Three types of satellite: Visible Image

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This is your typical comma head storm. The islands in the far left corner are Hawaii. Notice how the clouds extend from Hawaii to the Pacific Northwest (Washington and Oregon). This marks your cold front. Southeast of this large feature, the air is warm. Norhwest of this feature, it is cold. The ocean waters are relatively warm compared to the cold air mass moving over it which is why you see the numerous amount of little white dots behind this cold front. These white specs are cumulus clouds. The colder air moving over the warmer ocean waters sets up an unstable airmass. The warm front is not very well defined as is often the case out west but if you look closely, the clouds over Washington and Oregon as well as off the coast, are much smoother than the clouds extending southwestward from that area. These are stratus clouds due to the isentropic lift ahead of the warmfront, where air is constantly rising on a slant over the colder air below. The clouds that extend north and also swirl back into the center of the comma head is the occluded front. The center of that comma head is the low pressure system. The low has moved back into the cold air, as cold air fills into the system. The surface low is basically directly underneath of the mid or upper low (as opposed to it's typical cyclogenesis spot, downwind from the upper trough. This location is normally to the southeast of the upper low). The clouds in the interior of California is fog.

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