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9/30-10/5 Joaquin-Trough Interaction-DISCUSSION/OBS


bluewave

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AmerWx as a whole has become very regional this year. You don't have a cat 3 bearing down on Miami so the interest level simply isn't there on a national level.

 

Now if the system really blows up, that's a different story.

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11PM advisory increased the intensity forecast substantially. 

 

FORECAST POSITIONS AND MAX WINDS

INIT 29/0300Z 26.7N 70.4W 35 KT 40 MPH
12H 29/1200Z 26.9N 71.0W 40 KT 45 MPH
24H 30/0000Z 27.1N 72.0W 40 KT 45 MPH
36H 30/1200Z 27.2N 72.8W 45 KT 50 MPH
48H 01/0000Z 27.4N 73.4W 50 KT 60 MPH
72H 02/0000Z 28.6N 74.0W 55 KT 65 MPH
96H 03/0000Z 32.4N 74.0W 55 KT 65 MPH
120H 04/0000Z 38.0N 74.0W 55 KT 65 MPH

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11PM advisory increased the intensity forecast substantially. 

 

FORECAST POSITIONS AND MAX WINDS

INIT 29/0300Z 26.7N 70.4W 35 KT 40 MPH

12H 29/1200Z 26.9N 71.0W 40 KT 45 MPH

24H 30/0000Z 27.1N 72.0W 40 KT 45 MPH

36H 30/1200Z 27.2N 72.8W 45 KT 50 MPH

48H 01/0000Z 27.4N 73.4W 50 KT 60 MPH

72H 02/0000Z 28.6N 74.0W 55 KT 65 MPH

96H 03/0000Z 32.4N 74.0W 55 KT 65 MPH

120H 04/0000Z 38.0N 74.0W 55 KT 65 MPH

If the shear relaxes on this for a while, I could see this becoming a hurricane, though I doubt higher than Cat 1 due to the eventual interaction with the trough. Although, the waters under it are essentially untouched and above normal SST...

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That strengthening and those coordinates are pretty alarming for nj/NYC. Basically a strengthening tropical system moving n/nw towards the coast of megalopolis. Warm waters underneath it, strengthening interaction with trough to the west and an already moisture laden area from the frontal rains and tropical fetch and onshore flow. Major issues with flooding rain and potentially devastating effects to beaches and coastal regions . the block to the north gives this serious legs.

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I have a feeling SNJ is going to be the bullseye again.

 

If you don't want to count Sandy as a hurricane hit...this thing arriving as a hurricane in S Jersey (i.e. a landfalling hurricane) would be the 1st since September 1821.

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I think the GFS this run is overdoing how much rain it has east of the track. A landfalling storm in S NJ or DE would have much more rain over PA and along/west of the track. I can't remember a strong landfalling system in the Northeast or that tracked through the Northeast with the heavy rain axis east of the center. That of course doesn't stop a lot of rain with the front coming through or back through from the east like the GFS has. 

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TS is barely discernible this run on the GFS. 

It's been like that for several runs. The GFS has never really bought into the idea of strengthening Joaquin. 

 

We need the trough to cut off so that the anti-cyclone forms overhead and then the shear would disappear. Then you roll the dice with regards to where the landfall occurs and intensity.

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One last wallop on Saturday night as the system beings lifting North. 9"+ back to Western Morris County. 10-12" for NYC and LI. 12"+ for the NJ coast from Sandy Hook South.

 

LOL I feel like I should be giving snow totals.

 

And that is just with the second system. As mentioned, it has most of tomorrow night passing NW.

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