Stratosphere, definition of

Humidity is a term for the amount of water vapor in the air, and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the Absolute humidity. In everyday usage, it commonly refers to relative humidity, expressed as a percent in weather forecasts and on household humidistat's; it is so called because it measures the current absolute humidity relative to the maximum. Specific humidity is a ratio of the water vapor content of the mixture to the dry air content (on a mass basis). The water vapor content of the mixture can be measured either as mass per volume or as a partial pressure, depending on the usage.

In meteorology, humidity indicates the likelihood of precipitation, dew, or fog. High relative humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. This effect is calculated in a heat index table, used during summer weather.

• Green Christmas, is it possible?
  Christmas and being green don't often go together, we provide advice on reducing your environmental impact to be more Green for Christmas.

• Study claims: Climate Change Increasing the Risk of Space Junk Collisions
  Before you ask, it's not because of all the climate satellites NASA plans to launch in the next few years.
• Carbon emissions are chilling the atmosphere 90km above Antarctica, at the edge of space
  While greenhouse gases are warming Earth’s surface, they’re also causing rapid cooling far above us, at the edge of space. In fact, the upper atmosphere about 90km above Antarctica is cooling at a rate ten times faster than the average warming at...
• Australia Bushfire Smoke Now Warming the Lower Stratosphere?
  From Dr. Roy Spencer’s Blog March 4th, 2020 by Roy W. Spencer, Ph. D. Fig. 1. Bushfire smoke flowing eastward from SE Australia on January 4, 2020 as seen from the International Space Station (NASA). John Christy pointed out to me that our UAH lower...
• Record Antarctic Stratospheric Warming Causes Sept. 2019 Global Temperature Update Confusion
  From Dr. Roy Spencer’s Blog October 4th, 2019 by Roy W. Spencer, Ph. D. While the vast majority of our monthly global temperature updates are pretty routine, September 2019 is proving to be a unique exception. The bottom line is that there is nothing...
• Rare: Sudden Stratospheric Warming in the Southern Hemisphere — cold weather coming?
  Right now a very rare southern SSW (Sudden Stratospheric Warming) is taking place, possibly peaking today or this weekend over Antarctica. In the Northern Hemisphere SSW’s happen more often and in the month afterwards, wild polar blasts like the...
• Evidence of the 11 year Solar Cycle in the Stratosphere
  This is not a novel result, for example: https://wattsupwiththat.com/2018/03/30/tools-to-spot-the-spots/ Nevertheless, this is a solid analysis and exercise in citizen science.~ctm By: Leron Wells During my early teenage years as an avid fan of the Space...
• Chemtrails or Contrails? Another Alarmist Issue Without Scientific Context
  NOTE: like with the essay Saturday about isotasy/glacial rebound being a myth, I don’t think the chemtrails idea has any merit whatsoever. Dr. Tim Ball points out more bad science – chemtrails, which are really just contrails, and which has...
• Evidence that stratospheric circulation changes drive ocean changes, and thus climate changes
  From the University of Utah and the “science is not settled” department comes this interesting bit of research. Stratosphere targets deep sea to shape climate North Atlantic ‘Achilles heel’ lets upper atmosphere affect the abyss...
• Evidence that stratopsheric circulation changes drive ocean changes, and thus climate changes
  From the University of Utah and the “science is not settled” department comes this interesting bit of research. Stratosphere targets deep sea to shape climate North Atlantic ‘Achilles heel’ lets upper atmosphere affect the abyss...
• There might possibly could be a chance of danger! Thunderstorms!
  Guest Post by Willis Eschenbach Thunderstorms are one of my main interests, so I read up on a study by some Harvard researchers that has been receiving all kinds of attention in the blogosphere...