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Major Hurricane Irma


NJwx85

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7 minutes ago, Suncat said:

Something not being discussed here is the influence the development of a low near Missouri will have on steering Irma north then northwest.  The timing of the northward turn will depend on the timing of the development and strengthening of this low. NWS Raleigh is leaning toward a faster turn to the north with the hurricane tracking along the eastern coast of Florida and then a turn to the northwest between Georgia and South Carolina.  At this point, some of the models may not taking this low into consideration.

Correct. This is what's making the upper level jet streak north of Irma bend northwest. It's this anticyclonic shaping of the jet streak that's acting like a giant vacuum cleaner sucking Irma north and westward. It also makes for a great outflow channel that might help Irma stay strong assuming the wind shear doesn't encroach too for into the core.

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1 minute ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

Well, won't the surge still be devastating for the keys regardless of the eye coming on shore in northern Cuba?

 

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3 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

It's a visitor evac that starts tomorrow.

I assume they are staging it (visitors, then residents) to ease the bottlenecks on those tiny little roads. 

(Unless there have been significant upgrades in the highways there--haven't been in at least ten years.)

Plus, Keys residents can be remarkably stubborn about evacs. Source: family members in Marathon and Key West who rode out Wilma. 

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3 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

Because there is one single lane road to get everyone out.

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Just now, Crazy4Wx said:

Well, won't the surge still be devastating for the keys regardless of the eye coming on shore in northern Cuba?

 

I'm not sure.  Georges I thought was a 2 when it passed west of Key West and the surge wasn't awful.  I think you need to have a high end 2 or low 3 at least 

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4 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

I don't have inside knowledge but it has to take a long time to get everyone off since there's only one road connecting the mainland.

Last thing you want is to be stuck on it when the storm strikes.

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3 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

Simply put, time. You will potentially have the southern third of Florida evacuating in the next 3-4 days 

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4 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

Part of the problem is that the only way out is a narrow road that's only one lane in most spots. Also in many places the roadway is at sea level. They probably also are trying to do a systematic evacuation so that they can gradually get people out rather than all at once.

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4 minutes ago, SnowGoose69 said:

I'm not sure.  Georges I thought was a 2 when it passed west of Key West and the surge wasn't awful.  I think you need to have a high end 2 or low 3 at least 

The surge even without a direct hit is going to be tremendous with all that water flowing west on the NE Side or IRMA

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4 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

Then again what if it don't .  Then you lose a day while everyone from south Florida starts moving on out . Better to be safe then sorry . Might pay off in the end . 

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3 minutes ago, bobbutts said:

I don't have inside knowledge but it has to take a long time to get everyone off since there's only one road connecting the mainland.

Last thing you want is to be stuck on it when the storm strikes.

Especially since most of the road is right on the ocean.

Image result for road in florida keys

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Just now, Crazy4Wx said:

Well, won't the surge still be devastating for the keys regardless of the eye coming on shore in northern Cuba?

 

Surge for the Keys is somewhat self-limiting as the surge will hit the reef first. In the 1935 storm, they had 40-50' waves at the reef, and what did make it to land was enhanced because a lot of the cuts and creeks were plugged up by railroad. That said, a 20' storm surge will wipe most anything off the keys. 

 

Even Donna only had about a 6' surge when it passed over Marathon (per the water marks in house I was living in). 

 

1 minute ago, thess said:

It's a visitor evac that starts tomorrow.

I assume they are staging it (visitors, then residents) to ease the bottlenecks on those tiny little roads. 

(Unless there have been significant upgrades in the highways there--haven't been in at least ten years.)

Plus, Keys residents can be remarkably stubborn about evacs. Source: family members in Marathon and Key West who rode out Wilma. 

I lived in Marathon in the late 1960s. People will stay. (but per the MCSO, the evacuation is for everyone and starts tomorrow morning at 7.

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Just now, Ginx snewx said:

The surge even without a direct hit is going to be tremendous with all that water flowing east on the NE Side or IRMA

I guess the thing is Georges was destroyed by Hispaniola of east Cuba too so the remnant surge was probably mostly gone.  I would think as you say above this one might have a greater leftover rise in water from when it was a Cat 4 or 5 just a day earlier 

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8 minutes ago, SnowGoose69 said:

You wonder why they couldnt have waited another day to evacuate the Keys.  If this ends to slamming into Cuba as long as the Euro shows hypothetically it probably comes out as a Cat 1 and you have another dangerous what if one really does happen one day and people don't evacuate 

I think this decision may be largely because the Cuba / No Cuba scenario is somewhat academic for the Keys. As the Gulf Stream pumps through the Florida Strait, it will be met with contrary, long-fetch winds for a couple of days prior to the arrival of the storm. The seas around that area are going to be massive, and steep. There's a very good chance of significant impact from that, alone.

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