Epic downgrade: Hilary was not a tropical storm when it pummeled California, experts say
Briefly

On its approach to land - and even more so after it made landfall - the thunderstorm activity became increasingly disorganized and it lost its well-defined center at the surface, and those are two necessary criteria for something to be considered a tropical cyclone,
Post-storm analyses often reveal new information, and it is not uncommon for initial reports to change when systems are later examined with all available data and without operational time constraints.
Read at Los Angeles Times
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