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Major Hurricane Irma


NJwx85

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noob question i was hoping someone could help, the tracks early yesterday seemed to have the current wnw trend over PR but than taking more of a directly western track for a day or 2 before turning back nw and to the north. What has caused this dramatic change that seems to be affecting the models because the current track seems right on line with where the older models had it while ending up on the western side of Florida. thanks

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12 minutes ago, NJwx85 said:

Posted this earlier, still looks to be the same. St. Thomas is going to take a direct hit unless a significant Northern shift occurs very soon. According to the radar, an island wide tornado warning has been issued for that island, although I cannot locate the text anywhere.

Was just looking at latest model/official tracks and they were all a bit north of St. Thomas.  Does anyone have any analysis about this initial motion as it relates to future track?

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Just now, sojitodd said:

I really wish the motion would be showing  more of a northerly component...it looks like the southern eyewall will be very close to the San Juan urban area. Scary.

This would actually be GREAT for Puerto Rico.  The running joke among the folks working with the PR government right now is that a hurricane would save the island by cleaning out unneeded housing stock and triggering a flood of federal aid that's desperately needed.

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Just now, bobbutts said:

Was just looking at latest model/official tracks and they were all a bit north of St. Thomas.  Does anyone have any analysis about this initial motion as it relates to future track?

I'm not entirely sure, the 12z GFS has Irma narrowly missing PR, however I think it might still be too far North. The radar really doesn't have much of a Northerly component to it.

59b01832d9689.png

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52 minutes ago, NWLinnCountyIA said:

Despite the intensity debate, there has to have been some sort of record set for maintaining 180+mph for over 24 hours now. That, is insane.

As it stands right now, the 1.25 days with an intensity of 155 kt+ ties the NAtl record first set by Allen '80, although Allen did it in three separate stints while Irma has done it in one. Globally going back to 1970, only Angela '95, Meranti '16, Chaba '04, and Haiyan '13 have maintained for longer, with the former two netting 1.75 days and the latter two 1.5. Irma is in some rare company.

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10 minutes ago, gymengineer said:

Extreme Wind Warning
VIC020-030-061715-
/O.NEW.TJSJ.EW.W.0001.170906T1516Z-170906T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
Extreme Wind Warning
National Weather Service San Juan PR
1116 AM AST WED SEP 6 2017

The National Weather Service in San Juan has issued a

* Extreme Wind Warning for...
  Saint John in Virgin Islands...
  Saint Thomas in Virgin Islands...

* Until 115 PM AST

* At 1114 AM AST, National Weather Service Doppler radar indicated
  extreme winds, associated with the eyewall of Major Hurricane
  Irma, about to move over St John, moving west at 20 mph. This
  extreme winds will affect St John and St Thomas through 100 PM
  AST. This is an extremely dangerous and life-threatening situation!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Treat these imminent extreme winds as if a tornado
was approaching and move immediately to the safe room in your
shelter. Take action now to protect your life!

The safest place to be during a major landfalling hurricane is in a
reinforced interior room away from windows. Get under a table or
other piece of sturdy furniture. Use mattresses, blankets or pillows
to cover your head and body. Remain in place through the passage of
these life-threatening conditions.

Interesting...

NHC advisory says WNW track. This advisory notes a west track. Radar seems to indicate to me a track oscillating between WNW and W.

Critical difference for these islands.

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2 minutes ago, USCG RS said:
4 minutes ago, Tullioz said:
The tornado warning is showing up on the radar screen. Not sure why it's not include it in the text. 

59b01754876dd_tornadowarning.jpg.6c257c66352884ced57842c3b0baa818.jpg

 
 

It's an extreme wind warning. They're saying treat it as a tornado.

Also in their Hurricane Local Statement they have this section (with the assumption that one or even a water spout, could spin up at any time) -


* TORNADOES:
Protect against a tornado event having possible limited impacts
across PUERTO RICO AND THE US VIRGIN ISLANDS. Potential impacts
include:
    - The occurrence of isolated tornadoes can hinder the execution
      of emergency plans during tropical events.
    - A few places may experience tornado damage, along with power
      and communications disruptions.
    - Locations could realize roofs peeled off buildings, chimneys
      toppled, mobile homes pushed off foundations or overturned,
      large tree tops and branches snapped off, shallow-rooted trees
      knocked over, moving vehicles blown off roads, and small boats
      pulled from moorings.

http://forecast.weather.gov/showsigwx.php?warnzone=VIZ001&warncounty=VIC030&firewxzone=VIZ001&local_place1=Charlotte Amalie VI&product1=Hurricane+Local+Statement&lat=18.349&lon=-64.9304#.WbAYYtGQy00

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4 minutes ago, Drz1111 said:

This would actually be GREAT for Puerto Rico.  The running joke among the folks working with the PR government right now is that a hurricane would save the island by cleaning out unneeded housing stock and triggering a flood of federal aid that's desperately needed.

With Harvey and whatever impacts Irma has on the US mainland, I have a feeling PR would be getting the short end of the stick when it comes to federal aid with this one. Just destruction, misery, damage, deaths, and a further depopulation as more people flee to the mainland US. This hurricane is not hitting that area in a vacuum of no other events anywhere else. In fact, with the mainland US taking a hit and along with Harvey, this would be the worst possible time for the south eyewall to hit San Juan.

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