To do it, you need to find the cloud height in feet above mean sea level (MSL). That's as simple as adding the elevation of the reporting station to the reported cloud heights. Once you know the cloud heights in MSL, you can determine where you should fly, since altimeters are set in feet above MSL, not in feet AGL. Example: At Grand Forks International Airport (KGFK), clouds are reported broken at 7,000 feet AGL. Add the reported clouds of 7,000 feet AGL to the field elevation of 845 feet MSL to get a cloud base altitude of 7,845 feet MSL. Surface observations, no matter how advanced the system, have limitations. They're limited by location and time, so they only really apply to an airport's immediate area.
Supremacy Clause. Article VI, Paragraph 2 of the Constitution is commonly referred to as the Supremacy Clause. It establishes that the federal constitution, and federal law generally, take precedence over state laws, and even state constitutions. See Preemption;constitutional clauses.
As you already know, the United States Congress is comprised of two houses whose powers are derived from Article I Section 8 of the Constitution. The first 17 clauses of Section 8 list the enumerated or expressed powers of Congress. Clause 18, also known as the necessary and proper clause, gives Congress the flexibility to author any laws necessary to carry out those first 17 expressed powers. The extent to which Congress has stretched Clause 18 is often debated.