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Random 5 questions:
1. What is a SPECI?
2. Refer to the following TAF extract:
BECMG 1821 2000 BKN004 PROB30 BECMG 2124 0500 FG W001
What does the abbreviation BKN004 mean?

3. (Refer to figure 050-58) At which position is the development of thunderstorms most likely, and what is the maximum height of the CB clouds at 00 UTC?

4. What does the term SIGMET signify?
5. The 500 hPa contour chart is equivalent to: