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Post by nei on Sept 15, 2018 12:40:53 GMT -5
Looks bad
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Post by nei on Sept 15, 2018 22:53:44 GMT -5
September will also be wet for Massachusetts; wonder if there’ll be any floods. Early September was dry, so everything dried out a bit. Interesting further south gets nothing. Remnants aren’t going up the coast but inland and then curving east thru interior New England
Not sure what the difference between the four images are; I see the same label for all 4
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Post by nei on Sept 15, 2018 23:19:47 GMT -5
Hurricanes were much deadlier when they weren’t well forecast; lots of ships sunk
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Post by nei on Sept 16, 2018 19:43:00 GMT -5
Major highways underwater
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Post by nei on Sept 16, 2018 19:44:27 GMT -5
Didn’t realize Hong Kong was getting affected by a tropical storm
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Post by Giorbanguly on Sept 16, 2018 21:19:51 GMT -5
geezers on CD complaining that the government and the media is blowing a category 1 storm out of proportion. Nevermind that a lot of the damage is caused by storm surges and rainfall, which this weak tiny pathetic category 1 hurricane has provided a lot of
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Post by Deleted on Sept 17, 2018 12:42:37 GMT -5
This is the time of year where we get the remnants of lot of tropical storms. Although much weakened, can they can still pack a punch. Helene is a former hurricane, although it's going to be a fairly mild storm when it hits here.  |
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Post by nei on Sept 17, 2018 13:15:21 GMT -5
This is the time of year where we get the remnants of lot of tropical storms. Although much weakened, can they can still pack a punch. Helene is a former hurricane, although it's going to be a fairly mild storm when it hits here. wonder what British used to think of these storms before it was known they were related to hurricanes — or British even knew of hurricanes. By the time they reach Britain or Ireland, the tropical charecteristics are usually gone and they don't feel that different from North Atlantic gales, just earlier in the season than typical tropical ones? |
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Post by Deleted on Sept 17, 2018 14:11:17 GMT -5
This is the time of year where we get the remnants of lot of tropical storms. Although much weakened, can they can still pack a punch. Helene is a former hurricane, although it's going to be a fairly mild storm when it hits here. wonder what British used to think of these storms before it was known they were related to hurricanes — or British even knew of hurricanes. By the time they reach Britain or Ireland, the tropical charecteristics are usually gone and they don't feel that different from North Atlantic gales, just earlier in the season than typical tropical ones? They do tend to bring heavy rain and above-average temperatures with them, which differs them from regular gales, a few hundred year ago people just saw the as divine punishment from God  en.wikipedia.org/wiki/Great_Storm_of_1703 |
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Post by nei on Sept 17, 2018 18:34:30 GMT -5
Same bridge? Hard to believe
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Post by P London on Sept 19, 2018 8:02:30 GMT -5
The ex hurricanes or "remnants" of hurricanes are essentially Extra-tropical storms though.
Some of those storms can be powerful (for our standards) without it being tropical in origin.
That also confuses me aren't most extra-tropical storms tropical or subtropical in origin?
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Post by alex992 on Sept 19, 2018 13:13:35 GMT -5
The ex hurricanes or "remnants" of hurricanes are essentially Extra-tropical storms though. Some of those storms can be powerful (for our standards) without it being tropical in origin. That also confuses me aren't most extra-tropical storms tropical or subtropical in origin? Yes, tropical in origin, but they lose tropical characteristics once they get too far into the mid-latitudes and cooler water. |
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Post by alex992 on Sept 19, 2018 13:41:21 GMT -5
Yes, tropical in origin, but they lose tropical characteristics once they get too far into the mid-latitudes and cooler water. They still have the tropical characteristics of heavy rainfall and wind though -extra tropical storms here can still drop 500-1000mm, and winds of 150-250km/h Yes, but they lose the main tropical characteristic of having a strong, warm core with a tight "eye", and the strongest rain bands and winds in the center of the storm. When tropical cyclones become "extra tropical" it's because the center becomes weaker and disorganized, which means the wind field "expands" from the center rather than having the strongest portion of the storm near the center. A full-blown tropical cyclone would have say, 230 km/h winds at the center, and about 300 km out from the center the winds are probably 100 km/h. Meanwhile an extra-tropical storm, or low pressure remnants, would likely have 80-100 km/h winds spread out evenly, with not much organization in the center of the storm. There's much more to tropical characteristics than just heavy rain and high winds, the structure of the storm is what matters. |
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Post by alex992 on Sept 19, 2018 14:06:38 GMT -5
Yeah, but if storm surge, high winds and heavy rain are what tropical characteristics are, then literally any low pressure that brings high winds, heavy rains, and high surf is a tropical cyclone. Which isn't true.
Did you read the rest of my post? Any meteorologist would agree that that's what tropical characteristics are.
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Post by alex992 on Sept 19, 2018 14:20:00 GMT -5
Yeah, but if storm surge, high winds and heavy rain are what tropical characteristics are, then literally any low pressure that brings high winds, heavy rains, and high surf is a tropical cyclone. Which isn't true. Did you read the rest of my post? Any meteorologist would agree that that's what tropical characteristics are. Not disagreeing with your description of constitutes a hurricane/cyclone etc, but rather what constitutes characteristics - snow and frost here are characteristics of cold fronts, even though the patterns that deliver them bare little resemblance to the deep polar lows that formed them. Not talking about high surf in ex tropical storms, but storm surges -the last one here happened during calm conditions and clear skies, with the sea level rising steadily by nearly 3 metres, over a matter of hours. One thing I forgot to mention, is that extratropical storms tend to have rather cool or cold air at it's center, and derive energy from strongly contrasting warm/cold air masses while a tropical cyclone is warm at it's center and derives it's energy from warm, humid tropical air and warm ocean waters. Here's a rather simple picture showing the fundamental differences between the two.  As you can see, a tropical cyclone has a much stronger, defined center with the strongest winds near the center, while an extratropical cyclone has a weaker, more spread out center with the strongest winds away from the center. Also, you're not gonna derive much warm, tropical air, and have SSTs of 27 C or higher in New Zealand. That's why they lose their tropical classification. |
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Post by Deleted on Sept 19, 2018 14:24:09 GMT -5
Here they're often described as extratropical. They retain some of their tropical characteristics, such as high winds and rainfall, but are overall different in their structure and nature.
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Post by alex992 on Sept 19, 2018 14:36:50 GMT -5
One thing I forgot to mention, is that extratropical storms tend to have rather cool or cold air at it's center, and derive energy from strongly contrasting warm/cold air masses while a tropical cyclone is warm at it's center and derives it's energy from warm, humid tropical air and warm ocean waters. Here's a rather simple picture showing the fundamental differences between the two. Yep, I understand the difference between the two - as long as I can remember, tv forecasts and met services etc here, have tried to emphasize, that we don't get cyclones but ex cyclones, and why they are different. One thing I've noticed from studying tropical cyclones over many years, and having lots of experience with tracking them myself, is that tropical cyclones tend to weaken significantly and start to lose tropical characteristics once they pass about Cape Hatteras in North Carolina. And especially when you get later into hurricane season (October or November), these storms oftentimes have lots of cold air on the backside. Sandy in October 2012 was still a hurricane when it made landfall in the Northeast US, but had a lot of extratropical characteristics. Very large storm, with a massive wind field, contrasting air mass (warm air to the front side of the storm, cold air on it's backside). The cold air on the backside is what caused a massive blizzard in the Appalachians from PA down to NC. Still, remained organized and strong enough, and retained enough tropical characteristics to be considered a tropical cyclone. Actually I recant that last statement. Sandy was an extratropical cyclone when it made landfall, but it retained the hurricane-force winds and very high storm surge. |
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Post by alex992 on Sept 19, 2018 14:39:35 GMT -5
Here's a good video from the "backside" of Sandy in West Virginia. As you can see, blizzard conditions, some places got upwards to 100 cm from these snows!
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Post by Deleted on Sept 19, 2018 14:41:18 GMT -5
Here they're often described as extratropical. They retain some of their tropical characteristics, such as high winds and rainfall, but are overall different in their structure and nature. How much rain comes from these storms? During a storm last December, 341.4mm was recorded in Cumbria over 24 hours. |
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Post by alex992 on Sept 19, 2018 14:41:28 GMT -5
Here's another video from that, beautiful isn't it?
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