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Old 20-03-2017, 10:54   #1
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Use of RTOFS for Current.Gribs - Gulf of Maine

I am lost in a sea of data on the RTOFS site trying figure out how to get a Current Grib to use with Weather_Routing_pi for a race from Marblehead to Halifax in July. Weather_Routing_pi has a checkbox for Currents that will use these files.

If someone has some experience with this I'd appreciate a little guidance.
Do I use "Full Volume" or "Surface" RTOFS?
Here is the beginning of the DATA down load page
WAVE Products

These are the type of RTOFS files I think we need but I can't figure out where to get them.

ofs_atl.t00z.n024.gma.grb.std - interpolated to standard lat-lon grid For Nowcast

ofs_atl.t00z.f024.gma.grb.std - interpolated to standard lat-lon grid For Forecast

Thanks
Rick

PS: Has some good general information about Gulf of Maine Tides and Currents Tides and tidal currents on the Maine Coast
but I am specifically looking for Current.Gribs!
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Old 20-03-2017, 12:34   #2
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Re: Use of RTOFS for Current.Gribs - Gulf of Maine

Rick,

The I use the "NOAA Operational Model Archive and Distribution System" (NOMADS) as a source of both wind and surface current GRIB files for the Weather_Routing_pi. Here is the link

NOMADS-NOAA Operational Model Archive and Distribution System

I use the Grib Filter feature on that web page. The wind GRIBs can come from from one of the GFS data sets, and the surface current can come from an RTOFS data set (near the bottom of the NOMADS page).

These RTOFS parameters must be selected for the surface current:
Code:
UOGRD
VOGRD
Check the box next to "subregion" to download a smaller region than a whole ocean and fill in
Code:
leftlon=
rightlon=
toplat=
bottomlat=
Longitude and latitude numbers are specified in degrees. West longitude or south latitude require a minus sign.

You will find that each time you select the parameters you can download a forecast for a single time. Try it a few times, but you will find it easier to ask for the URL that gets the download. A batch file can be built using the URL as a template with each line in the batch file calling out a different forecast time.


Paul
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Old 23-03-2017, 11:20   #3
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Re: Use of RTOFS for Current.Gribs - Gulf of Maine

Thankyou Paul!
Thats hugely helpful. Stay tuned I may have a question or two.
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