The maps are based on NOAA:n GFS-forecastmodels, they are calculated models so realized weather can can depart significantly from the forecasted.
GFS-forecastmodels are updated 4 times a day, our maps are updated once a day about 9am. On our weatherstation are the maps generated once NOAA's superduper-computers has get the models runned and released.
All times on maps are Zulu-times, thats same as GMT/UTC-time. In Denmark during summertime you must add two hours to that and during normal time you must add one hour.
Tip: You can also control the animation with the rollmouse.
RAIN FALL
Measurable rain refers to a rainfall total of 0.254 mm or greater. When you hear the terms isolated showers or few showers (10 to 20%), scattered showers (30 to 50%), or numerous showers(60 to 70%), in the forecast, this refers to the percent of the forecast area covered by measurable rain. For instance, scattered showers means that the forecast area WILL receive rain, and approximately 30 to 50 percent of the area will experience showers.