Questions About Station Plots
Q: Why is the precipitation type displayed as "Unknown" for some stations and times?
A: The precipitation type station forecasts are only plotted for times when GFS-LAMP is also forecasting the occurrence of precipitation (precipitation type is conditional on precipitation occurring). If the occurrence of precipitation is not being forecasted for a particular hour, the plotted precipitation type will appear as light gray for "NO PRCP." If the occurrence of precipitation is being forecasted at a station or time where the precipitation type forecast is missing, then a dark gray box will be plotted for "UNKNOWN PTYPE."
Q: How are the flight categories defined?
A: The flight categories represent aircraft regulations that occur under certain conditions. The following table details the ceiling height (Cig) and visibility. When one condition from two different flight categories is forecasted, the category with the highest threat level is chosen.
Q: Why can I sometimes see a station and click on it, but be unable to load its meteogram?
A: This will happen for the new stations that have been added during the development of GFS-LAMP. A station label will display if you scroll the cursor over its location, but there will not be a plotted forecast or a corresponding meteogram. Click here for more information on the new forecast sites.
Questions About Meteograms
Q: Why are the observations sometimes not shown?
A: Possible explanations include:
Q: Why are the analysis images sometimes old?
A: This can occur if there are no observations (see above), a computer job fails, or an image creation process fails. When this happens, the previously run images are not replaced with the most recent data. The looping controls on the analysis site will skip over these old images, but you can access these images by manually selecting them from the dropdown menu.
***These are issues that the GFS-LAMP team is aware of and working to resolve: