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Large-amplitude accretion outbursts in young stars are expected to play acentral role in proto-stellar assembly. Yet most outburst identifications anddetailed studies have resulted from searches in optical time domain surveys,which are not sensitive to events located in heavily dust-obscured regions ofthe Galactic plane. Here, we present the discovery of WTP$\,$10aaauow, alarge-amplitude mid-infrared (MIR) outburst identified in a systematic searchof NEOWISE data using image subtraction techniques designed to recovertransients in dense Galactic stellar fields. The new outburst is locatedtowards the RCW$\,$49 star-forming region, and estimated to be at a distance of$\approx 4\,$kpc. Concurrent with the MIR brightening, we show that the sourceunderwent a $\gtrsim5\,$mag outburst in the optical and near-infrared (NIR)bands around 2014-2015 reaching a peak luminosity of $\approx260\,$L$_\odot$,followed by a slow decline over the next 7 years. Analysis of the pre- andpost-outburst spectral energy distributions reveal a pre-outburst stellarphotosphere at a temperature of $3600-4400\,$K, surrounded by a likelytwo-component dust structure similar to that of a flat spectrum or Class I typeYSO. We present optical and NIR follow-up spectroscopy of the source, that showa GK-type spectrum in the optical bands exhibiting complex line profiles instrong absorption features, and evidence for a wind reaching a terminalvelocity of $\approx 400\,$km$\,$s$^{-1}$. The NIR bands are characterized by acooler M-type spectrum exhibiting a forest of atomic and molecular features.All together, the spectra demonstrate that WTP\,10aaauow is a new FU Orioutburst. Ongoing systematic infrared searches will continue to reveal theextent of this population in the Galactic disk.

WTP$\,$10aaauow: Discovery of a new FU Ori outburst towards the RCW$\,$49 star-forming region in NEOWISE data