G/WX can provide no guarantees. This unusual weather research project is now over 30 years old and on-going. The average accuracy of the G/WX Maps over this period has varied around 70%. This means that about 30% of the G/WX Maps may be incorrect.
Once again, this is WEATHER, therefore, nothing is guaranteed. It can and has occurred that the G/WX Maps have had a long run of proving out, and then a map or series of maps come up incorrect. But that is the weather.