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General DesignCAD Topics => Totally Off-Topic => Topic started by: Lar on October 04, 2016, 08:12:13 AM

Title: Hurricane Matthew
Post by: Lar on October 04, 2016, 08:12:13 AM
Well, folks, it's been beautiful all yesterday and this morning but now I am finally seeing some rain. The hurricane is hitting Haiti right now and, according to Google Earth, is about 460 miles away, so I don't know if this rain is directly a part of Matthew or just some side action (before yesterday it was raining quite a bit). The sky is overcast but still very blue.

Matthew isn't scheduled to get here (New Providence Is, where Nassau is) until around 8am Thursday but the southern Bahamas will be feeling the effects tomorrow.

I will keep you posted long as I have an internet signal.

Lar
Title: Re: Hurricane Matthew
Post by: DrollTroll on October 04, 2016, 08:20:18 AM
Hunker down and come out safe the other side!
Title: Re: Hurricane Matthew
Post by: Lar on October 04, 2016, 08:25:47 AM
Thanks DT,

...But be warned, hurricanes that originated in the Bahamas (eg, Katrina) or passes through most of the Bahamas (eg, Sandy) hit the US pretty hard, so keep your fingers crossed over there. I will be keeping mine crossed over here.
Title: Re: Hurricane Matthew
Post by: samdavo on October 04, 2016, 02:26:43 PM
Lar,  Is the Bermuda triangle isosceles or equilateral?    PS Good luck with that storm.
Title: Re: Hurricane Matthew
Post by: Lar on October 04, 2016, 08:43:36 PM
Lar,  Is the Bermuda triangle isosceles or equilateral?
Sam, the answer to that was coming to me but it got lost on the way.

PS Good luck with that storm.
Thanks. I'll hold on to that.

Lar
Title: Re: Hurricane Matthew
Post by: samdavo on October 05, 2016, 01:54:10 AM
140 mph? sheesh
Title: Re: Hurricane Matthew
Post by: Lar on October 05, 2016, 08:20:18 AM
Well, according to Google Earth, Matthew is just entering the southern Bahamas right now, about 260 miles south of me, and is scheduled to get here by 8am tomorrow. The sky is overcast but still blue and it's raining lightly on and off with no wind.

The biggest problem right now is of the 5 gas stations within 2+ miles of me, only one is still open and everyone who didn't get gas yesterday is in a traffic line trying to get to that one station. Although I knew that, of all the gas stations in New Providence Is., if one is still open it would be that particular station, I actually tried 3 others before that one because I knew it would be crowded (and it's the closest one to me). I had to take a bunch of side streets and cross a vacant lots to get as close as I could then walk the rest of the way with 2 gas containers.

Lar
Title: Re: Hurricane Matthew
Post by: DrollTroll on October 06, 2016, 06:25:38 AM
Thinking of you Larry! I hope you make it through unscathed.

Also, if any of our readers are in Florida, or anywhere on the southeastern coastlines, please take all necessary precautions. I don't want to lose any members of our little community here.
Title: Re: Hurricane Matthew
Post by: samdavo on October 06, 2016, 07:34:37 PM
Storm Surge defined here :-
https://en.wikipedia.org/wiki/Storm_surge
including the two components of storm surge, namely 
a) fetch of winds spiraling inward toward the storm, and
b) a low-pressure-induced dome of water drawn up under and trailing the storm's center;

also
c) shallowness and orientation of the water body relative to storm path, and
d) the timing of tides

and including an example of summing "normal tide" to "storm surge" (2 cents).
I note that the storm surge for Matthew could reach 9 feet (!)

PS You would assume that storm surge would be worse for Florida than for islands off the US coast, based on coastal shape. (?)
Title: Re: Hurricane Matthew
Post by: samdavo on October 06, 2016, 07:47:51 PM
I post that mainly for my own thinking aloud purposes - because I once calculated the low pressure effect, (lifting the dome of water) to be less than 1 foot - hence the majority appears to be the wind driven effect ...  plus timing and height of tide of course.   

Hopefully, with almost quarter moon (rather than full or new), there won;t be a king tide (?)

(edit) oops - Normal atmospheric pressure 1013 millibar,  Matthew 935 (?) - I think that might be more like 2.5 feet due to the lifting effect.

PS Just reading about this, Sandy apparently (also) had storm surge of 9 feet - and Katrina had 25 feet !! - sheesh.
http://time.com/4521888/hurricane-matthew-storm-surge/
Title: Re: Hurricane Matthew
Post by: samdavo on October 07, 2016, 02:06:49 PM
Good News is that Matthew now down form Cat 4 to Cat 3;  Bad News ditto.
https://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=3471
By: Jeff Masters , 4:16 PM GMT on October 07, 2016
Record to near-record storm surge possible in far north Florida, Georgia, and South Carolina

...good news/bad news situation: while the ERC reduced the hurricane’s peak winds from Category 4 to Category 3, strong winds have now spread out over a wider area, which will increase the storm surge, due to all the extra water that will be put in motion by an expanded wind field. To illustrate, tropical storm-force winds extended 160 miles to the northeast of Matthew’s center at 11 am Thursday, but by 11 am Friday, these winds had expanded to extend outwards 185 miles from the center. At 11 am EDT Friday, the coast from just south of Cape Canaveral, FL to just south of Wilmington, NC was under a storm surge warning under a prototype NHC system expected to become operational next year. As Matthew moves northward, the northeast winds ahead of it will pile water against the coastline, leading to what could be record or near-record storm surges in some areas.
Title: Re: Hurricane Matthew
Post by: Lar on October 17, 2016, 12:16:50 PM
Hi guys, all is well, just testing my internet (my modem was damaged). Will update...

Lar
Title: Re: Hurricane Matthew
Post by: bdeck on October 17, 2016, 02:28:24 PM
Hi Lar,
 
Glad to see you made it back to cyberspace. We were about to send out the Saint Bernards, but it was too far to swim.

Maybe we'll send them to look for Per instead. Here's hoping he's OK too.

bd



Title: Re: Hurricane Matthew
Post by: Lar on October 17, 2016, 06:16:36 PM
Thanks bdeck. Matthew was no joke! Let it be known that hence forth St. Matthew will be known as The Patron Saint of Tree Haters.

Lar
Title: Re: Hurricane Matthew
Post by: Dempsey on October 17, 2016, 08:24:12 PM
Hello Lar,

Glad to hear that you survived Matthew.
Title: Re: Hurricane Matthew
Post by: DrollTroll on October 19, 2016, 06:38:21 AM
Hurray, Lar made it! So glad to hear you're safe, brother!
Title: Re: Hurricane Matthew
Post by: Lar on October 20, 2016, 05:52:28 AM
Thanks for all the concern guys.

The winds were pretty severe but flooding is what everyone was afraid of. I live about a mile and a half from the southern coast and predictions that the entire south of the island would flood, right up to my street, was being passed around on Whattsapp. I'm on the north side of that street and that side has low hills running along it. That along with the fact that so much end of the world junk gets passed around on Whatsapp (especially when hurricanes are approaching) had me only slightly concerned. I was preparing to hunker down and quietly wait out the storm when my daughter, who lives in a flood prone area on another island, was coming to Nassau to wait out the storm with us. Then my son informs me that 2 of his friends would also be joining us. Wait, was this supposed to be a party???

Matthew was supposed to make land fall around 2am and word got around that the electricity would be turned off at 11 that night. It went off around 10 and rather than crank up the generator we decided to just go to bed. Around 11 I noticed the electricity was back on. Next thing everyone was up and we were watching 'Lights Out', followed by playing Family Feud (the mobile app), followed by watching a few episodes of 'Whose Line Is It Anyway?', which naturally would be followed by the Dave Chappelle Show's Wayne Brady episode, followed by the Rick James' episodes, followed by the Prince episode. It was around 3am before the electricity went off again and we retired for the night. With everything off I then realized how intense the wind was and over the course of the night I was awaken every now and then as ever increasing gusts crashed into the house.

When I awoke the next morning the storm was still raging. I opened a window shutter (away from the wind) and saw a sea grape tree in the front yard slowly being uprooted. Coconut trees that lined my neighbor's property across the street were in an intense battle with the wind, and they were putting up a good fight. I went to open a back door to step out onto my *secure* patio to view the storm and I could not pull the door open. The pressure inside the house pinned the door shut and I had to use all my strength to open it. Once outside it was amazing to see which trees had been blown down, which remained standing and which were in between.

Afterwards I went back inside and ventured onto my *secure* front porch. Upon slightly opening the door the wind, rain and door teamed up against me in a fierce battle to keep me inside. When I did make it outside it was amazing watching the rain being swept sideways by the powerful wind gusts along my street. The good thing was there was no sign of flooding.

Later on, when the eye passed and the more powerful winds started battling us, the coconut trees across the street began to lose their battle. By the time the storm passed, of about 10 trees only 3 remained standing. A neighbor who is about 400 feet south of me informed that flood waters came to about 200 feet from his house. The south of the island did flood but it just did not make it to my street. Many of the trees on my property were blown down or the tops snapped off. Telephone and cable/internet lines attached to my house were on the ground. I later was able to get most of them back up myself, after noticing that they were still connected to the poles (and while the electricity was still off). It took about a week before my electricity came on, when just down the street their lights were on a few days before. Parts of the island are still without lights. One good yet ironic thing is that the island where my daughter lives did not experience a direct hit so she actually should have stayed home. But it was good having her spend time.

Lar