cancels out the lower temperature)! Now, had we used just the temperature + humidity, these three Summer days would’ve yielded indices of 142, 126, and 159 respectively with neither the two mid-day readings registering as high on the scale as I feel they should and the hotter, dryer day being rated too much less miserable relative to the other than it actually is in experience. The morning value of 159 is way higher than the others (not right). Using just temperature + dew-point would yield 160, 162 and 153 respectively, which also miss the mark with the hotter day being rated slightly more “miserable”. This is the reason for incorporating both values (dew-point and relative humidity) into our formula. Now, factor in a typical 8 mph breeze to both mid-day readings (we’ll assume no wind for the morning value, which is typical) and you get a four point reduction on the 90° day and a six point reduction on the 102° day as the wind will likely feel about 50% cooler on the dryer day! You can also multiply the final value by 2/3 (0.67) if you wish to have a number that’s closer to a Fahrenheit temperature sale value if you are more comfortable with that. This would produce values of (90° day: 103, 102° day: 99, and the 80° day: 103) respectively. I’ve been a distance runner and believe that this formula most accurately predicts how “miserable” my workout will be and I usually find it difficult to accomplish much when the index exceeds 150 regardless of the temperature or “heat index”. Generally below 140 and it’s not too bad for a decent workout. I consider 160 and over un-doable due to a high risk of heat-exhaustion! In fact, I’ve written my own “weather app” that runs on my computer that will tell me what the “misery index” is at the moment (along with the temperature and other weather conditions) allowing me to plan outdoor activity accordingly! This, however should not be taken as advise for anyone else in considering their own physical safety when working outdoors and you should know your own body’s limitations and consulting your physician before undertaking physical activity in hot weather!
|I heard on WBAP Radio that there’s a new “Aggie Cologne” being marketed now that’s supposed to capture the true Aggie smell! I’m guessing it’s made from a combination of water from the floors of the Corps dorm showers, Johnny Football’s used gym socks, some secret ingredient from the Heldenfeld’s chemistry labs, used grease from Sbisa Dining Hall, and the used hay from Parson’s Mounted Cavalry’s barns!
I also hear it’s expensive, but, after sampling some myself, I figure anyone can get the same “essence” much cheaper by simply not showering or brushing one’s teeth for a couple of weeks. LOL! Quote of the Day: “The claims that progressives make on the fruits of the labors of others will always be opposed by me because no one has a right to that which belongs to another.” – me Current Investment Take: I believe we are going through a market correction and that both stock and particularly, bond investments have overreacted. I’m looking to add to positions later this week or next week.
Bells Are Ringing
by Mark Tooley, (©) The American Spectator, June 27 2013.
“Despite all the bell ringing at liberal and mostly empty churches (emphasis mine), the fight over same-sex marriage is no more over than has been the 40-year fight over abortion since the Supreme Court’s first ruling. Traditional churches will continue to contend for the faith and for a nation. They instinctively understand with Cardinal Dolan that the “common good of all, especially our children, depends upon a society that strives to uphold the truth of marriage.” Going Galt: Why men are boycotting marriage, fatherhood and the American Dream
by Matt K. Lewis, (©) Daily Caller, June 21, 2013. GOP staffer declares victory over food stamp challenge: “Nothing tastes better than debunking liberalism”
by Caroline May, (©) Daily Caller, June 23, 2013. 5 Foods That Kill Cancer
by Dave Mihalovic, Why Don’t You Try This, Feb. 12, 2013. Big Brother Alert: Big Brother alert: Cameras in the cable box to monitor TV viewers
by Cheryl K. Chumley, (©) The Washington Times, June 17, 2013.
me:This was actually in the George Orwell’s book “1984″. Yet another reason to eschew “Toll TV” (cable, satellite, etc.) “Free (Over-The-Air) TV” is bad enough, so why pay for more? lol)
|Cops behaving badly: “Warrant? You Don’t Need To See No Stinkin’ Warrant. Cuff Her!”
by Ben Bullard, (©) Personal Liberty, June 18, 2013.
me:This woman did the right thing, only other thing I would’ve done is remind them that they did NOT come out here to arrest ME & what “crime” they had just observed me committing on my own property and what was I being charged with. Then I would have told them that “I am putting YOU on notice, sir, that I will sue YOU PERSONALLY for false arrest and imprisonment!” Then, AFTER I was taken to jail and my son left, also added “child endangerment” to the suit (for leaving my child unattended). Cops behaving badly II: LeDuff: Detroit police’s simulated purse snatching goes awry
by Charlie LeDuff, (©) Fox 2 News, June 6, 2013.
me:This is so full of stupid in so many wayz. Marco Rubio: In immigration reform, legalization comes first – “It is not conditional”
by Byron York, (©) Washington Examiner, June 10, 2013.
me:Another progressive shows his true identity. House Speaker John Boehner: NSA Leaker a “Traitor”
by Abby D. Phillip, (©) ABC News, June 11, 2013
me:And, another progressive shows his true identity. Before Adblock Plus
by Derringer Dick, (©) Creative Challenge, June, 2013.
me:Interesting, I use Adblock Plus! Can’t imagine surfing without it! ‘Obamacare’ alternative: health-sharing ministries offer a way out
by Tom Howell Jr., (©) The Washington Times, June 6, 2013. No Need to Panic About Global Warming
by Claude Allegre, (©) The Wall Street Journal, undated. Barnstorming for Jobs and Growth – Rick Perry promotes the Texas Miracle.
by Fred Barnes, (©) Weekly Standard, Jun 3, 2013.
me:I’m proud of our Governor, Rick Perry, he is one of the few people out there truly articulating well the very valid case for Conservatism! Arthur Laffer: “An economy can’t be taxed into prosperity”
by Authur Laffer, (©) The Globe And Mail, May 29 2013. Canada’s Single-Prayer Health Care
“Infant mortality rates are often cited as a reason [for] socialized medicine…in the U.S., low birth-weight babies are still babies. In Canada, Germany and Austria, a premature baby weighing less than 500 grams is not considered a living child and is not counted in such statistics…”
by (©) Investors, June 30, 2009.
The “Misery Index” – Calculating how “miserable” your Summer workout will be
This entry was written by wildstar84, posted on June 30, 2013 at 10:59 pm, filed under technical and tagged heat index, Misery Index, Misery Index Formula, outdoor workouts, Summer heat, weather. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.