Modifiers matching storm:

• violent,
• periodic,
• severe,
• serious,
• real,
• tropical,
• powerful,
• atmospheric,
• important,
• unusual,
• weather,
• oceanic,
• moving,
• seasonal,
• intense,
• larger,
• fierce,
• historical,
• coastal,
• major,
• dangerous,
• bad,
• damaging,
• destructive,
• isolated,
• disastrous,
• fast,
• furious,
• deadly,
• small,
• catastrophic,
• incoming,
• local,
• large,
• individual,
• devastating,
• world,
• extreme,
• strong,
• terrible,
• unpredictable,
• widespread,
• significant,
• localized,

Simple categories matching unpredictable:

• situation,
• catastrophe,
• contingency,
• misfortune,
• event,
• storm,
• danger,
• force,
• occurrence,
• disruption,
• illness,
• disturbance,
• sound,
• shock,
• disorder,
• risk,
• phenomenon,
• motion,
• change,
• signal,
• upheaval,
• blessing,
• circumstances,
• condition,
• object,
• current,
• problem,
• episode,
• weather,
• noise,
• behaviour,
• cause,
• break,
• incident,
• domain,
• accident,
• process,
• action,
• disaster,
• system,
• disease,
• elements,
• hazard,
• thing,
• fluctuation,