Tony is in Greenland dependent on good weather to do the second part of his aerial survey (the first part was in June when the weather was so good that they came home 4 days early). This time their pilot was a day late coming from Iceland because of bad weather and the bad weather has followed them to Greenland. This means that Tony needs to spend some extra time in Greenland to finish the job and will be away from home on his birthday on Sunday, coming back instead on Monday or Tuesday. Any later and this causes problems as Anne is scheduled to go to Sweden on Wednesday.
Meanwhile Gwen has a compulsory overnight trip with the whole of her class. They are cycling to a place near Grenaa and staying in some hut or house (not sure exactly until she comes back tomorrow). The problem is that today and tomorrow is scheduled to pour with rain so she is not looking forward to the ride at all. You can see whether it’s raining on her from here. The yellow blobs are rain clouds.