Final answer:
The cloud described is a lenticular cloud, which forms due to moist air flowing over mountains and can contain high-speed winds within, despite appearing stationary.
Step-by-step explanation:
The cloud described in the question is known as a lenticular cloud. These almond or lens-shaped clouds form when moist air flows over mountains or other obstacles and is forced upwards, cooling and condensing into a cloud. Despite appearing stationary, the air inside a lenticular cloud can contain very strong winds, often exceeding speeds of 50 knots. Unlike the other types of clouds mentioned (an inactive frontal cloud or a funnel cloud), a lenticular cloud is associated with these particular atmospheric conditions and is not indicative of fronts or severe weather such as tornadoes typically related to funnel clouds.