This is what occasionally happens to your outdoor plants when you are married to a basket maker who teaches around the country. My poor, welcoming palm plant used to sit on our small porch inside a regal container, next to the front door. During the summer, we left for a trip and forgot to take the plants on the porch inside. This plant got scorched by the hot sun. I brought it inside and tried to save it. I guess putting it next to the old radiator did not help.
Poor plant.