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We report the outbursting source PTF 14jg, which prior to the onset of itslate 2013 eruption, was a faint, unstudied, and virtually uncatalogued star.The salient features of the PTF 14jg outburst are: (i) projected location nearthe W4 HII region and radial velocity consistent with physical association;(ii) a lightcurve that underwent a $\sim$6-7 mag optical (R-band) throughmid-infrared (L-band) brightening on a few month time scale, that peaked andthen faded by $\sim$3 mag, but plateaued still $>$3.5 mag above quiescence by$\sim$8 months post-peak, lasting to at least five years after eruption; (iii)strong outflow signatures, with velocities reaching -530 km/s; (iv) a lowgravity and broad ($\sim$100-150 km/s FWHM) optical absorption line spectrumthat systematically changes its spectral type with wavelength; (v) lithium; and(vi) ultraviolet and infrared excess. We tentatively identify the outburst asexhibiting characteristics of a young star FU Ori event. However, the burstwould be unusually hot, with an absorption spectrum exhibiting high-excitation($\sim$11,000-15,000 K) lines in the optical, and no evidence of CO in thenear-infrared, in addition to exhibiting an unusual lightcurve. We thus alsoconsider alternative scenarios including various forms of novae, nuclearburning instabilities, massive star events, and mergers -- finding them allinferior to the atypically hot FU Ori star classification. The sourceeventually may be interpreted as a new category of young star outburst withlarger amplitude and shorter rise time than most FU Ori-like events. Continuedmonitoring of the lightcurve and spectral evolution will reveal its truenature.

PTF 14jg: The Remarkable Outburst and Post-Burst Evolution of a Previously Anonymous Galactic Star