Category Archives: Meteorology

When does the Overnight Low Temperature Occur on a Windless Day?

As the summer begins to fade we have begun to have the first cool nights of the season. When the sky is clear, the winds are calm, and the ground is dry as the sun sets, the conditions are perfect for an interesting phenomena to occur the next morning . . . Continue reading

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Is High Pressure Always Warm Air?

High pressure systems can be cold or warm, humid or dry. The origin of a high-pressure region determines its weather characteristics.

If a high-pressure system moves into Wisconsin from the south during the summer . . . Continue reading

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How is the Dew Point Measured?

A dew point hygrometer consists of a small mirror, a narrow light beam and a light detector. The light beam is reflected off the mirror into the detector, which measures the brightness of the reflected light . . . Continue reading

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What is the Heat Index?

The heat index, or apparent temperature index, indicates how hot it feels. It is expressed as a function of air temperature and the relative humidity. . . Continue reading

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What is with the Humidity?

As the spring finally comes after a cool second half of April, it is not only the temperature that rises but also the humidity. Humidity is a measure of the amount of invisible water vapor that is in the air. Continue reading

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