Monthly Archives: October 2018

How accurate was the forecast for Hurricane Michael?

Five days in advance of Hurricane Michael’s landfall, the National Hurricane Center forecast showed the storm making landfall near Mexico Beach, Florida, with 80 mph winds, just above Category 1 hurricane force.

As we all know by now, the storm lashed the coast with winds in the 155-mph range, or strong Category 4 intensity. Continue reading

Category: Severe Weather, Tropical, Weather Dangers

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Is the Earth’s spin axis drifting?

The Earth revolves around an imaginary line that passes through the North and South Poles, known as the spin axis. As it spins the Earth drifts and wobbles. And now scientists have identified three reasons.

The Earth wobbles on its axis once every 27,000 years, similar to a spinning top. This alters the relationship between the solstices and the distance from the Earth to the Sun. For example, 11,000 years ago the Northern Hemisphere summer solstice occurred at perihelion, when the Earth is closest to the Sun. That is almost the exact opposite of the case today, Continue reading

Category: Climate, Seasons

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How is the Arctic sea ice doing?

One of several diagnostic signals of a warming climate is the extent of sea ice in the Arctic, particularly its annual minimum extent which often arrives around the autumnal equinox.

The sea-ice extent is directly measured by satellite data and is available through the NASA-supported National Snow and Ice Data Center at the University of Colorado-Boulder. Continue reading

Category: Climate, Seasons

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