Prompted by both my own struggles with wgrib2 compilation and a plea on the rNOMADS email listserv, I’m going to describe how to compile and install wgrib2 on Mac OS. First of all, some background: wgrib2 is an excellent utility written by Wesley Ebisuzaki at NOAA.  It allows for ... [Read more...]

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Two years ago, I wrote a software package for R called “rNOMADS” that interfaces with online weather and sea ice model repositories to gather data in real time, for free.  The data are delivered in two ways: a simple, pure R, cross platform interface using GrADS-DODS, and binary files in ... [Read more...]

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I uploaded the newest version of rNOMADS to CRAN yesterday. This one has a new plotting function for wind altitude azimuth, and magnitude (see below for plot and source code). I also added a function for reading GRIB inventories, fixed a few typos, and tweaked a few functions. In other ... [Read more...]

The (relatively) recent upgrade of rNOMADS to version 2.0.0 allows cross platform support for downloading atmospheric and oceanic operational model data into R via the GrADS-DODS system.  However, users have been experiencing difficulty using DODS to get North American Mesoscale (NAM) real time data.  The script below shows an example of ... [Read more...]

The latest version of rNOMADS is now available on CRAN.  This update resolves several minor bugs and one major one involving multiple variable/level selections when using the ModelGrid function.  I have also added support for two more models on NOMADS:  Climate Forecast System Flux Products and Climate Forecast System 3... [Read more...]

The NOAA Operational Model Archive and Distribution System is a treasure trove of near real time and archived model outputs describing global and regional weather, sea ice, and wave data.  I developed the rNOMADS package about a year ago to make this available to R users. In this post, I’... [Read more...]

The rNOMADS package interfaces with the NOAA Operational Model Archive and Distribution System to provide access to 55 operational (i.e. real time and prediction) models describing the state of the ocean and the atmosphere. rNOMADS has been used to get wind and wave data for a real time sailing game, ... [Read more...]

About 6 months ago, I wrote a package for the R programming language called rNOMADS.  It interfaces with the National Oceanic and Atmospheric Association’s Operational Archive and Distribution System (NOMADS), comprising everything from global weather forecast models, to high resolution regional models, to wave and sea ice models.  rNOMADS uses ... [Read more...]