  We report multiple epoch VLA/JVLA observations of 89 northern hemisphere
sources, most with 37\,GHz flux density > 1 Jy, observed at 4.8, 8.5, 33.5, and
43.3 GHz. The high frequency selection leads to a predominantly flat spectrum
sample, with 85% of our sources being in the Planck Early Release Compact
Source Catalog (ERCSC). These observations allow us to: 1) validate Planck's 30
and 44 GHz flux density scale, 2) extend the radio SEDs of Planck sources to
lower frequencies allowing for the full 5-857GHz regime to be studied, and 3)
characterize the variability of these sources. At 30 GHz and 44 GHz, the JVLA
and Planck flux densities agree to within 3%. On timescales of less than two
months the median variability of our sources is 2%. On timescales of about a
year the median variability increases to 14%. Using the WMAP 7-year data, the
30 GHz median variability on a 1-6 years timescale is 16%.
