It is not useful to look at exact number for weather forecast. This is why there is the feeling of coin flipping. That the models go back and forth for exact min pressure at the nearest hPa or max surface wind at the nearest km/h is normal and should not be confusing the forecast. Models are still a bit unsure about the deepening of the low, but in any way and in any case, a wave in the frontal boundary from the complex low linked to ex Kyle, now storm Ellen, is going to deepen. The details of the exact minimum pressure and of which exact wave in the front and of the exact km/h of the max wind and so on are not really relevant. We can be 100% that a low is going to deepen from a wave in this complex, and that it is going to be a wild ride for the Atlantic side. And the ranges of some physical parameters are not going to evolve in the coming days. Precipitable water is forecasted to reached 25 - 30 millimeters in the warm air advection and this is not going to change, strong winds of 30 - 35 kts are also a sure thing, I am ready to bet on thunderstorms northward of the 80°N also, etc... That the low go to the 970s or stall in the bottom of the 980s hPa or that lightning strike will be here or there is asking too much, and is not really the biggest question. The difference between a 980 hPa low with 34 kts of wind and 29 mm / 24 h of rain at max, which develops from this wave, or a 975 hPa low with 36 kt of wind and 31 mm /24 h at max which develops from that wave, is not significant. Weather forecasting is not reading model outputs and going back and forth with them. This is going to be a significant event for the Atlantic side, with the injection of tropical moisture from Kyle, and with implications for planetary rossby waves train, no matter the exact unit of this or that parameter.