Answer:

Introduction:
Today, the weather is going to be warm. This means that the temperature is expected to be higher than usual, resulting in a pleasant and comfortable day.

Explanation:
Here is a detailed explanation of why the correct answer is option 'B' - Warm:

1. Weather Conditions:
The term "weather" refers to the atmospheric conditions at a specific time and place. It includes factors such as temperature, humidity, precipitation, wind speed, and cloud cover. In this case, the focus is on the temperature, which is expected to be warm.

2. Importance of Temperature:
Temperature plays a crucial role in determining the comfort level and activities of individuals. When the weather is warm, people can engage in outdoor activities, wear lighter clothing, and enjoy the pleasant atmosphere. It is often associated with positive emotions and a sense of relaxation.

3. Other Options:
Let's consider the other options and why they are not the correct answer:

- Option 'A' - Hopeful: The term "hopeful" is usually associated with emotions or expectations, rather than weather conditions. It does not provide any specific information about the temperature or other weather factors.

- Option 'C' - Blue: The term "blue" typically refers to a color, rather than a weather condition. It does not convey any information about the temperature or other weather factors.

- Option 'D' - Urgent: The term "urgent" is unrelated to weather conditions. It typically refers to a situation that requires immediate attention or action. It does not provide any information about the temperature or other weather factors.

Conclusion:
In conclusion, the correct answer is option 'B' - Warm. This indicates that the temperature is expected to be higher than usual, resulting in a comfortable and pleasant day. It is important to consider the weather conditions when planning activities or dressing appropriately for the day.