A rotating weather system has a tangential velocity of $100 \mathrm{~m} \mathrm{~s}^{-1}$, diameter of $1 \: \mathrm{ km}$ , and located at a latitude where the Coriolis parameter is $10^{-4} \mathrm{~s}^{-1}$. Which one of the following statements is true about this weather system?
- It is in geostrophic balance.
- It is in gradient wind balance.
- It is a high-pressure system.
- It is in cyclostrophic balance.
