![]() ![]() A uniform set of equivalents was accepted in 1926, and revised slightly in 1946. In 1912 the International Commission for Weather Telegraphy sought some agreement on velocity equivalents for the Beaufort scale. Beaufort's original specification is essentially an association of a set of values (0 to 12) with a description of the state and behavior of a "well-conditioned man-of-war." In examining Beaufort's original scale, it is a force scale with no mention of wind speed. It was at this time that he devised his wind force scale. In the summer of 1805 Commander Beaufort was appointed to the command of the Woolwich, a 44 cannon man-of-war. Beaufort had an illustrious career on the seas and by 1800 had risen to the rank of Commander. He entered the Royal Navy at the age of 13 as a midshipman aboard the Aquilon. Rear-Admiral, Sir Francis Beaufort, Knight Commander of the Bath, was born in Ireland in 1774. Seldom experienced on land, trees broken or uprooted, "considerable structural damage"Įxceptionally high (30-45 ft) waves, foam patches cover sea, visibility more reducedĪir filled with foam, waves over 45 ft, sea completely white with driving spray, visibility greatly reduced Very high waves (20-30 ft) with overhanging crests, sea white with densely blown foam, heavy rolling, lowered visibility Slight structural damage occurs, slate blows off roofs High waves (20 ft), sea begins to roll, dense streaks of foam, spray may reduce visibility Whole trees in motion, resistance felt walking against wind Moderately high (13-20 ft) waves of greater length, edges of crests begin to break into spindrift, foam blown in streaks Whole trees moving, resistance felt walking against wind Sea heaps up, waves 13-20 ft, white foam streaks off breakers ![]() Larger tree branches moving, whistling in wires Larger waves 8-13 ft, whitecaps common, more spray Moderate waves 4-8 ft taking longer form, many whitecaps, some spray becoming longer, numerous whitecapsĭust, leaves, and loose paper lifted, small tree branches move Leaves and small twigs constantly moving, light flags extended Large wavelets, crests begin to break, scattered whitecaps Wind felt on face, leaves rustle, vanes begin to move Small wavelets, crests glassy, no breaking The report also rated a third of the soil moisture in the area as excessive.Smoke drift indicates wind direction, still wind vanes Overall crop conditions in Edmonton area, stretching from Drayton Valley to Athabasca, are down by 11 per cent this year compared to the five-year average, according to Alberta crop report released Friday.Ībout 55 per cent of the area's crops are rated good and excellent this year, compared to an average 66 percent. Making hay while the sun doesn't shine: Alberta weather takes toll on farmers."It has been a tough couple of rough seasons," Bohn said. Last month was the wettest July since 1982 in Edmonton, with about 160 millimetres falling on the city - or nearly double the 30-year average. He says the rain has stopped him from getting a second cut of hay this year "Last night is really going to hurt a lot of people, farmers, because literally just knocked everything down," said Roy Bohn, a farmer in Spruce Grove.īohn says the hailstorm missed his farm, but his hay crop was hit with rain showers. The number of hail storms and the size of the stones are expected to increase in parts of west-central Alberta as the atmosphere warms due to climate change, a 2017 study published in the Nature Research journal forecasts. He said a supercell storm has strong and persistent updrafts that keep the hail circulating in the upper level of the storm, where it can grow to sizes seen on Friday. Supercell thunderstorms from north of Drayton Valley towards Spruce Grove are responsible for the size of the hail, Environment Canada meteorologist Blaine Lowry said. "That's what took the windshield out, I think: the wind behind the boulders." "It was coming down pretty hard and quite a bit of wind with it," he said. #ABStorm #sprucegrove /iI1oiHAdOT- Huber has lived in Spruce Grove for nearly seven decades, but the hailstones that fell from the sky Friday night -putting multiple cracks in his windshield - are the biggest he's ever seen. Tons of siding damage from these golf ball sized hail. ![]()
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