Archive for the ‘Nova Scotia storm’ Tag

LATEST ON GASTON – 9-3-2010

Gaston has weakened to the point where it has lost its closed rotation.  This means it has returned to the status of tropical wave (synonymous with tropical disturbance).  However, some of the more dependable computer models expect it to regain strength soon.  My advice is to ignore the CLP5 track in the chart above; it is a baseline derived from recent directional tendencies and is used as a tool “after the fact” to evaluate the accuracy of the more analytical models.

You have probably noticed that I tend to focus on those storms which could be a threat to Florida and the Gulf Coast and once that threat passes I generally assume that you get plenty of continuous information from television news.  Though it is quite repetitive and there is some “drama” I still highly recommend the Weather Channel.  Here is a link to their Hurricane Central page:  http://www.weather.com/newscenter/hurricanecentral/

We have friends in our West-Central Florida neighborhood, wonderful people, who are currently in Nova Scotia.  Therefore, since some of my concerned neighbors consult this site, I’m including this current statement about Earl’s expected effect upon Canada.  This comes verbatim from the WeatherUnderground website, appearing in Dr. Jeff Masters’ web-log (11:54 am EDT):

Impact of Earl on Canada

“Winds will begin to rise on the southwest coast of Nova Scotia late Friday night and early Saturday morning. By late morning Saturday, Earl is expected to make landfall somewhere between the Maine/New Brunswick border and central Nova Scotia. At that time, Earl will probably be a strong tropical storm with 55 – 60 mph winds. Earl will be moving at a very rapid 25 – 30 mph when it arrives in Canada, and regions on the right side of the eye can expect winds 15 – 20 mph greater than on the left side, due to the fast forward motion of the hurricane. Earl’s impact is likely to be less than 2008’s Hurricane Kyle, the last hurricane to hit Nova Scotia. Kyle hit near Yarmouth, Nova Scotia, as a Category 1 hurricane with 75 mph winds. Kyle produced a storm surge of 2.6 feet, and did $9 million in damage to Canada. The 11am EDT NHC wind probability forecast is calling for a 15% chance of hurricane-force winds in Yarmouth, and 3% in Halifax.”

Hurricane Kyle Is Heading Northward Toward Maine and Nova Scotia

Source = National Hurricane Center

Source = National Hurricane Center

Left click to enlarge this image.

At 8 PM EDT this evening Kyle still was maintaining hurricane strength in spite of high wind shear aloft.  Generally, a 15 mph wind shear is about the break-off point for being slow enough to allow a hurricane to hold its strength or intensify.  It has been greater than that today and is expected to get up to 25 mph tomorrow.  However, the winds over the storm are diverging as two cars going down the highway together would diverge a bit if one of them were to move to a lane further from the other car.  So, the air over the storm is moving in the same general direction but spreading a bit.  When air aloft converges it tends to sink and the opposite happens when air aloft diverges; there tends to be an increase in the amount of air rising from below.  This could allow Kyle to maintain hurricane strength tomorrow in spite of the shear.  It’s a fine balance and there is some disagreement as to whether it will still be a hurricane tomorrow since at 8 PM the maximum sustained winds were 75 mph and 73 mph would demote it a tropical storm.

It will be interesting to see what happens.  Of course, for the sake of the landfall regions and the ships and boats at sea in that area, I hope it weakens quickly.