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Monthly Archives: July 2020
What is the heat index?
The heat index indicates how hot it feels. It is expressed as a function of air temperature and the relative humidity.
The heat index temperature is for standing in the shade and light winds; when exposed to direct sunlight, the heat index value can be increased by up to 15 degrees F. Continue reading
Winter in July?
On more than one occasion in this column we have commented on the areal extent of air colder than 23 degrees about 1 mile above the ground as a measure of the extremity of winter.
In the middle of January, about 68 million square kilometers of the Northern Hemisphere are covered by air that cold at that level. Between about July 5 and July 20 that area shrinks to zero, and the complete absence of such air lasts only a very few days. Continue reading
What is the heat index?
The heat index indicates how hot it feels.
It is expressed as a function of air temperature and the relative humidity. The heat index temperature is for standing in the shade and light winds; when exposed to direct sunlight, the heat index value can be increased by up to 15 degrees. Continue reading
What is mud rain?
Mud rain is rain that contains a noticeable concentration of particles of sand or dust. The soil can be of local origin or it can originate from very distant regions. As rain falls through the dust layer, the raindrops collect … Continue reading
