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In addition, a short period forecast called a TREND may be added at the end of the METAR covering likely changes in weather conditions in the two hours following the observation. These are in the same format as a Terminal Aerodrome Forecast (TAF). The complement to METARs, reporting forecast weather rather than current weather, are TAFs.
In the US, there are specific VFR cruising altitudes, based on the aircraft's course, to assist pilots in separating their aircraft while operating under visual flight above 3,000 ft above the surface (AGL) but below 18,000 ft Mean Sea Level (MSL). Unofficially, most pilots use these rules at all levels of cruise flight.
VFR / VMC visibility requirements in the US. In aviation, visual meteorological conditions (VMC) is an aviation flight category in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft maintaining visual separation from terrain and other aircraft.
3SM -SHRA BKN020 indicates that visibility will be 3 statute miles (5 km) in light (-) showers (SH) of rain (RA), with a broken ceiling (between 5 ⁄ 8 and 7 ⁄ 8 of the sky covered) at 2,000 feet (600 m) above ground level (AGL). Each line beginning with FM indicates a rapid change in the weather over a period of less than an hour.
Above ground level – In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL [1]) is a height measured with respect to the underlying ground surface. This is as opposed to altitude/elevation above mean sea level (AMSL), or (in broadcast engineering ) height above average terrain (HAAT).
The innermost ring with a radius of 5 nautical miles (9 km) typically extends from the surface area around the airport to 4,000 feet (1,220 m) AGL (above ground level; charted in MSL), and an outer ring, with a radius of 10 nautical miles (19 km) that typically surrounds the inner ring and extends from a floor at 1,200 feet (370 m) AGL, (also ...
Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. Pressure altitude divided by 100 feet (30 m) is the flight level , and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions).
Also, METARs are reported half-hourly from many airports, not hourly - in the UK half-hourly is the norm BaseTurnComplete 02:46, 21 February 2006 (UTC). The point of having the two examples (which were deliberate made as different as possible while trying to hold a few likenesses to show similarity) is to give the range of possibilities.