HAV's in convective activity.
Modern weather radar installed in the new hybrid air vehicles will do a lot to negate any risks from downbursts when combined with ground and satellite based weather radar systems for the bigger picture. The Germans never lost a big Zeppelin making numerous croosings of the ITCZ (Inter tropical convergence zone) which having crossed it heading for Brazil in a yacht and flying around Trinidad, is one very bad place for severe thunderstorms.
The modern hybrid air vehicles like the LEMV (HAV 304) are much more powerful with their high tech German diesels and when combined with the lifting body shape they can start a sudden climb or descent in a much more decisive way than an old Zeppelin. They do not fly like an airship as they have both more power available and a flying wing shape that will enable them to deal very effectively with up or down draughts, although they are much safer in severe turbulence because you can not loose control of one, as they have positive stability factors from pendulous stability, so can't be tipped over in flight. If an active tropical storms or tornadoes are avoided they are very safe and the long endurance of such diesel engined HAV's means they will have the reserves at destination to hold clear for days if required. Not quite the situation of the Air France Airbus they are fishing up at present in terms of ultimate safety.
Regards JB (Airship & Blimp Consultant)