  We present observations of Uranus in northern spring with the VLA from 0.7 cm
to 5 cm. These observations reveal details in thermal emission from Uranus'
north pole at 10s of bars, including a dark collar near 80N and a bright spot
at the polar center. The bright central spot resembles observations of polar
emission on Saturn and Neptune at shallower pressures. We constrain the
variations in temperature and NH3/H2S abundances which could explain these
features. We find that the brightness temperature of the polar spot can be
recreated through 5 K temperature gradients and/or 10x depletion of NH3 or H2S
vapor between 10-20 bars, both consistent with the presence of a cyclonic polar
vortex. The contrast of the polar spot may have increased since 2015, which
would suggest seasonal evolution of Uranus' polar circulation at depth.
