The rapid return of inflationary tilt and strong glow from both Halemaʻumaʻu eruptive vents indicates that another lava fountaining episode is likely. The presence of strong glow and flames from the south vent along with a few small spatter events from the north vent overnight indicate magma is standing high in the vent system. Both the UWD and SMC tiltmeters have recovered to within a microradian of the deflation during episode 46. The forecast window for episode 47 is based on data from summit tiltmeters and assumes similar inflationary patterns as prior to episode 45 and 46. These and seismic velocity data suggest that lava fountaining will most likely occur sometime between later today, Tuesday, May 12, and Wednesday, May 13, with Thursday, May 14, less likely. The forecast window may be adjusted based on changes observed at summit tiltmeters and seismic instruments.