Unwanted whitespace between plot title and subplots in matplotlib-CodePudding

I've 2 subplots in a single row. Below is the code:-

plt.suptitle('Water Vapor Count for Fani before landfall') #Overall plot title.

fig,(ax1,ax2)=plt.subplots(nrows=1,ncols=2,figsize=(15,15)) #Defining the figure and axes
image_wv_global=ax1.imshow(wvcount,vmin=800,vmax=975,label="Global") #First image
plt.colorbar(image_wv_global,ax=ax1,fraction=0.046, pad=0.04) #Colorbar for first image, declaring the axis in it is v.imp.

image_wv_asia=ax2.imshow(wvcount,vmin=800,vmax=975,label="Asia specific") #Second image
plt.axis([300, 1000, 200, 700])  #Axis restriction for asia-specific plot
plt.colorbar(image_wv_asia,fraction=0.046,ax=ax2, pad=0.04) #Colorbar for 2nd subplot

ax1.title.set_text('Global plot') #1st subplot title
ax2.title.set_text('Asia-specific plot') #2nd subplot title
ax1.grid()
ax2.grid()

fig.suptitle('Main title',ha='center',va='bottom')
#fig.tight_layout()
plt.show()

Everything is working fine except that there's a unwanted huge gap between the main plot-title and the 2 subplots as shown

Just by deleting this row:

plt.suptitle('Water Vapor Count for Fani before landfall') #Overall plot title.

and modified this row:

fig.suptitle('Main title',ha='center',va='bottom')

to:

fig.suptitle('Water Vapor Count for Fani before landfall')