Fri Jun 17, 2022, 10:12 PM
OhNo-Really (3,930 posts)
How Heat Killed 2k Cows Today - Wet Bulb Conditions
Crib Note: If humidity & temperature are both above 80, double check for Wet Bulb warnings. Chart at first citation below. And why cows died today en masse. End
Quotes from articles &!links: “With further progression of global warming, areas in more moderate climates including Southern Europe and the US will also experience more and more days with “red” or “black” conditions. Wet Bulb Globe Temperature (WBGT) If the combination of temperature and relative humidity reaches a certain level, the body can no longer cool down sufficiently through sweating. Especially when physically active, the body creates a lot of excess heat that can very quickly lead to heat stroke and death in bad WBGT conditions. The following charts* show the danger of physical activity at different combinations of temperature and humidity. See charts at link. https://climate-preparedness.com/understanding-wet-bulb-temperature-and-why-it-is-so-dangerous/ 2000 Kansas cows died this week from Wet Bulb Globe Temperature (WBGT) “Heat, humidity kill at least 2,000 Kansas cattle, state says” https://www.cnbc.com/2022/06/15/heat-humidity-kill-at-least-2000-kansas-cattle-state-says.html If your that person who pushes through outdoor chores or a round of golf no matter, I hope you check out the WBGT. Or check in to make sure immobile neighbors are ok. It’s summertime.
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13 replies, 1779 views
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Author | Time | Post |
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OhNo-Really | Jun 2022 | OP |
ornotna | Jun 2022 | #1 | |
OhNo-Really | Jun 2022 | #2 | |
maxrandb | Jun 2022 | #3 | |
Takket | Jun 2022 | #6 | |
NickB79 | Jun 2022 | #4 | |
OhNo-Really | Jun 2022 | #7 | |
Kaleva | Jun 2022 | #8 | |
Polybius | Jun 2022 | #9 | |
Kaleva | Jun 2022 | #10 | |
Kaleva | Jun 2022 | #11 | |
keithbvadu2 | Jun 2022 | #5 | |
Novara | Jun 2022 | #12 | |
Delphinus | Jun 2022 | #13 |
Response to OhNo-Really (Original post)
Fri Jun 17, 2022, 10:22 PM
ornotna (10,491 posts)
1. Big deal here in Florida
High heat and high humidity, it sucks.
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Response to ornotna (Reply #1)
Fri Jun 17, 2022, 10:25 PM
OhNo-Really (3,930 posts)
2. I never heard of Wet Bulb
But jogged a lot when visiting Florida in August one year. Oops.
I’m guessing lots of people are unaware of WBGT And I’m sorry. Beautiful place but 😢 |
Response to OhNo-Really (Reply #2)
Fri Jun 17, 2022, 10:58 PM
maxrandb (14,014 posts)
3. The good old WGBT
Corpsman used these in the Navy. Worst I ever saw was off the coast of Namibia where the safe stay time in the Fire Room was 12 minutes.
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Response to OhNo-Really (Reply #2)
Sat Jun 18, 2022, 12:01 AM
Takket (19,340 posts)
6. "wet bulb" is basically another way to talk about humidity
I think most people are essentially aware that "discomfort" increases as temperature AND humidity increase. The closer the wet bulb temperature is to the dry bulb (dry bulb being what you'll read if you stick a plain old thermometer in the air), the wetter the air is. If the wet and dry bulb temperature are the same, the air is saturated (100% humidity). The hotter air is, the more water vapor (humidity) it can hold, and as humidity increases, so does wet bulb temp.
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Response to OhNo-Really (Original post)
Fri Jun 17, 2022, 11:10 PM
NickB79 (18,041 posts)
4. Now imagine this hitting a major population center
Say, in India or Pakistan.
Hundreds of thousands would die in a matter of days. It's going to happen, too. At 400+ ppm of CO2 and rising, it's inevitable. |
Response to NickB79 (Reply #4)
Sun Jun 19, 2022, 02:53 AM
OhNo-Really (3,930 posts)
7. I think it it already has
Response to NickB79 (Reply #4)
Sun Jun 19, 2022, 06:10 AM
Kaleva (34,696 posts)
8. It's going to happen in parts of the US in the near future
Response to NickB79 (Reply #4)
Sun Jun 19, 2022, 07:40 AM
Polybius (12,743 posts)
9. 80+ degrees and 80+ humidity?
That hits NYC all the time every Summer.
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Response to Polybius (Reply #9)
Sun Jun 19, 2022, 08:46 AM
Kaleva (34,696 posts)
10. Here's a link to a chart that will help you
Response to Polybius (Reply #9)
Mon Jun 20, 2022, 06:30 AM
Kaleva (34,696 posts)
11. Another useful link
https://www.weather.gov/ama/heatindex
't surprises many people to learn that the heat index values in the chart above are for shady locations. If you are exposed to direct sunlight, the heat index value can be increased by up to 15°F. As shown in the table below, heat indices meeting or exceeding 103°F can lead to dangerous heat disorders with prolonged exposure and/or physical activity in the heat.' |
Response to OhNo-Really (Original post)
Fri Jun 17, 2022, 11:29 PM
keithbvadu2 (31,884 posts)
5. Some Irony: Most Likely Early Sites for Fatal Wet Bulb Extreme Temperatures are in the Persian Gulf.
https://democraticunderground.com/1127152947
Some Irony: Most Likely Early Sites for Fatal Wet Bulb Extreme Temperatures are in the Persian Gulf. Several charts and WBGT examples. |
Response to OhNo-Really (Original post)
Mon Jun 20, 2022, 06:53 AM
Novara (4,781 posts)
12. And if you don't know what wet bulb is, check the dew point
Here's a handy site.
A good easy rule of thumb is that if the dew point is near the air temperature, it is damn humid and uncomfortable. And any dew points over 60 degrees F are uncomfortable. When the humidity is high, sweat doesn't evaporate and it doesn't cool you down. |
Response to Novara (Reply #12)
Mon Jun 20, 2022, 08:10 AM
Delphinus (10,900 posts)
13. Thank you
I've been trying to learn about wet bulb and this information, along with what is in the thread, will help.
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