Hurricane Irene Anchor Position Logic

Irene Anchor Position Logic

We’ve moved a short distance to the east and reset the anchor. Winds so far are east to northeast, at anything from a few to 25 knots. The drawing upper left represents the circulation of a northern hemisphere depression. As you can see, the wind direction we have indicates the track is to our left or west.

Irene Anchor Position Logic 2

Our logic is in choosing this spot is as follows:

  • We have protection from ESE through NW, so we are covered if the hurricane veeres to the east of us.
  • There is room to drag to leeward.
  • We are (hopefully) far enough from shore to limit damage from flying debris.

Irene Anchor Position Logic 2 2

Bands of rain are showing up now on the radar. The question mark  shape above is the anchorage and t he solid colors outside are dense rain.

Irene Anchor Position Logic 112

This type of radar signature is typical of tropical storms. Right now the rain is pouring down, but in a few minutes it will be gone. Deck drains are open and we are filling the tanks.

We are on a single anchor, our big ROCNA, with dual snubbers. One snubber is 50 feet (15m) long and made from 3/4″ (19m) nylon. The second is 7/16″ (11mm) and fifteen feet (4.5m). If we were in deep water, with a bit of chain catenary to soften shock load we’d not bother with snubbers. But here it is just seven feet (2.15m) so  we need a bit of elastic in the system.

Both booms are out at a 45 degree angle, to provide aft windage. So far there  is very little shearing.

Irene Anchor Position Logic 110

We’ve had a lovely dinner, good conversation, the first lightening and thunder of the party has arrived, and  now its is time for a movie.


Posted by Steve Dashew  (August 27, 2011)




5 Responses to “Hurricane Irene Anchor Position Logic”

  1. Gary Barnes Says:

    Not “Gone with the wind” I hope!


  2. Stan Creighton Says:

    Steve, what do you use to attach the snubber to the chain rode? Good luck and thanks for collecting this “real” anchoring info.


  3. Steve Dashew Says:

    Howdy Stan:
    We use titanium shackles to attach the snubbers. They go around, rather than through, the chain.


  4. Aimede Says:

    Hi Steve

    i see on the pictures an apple… is to say you used a Macintosh for yours softwares

    – what Macintosh model?
    – on the Coastal explorer i dont find any softwar for Macintosh… can you give more informations.

    Thanks again


  5. Steve Dashew Says:

    Howdy Daniel:

    We are using a Mac Mini for the navigation computer. Coastal Explorer runs in Parallels (Parallels emulates the PC operating system). We al o use Parallels on a Imac to run our engineering software, all of which is PC based.