Take a look at the equations for the geostrophic wind.
First the hydrostatic equation:
$0 = -g - \frac{1}{\rho} \frac{dP}{dZ}$
Rewrite it as:
$g \rho = -\frac{dP}{dZ}$
This tells us that the density of the air multiplied with the gravitational acceleration equals the negative vertical pressure gradient.
Therefore having only half of Earth's gravity makes the vertical pressure gradient only half as steep. Added to that less gravity would mean that the planet won't be able to hold as much atmospheric mass so the density of the air will be lower as well decreasing the vertical pressure gradient even further.
Second the geostrophic equations:
$fv=\frac{1}{\rho} \frac{dP}{dX}$
$fu=-\frac{1}{\rho} \frac{dP}{dY}$
The first one says that the meridional wind speed times the Coriolis Parameter equals the zonal pressure gradient times the inverse of the density.
The second one says that the zonal wind speed times the Coriolis Parameter equals the negative meridional pressure gradient times the inverse of the density.
The Coriolis Parameter only depends on the angular speed of the planet's rotation and the geographic latitude. As your planet should be rotating as fast as Earth the Coriolis Parameter will be the same.
If you reduce the density in those formulas while keeping the rest the same you get an increase in wind speeds with the same horizontal pressure gradients.
This makes sense since a less dense volume of air has less mass and therefore less energy is needed to accelerate it to a certain speed.
But in this situation the vertical pressure gradient is flatter so it's questionable if the same horizontal pressure gradienst as on Earth are even possible or if those are decreased as well, and I think they are. If they are the situation is similar to Earth, otherwise you'd get higher wind speeds.
Keep in mind however that lesser density - which is certain on your planet - means that the winds have less impact overall, since there is less mass in a volume of air there is less impulse. So in general I'd say your windstorms might get faster than on Earth but certainly not more devastating, more likely the opposite.
With Hurricanes there's also the question of vertical convection. With the flatter vertical pressure gradient convection will generally be weaker, so thunderstorms and tropical storms will generally be weaker as well.