Following on from the 'How to use the Offshore App' Webinar recorder 5th November 2020, we answer the 5 most commonly asked questions.

To view the webinar click here

Here are the 5 most commonly asked questions from the Webinar:

  • How do I set up my boat polars
  • What is CAPE?
  • Which model is more accurate?
  • What PredictWind Forecast subscription level do I need?
  • Can I see the link to the first webinar?

1/ How do I set up my boat polars

Polars describe your boat speed and wind angle in any given weather situation. Setting the polars in your PredictWind account is important to get an accurate weather route. It is essential you set the polars in your account before using the weather routing and departure planning tool on any of the PredictWind platforms.

Setting up your Polars in your PredictWind account must be completed on the PredictWind forecast website or within the PredictWind App. Once you have these set up they remain in your account for use in all platforms including the Offshore App.

Please go to the weather routing page on the PredictWind website, then go to Routing Preferences, and you will see the Boat Polar button. Please also see the help at https://help.predictwind.com/articles/2884506-how-to-set-up-boat-polars-all-platforms for detailed instructions on setting up boat polars.

2/ What is CAPE

CAPE stands for Convective Available Potential Energy and is the amount of fuel available to a developing thunderstorm. More specifically, it describes the instability of the atmosphere and provides an approximation of updraft strength within a thunderstorm. So, CAPE is used by weather officials to understand what the potential might be for thunderstorms and how powerful those storms might become if they do materialize.

The standard measurement of energy is represented as Joules Per Kilogram. A high CAPE value might also be expressed by weather experts by using the term “high instability”. When we talk about a highly unstable atmosphere, CAPE values are usually in excess of 2500 J/kg’s which would supply ample energy for strong updrafts and violent thunderstorms, should they develop.

You can learn more about CAPE and other indicators for predicting severe weather at https://www.predictwind.com/news/indicators-predicting-severe-weather/

3/ Which model is more accurate?

Unfortunately there is no "golden rule" for which model is more accurate. Often there are periods where one model is better, then it swaps around. If all models are similar you can have more confidence in the forecast. If they are very different it just shows the uncertainty in the situation. As well as our proprietary PWG & PWE models we also provide the GFS/ECMWF models as another source for comparison. With 2 models it can be difficult to decide on which forecast to select, but with 4 models the decision is a little easier.

To clarify the terminology the PWG stands for the PredictWind weather model that uses the NOAA global initial conditions for the model run and PWE is the PredictWind weather model that uses the ECMWF global initial conditions, both of these sources enable us to run our own worldwide weather models, we are the only private company in the world that has the technology to do this.

4/ What PredictWind Forecast subscription level do I need for weather routing and accessing GRIB files?

You will require the standard or professional level of PredictWind Forecasting subscription.

Standard: US$99/ 3months or US$249/ year. This includes everything on the Basic plus;

  • Daily briefing
  • Forecast tables and graphs
  • Maps include wind, gust, CAPE, wave, rain, cloud, isobar and air temp
  • Solunar data
  • Download 50km & 100KM GRIB files using the Offshore App on an internet or cellular connection.
  • PWG & PWE 1km wind Maps
  • ECMWF 14km wave Maps
  • Real-time observations and forecast alerts.
  • 1km sea surface temp Maps
  • Weather routing
  • Departure planning
  • Destination Spot Forecast
  • Access to GRIB files/Satellite imagery & GMDSS forecast over a satellite connection.
  • PWG / PWE 8km High Res GRIB files

Professional: US$249/ 3months or US$499/ year. This includes everything on the Standard plus;

  • Ocean and tidal current GRIB files
  • SST sea temp GRIB files
  • PWG / PWE 1km High Res GRIB files
  • ECMWF Global 9km GRIB files

5/ Can I see the link to the first webinar?

The webinar for the Atlantic Crossing Preparation recorder 30th October 2020can be viewed here

A link to the 5 most commonly asked questions from this webinar can be seen here

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