Weather Glossary - Y

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Year

The interval required for the earth to complete one revolution around the sun. A sidereal year, which is the time it takes for the earth to make one absolute revolution around the sun, is 365 days, 6 hours, 9 minutes and 9.5 seconds. The calendar year begins at 12 o'clock midnight local time on the night of December 31st-January 1st. Currently, the Gregorian calendar of 365 days is used, with 366 days every four years, a leap year. The tropical year, also called the mean solar year, is dependent on the seasons. It is the interval between two consecutive returns of the sun to the vernal equinox. In 1900, that took 365 days, 5 hours, 48 minutes, and 46 seconds, and it is decreasing at the rate of 0.53 second per century. This decrease is due to the slow precession of the Earth's axis of rotation.

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Tropical Cyclone Seroja update

13:39 EST

Tropical Cyclone Seroja is tracking in a south-southeast direction and is expected to make landfall just north of Geraldton later this evening or early on Monday morning.

Powerful south-westerly ground swell impacts Tasmania

13:39 EST

Very large, long period waves are making for treacherous conditions along the western and northern coastlines of Tasmania.  A series of cold fronts, which have brought gusty winds and cold conditions to much of the southeast, generated these large waves over the last week. Intense south to south-westerly winds over the Southern Ocean directed towards Australia with these fronts built this powerful swell event with passage of each frontal system across an already active sea state.  On Tasmania’s western coast, the Cape Sorell directional wave buoy captured some very large waves bringing dangerous surf.

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