Hot, Heat index defined
Good morning Augusta.
This morning it is partly cloudy with a chance of a thunderstorm and a
chance of rain. High of 82F. Winds from the SSW at 5 to 15 mph. Chance of
rain 40%.
Tonight it will be overcast with a chance of a thunderstorm and a chance of
rain, then a chance of rain after midnight. Low of 63F. Winds from the SSW
at 5 to 15 mph. Chance of rain 50%.
The readings from my instruments out in the hay field are:
The humidity is 73% with a Dew Point of 71.4ºF and a wind chill of 81.0ºF.
The temperature is 80.1ºF.
We have South Southwest winds between 2.5 mph and 5.4 mph.
Our Barometric pressure is 29.72/HPA 1006.4 and falling with a weather
graphic indicating rain.
The UV rating is 1 out of 16, sunset will be at 8:17 PM with Moon Rise at
1:34 a.m. and the moon phase is waning crescent.
For the pilots out there, Raw Metar readings are:
METAR KAUG 021053Z AUTO 20004KT 8SM CLR 21/19 A2980 RMK AO2 SLP090 T02060189
Visibility is 8.0 miles/12.9 kilometers with a clear ceiling.
We had no precipitation here in the past 24 hours.
Ever wonder what the "Heat Index" really means?
I hope this explanation helps.
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.
In Canada, the similar "humidex" is used in place of the heat index. The
humidex is not described here.
This morning it is partly cloudy with a chance of a thunderstorm and a
chance of rain. High of 82F. Winds from the SSW at 5 to 15 mph. Chance of
rain 40%.
Tonight it will be overcast with a chance of a thunderstorm and a chance of
rain, then a chance of rain after midnight. Low of 63F. Winds from the SSW
at 5 to 15 mph. Chance of rain 50%.
The readings from my instruments out in the hay field are:
The humidity is 73% with a Dew Point of 71.4ºF and a wind chill of 81.0ºF.
The temperature is 80.1ºF.
We have South Southwest winds between 2.5 mph and 5.4 mph.
Our Barometric pressure is 29.72/HPA 1006.4 and falling with a weather
graphic indicating rain.
The UV rating is 1 out of 16, sunset will be at 8:17 PM with Moon Rise at
1:34 a.m. and the moon phase is waning crescent.
For the pilots out there, Raw Metar readings are:
METAR KAUG 021053Z AUTO 20004KT 8SM CLR 21/19 A2980 RMK AO2 SLP090 T02060189
Visibility is 8.0 miles/12.9 kilometers with a clear ceiling.
We had no precipitation here in the past 24 hours.
Ever wonder what the "Heat Index" really means?
I hope this explanation helps.
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.
In Canada, the similar "humidex" is used in place of the heat index. The
humidex is not described here.
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