Warm again
Good Morning
This morning it is clear, then partly cloudy. High of 81F. Winds from the West at 5 to 10 mph. Chance of rain 20%.
Tonight it will be partly cloudy with a chance of a thunderstorm and a chance of rain. Low of 45F. Winds from the NNW at 5 to 10 mph. Chance of rain 20%.
The readings outside right now, taken from my own weather instruments:
a relative humidity of 86% with a Dew Point of 47.9ºF.
The temperature is 52.2ºF with no wind chill.
Presently we have Listless winds between 0.0 mph and 1.3 mph.
Our Barometric pressure is 30.01 and falling with a weather graphic indicating clouds.
We had no precipitation in this area overnight.
Visibility is 10.0 miles with a great ceiling.
Since we are hitting the 80's and it is only March 22, I thought I'd get a jump on summer weather conditions and post the definition of the heat index for you.
Heat indexFrom Wikipedia, the free encyclopedia
The heat index (HI) is an index that combines air temperature and relative humidity in an attempt to determine the human-perceived equivalent temperature — how hot it feels, termed the felt air temperature. The human body normally cools itself by perspiration, or sweating, which evaporates and carries heat away from the body. However, when the relative humidity is high, the evaporation rate is reduced, so heat is removed from the body at a lower rate causing it to retain more heat than it would in dry air. Measurements have been taken based on subjective descriptions of how hot subjects feel for a given temperature and humidity, allowing an index to be made which relates one temperature and humidity combination to another at a higher temperature in drier air.
The heat index was developed in 1978 by George Winterling as the "humiture," and was adopted by the National Weather Service a year later. It is derived from work carried out by Robert G. Steadman. Like the wind chill index, the heat index contains assumptions about the human body mass and height, clothing, amount of physical activity, thickness of blood, sunlight and ultraviolet radiation exposure, and the wind speed. Significant deviations from these will result in heat index values which do not accurately reflect the perceived temperature.
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