Do ex-hurricanes ever reach Europe frontless, with predominantly convective rainfall?

[Summer8906]

I've noticed that in general, ex-hurricanes usually develop fronts by the time they reach Europe, presumably due to engaging with cold polar air. For example, ex-Kirk has a frontal structure shown on maps.

However are there any cases when the ex-hurricanes fail to engage colder air? For example might their extratropical successors, on occasion, drift through fairly stagnant and warm air in the Atlantic and reach Europe frontless, as a result of failing to engage cold air?

In these cases might the rainfall patterns remain predominantly convective, consisting of a mix of showers and remnant circular areas of organised rainfall, even though the system is extra-tropical?

I can't recall such systems though perhaps they existed. i do remember ex-Ophelia produced no rainfall at all (as well as the red skies) here.

[Snowspout]

No. As soon as depressions leave the tropics, frontogenesis starts because circulation of air inevitably results in temperature boundaries when different airmasses are tapped into. Even if they aren't explicitly marked and obvious on charts. In centuries of warming this could change, but not anytime soon.

However there are a few sidenotes, namely that cyclones without fronts have and do occur in Europe but they aren't hurricanes but rather polar lows. Most polar lows form at such high latitudes that their wind radius does not extend sufficiently south enough to tap into a warmer airmass outside of the PV and subsequently do not create any horizontal temperature contrasts, Northern Norway and Svalbard are the European targets here. Just like tropical cyclones they have a smaller but more intense(?) windfield and their snowfall is primarily convective (above freezing SST's into frigid PV 850's).

And finally hurricane precipitation isn't all convective, its worth noting the eyewall is made up of primarily high PWAT but more stratiform precipitation because the convective energy is distributed over a larger area into an organized cyclone, therefore unlike individual convective cells they may not reach high enough into the freezing level to develop a mixed-phase (ice and supercooled water) region that characterises CB's and even then the vertical charge separation required for lightning is now a mainly horizontal flow instead following the general synoptic wind pattern of the cyclone. This is why the eye wall does not produce much lightning, obviously there will be embedded CB's but this isn't good for the storm as it implies entrained drier air aloft allowing for enhanced localized instability but at the expense of radiative cooling. As you will know any cooling near the eyewall reduces its strength.

Edited Tuesday at 23:37 by Snowspout
Removed inaccuracy