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In the context of SIGMET issuance, it is important to understand that SIGMETs (Significant Meteorological Information) are issued for specific areas rather than individual cities or airports. They focus on significant meteorological conditions that could impact the safety of flight operations, including severe turbulence, thunderstorms, icing, and volcanic ash.

The correct choice identifies cities that are major hubs or locations likely to be affected by significant weather events. This aligns with the primary purpose of SIGMETs, which is to keep pilots informed about hazardous conditions in airspace used by airlines and commercial operators.

While all the cities listed in the other options could theoretically warrant a SIGMET, the cities chosen in the correct response are particularly prone to weather conditions that would necessitate such warnings. For instance, Miami is known for tropical storms and hurricanes, Salt Lake City can experience significant winter weather, and San Francisco often faces fog and wind conditions that can affect aviation.

Thus, the answer reflects an understanding of where significant meteorological events are expected, which aligns with why SIGMETs would be relevant for those specific locations.