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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 the longest lightning bolt?
The World Meteorological Organization, or WMO, investigates and certifies meteorological records.
On Friday, a WMO committee of experts confirmed a new world record for the longest single lightning flash. The single flash occurred on Oct. 31, 2018 and covered a horizontal distance of 440.6 miles, plus or minus 5 miles, across parts of southern Brazil. Continue reading
Category: Meteorology, Phenomena, Severe Weather
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Does the sunset last longer around the summer solstice?
Yes. The summer solstice — in Latin, “sol,” or “sun,” and “stice,” or “come to a stop” — is the day of the year with the most daylight.
The first day of the astronomical Northern Hemisphere summer is the day of the year when the sun is farthest north. In 2020, this occurred at 4:44 p.m. Saturday. Continue reading
