all genera as high (cirro-, cirrus), middle (alto-), multi-level (nimbo-, cumulo-, cumulus), and low (strato-, stratus). These groupings are determined by...

medical officer from RAE Farnborough, reports that the bomber entered a cumulo-nimbus cloud at 33,000 feet (10,000 m), became heavily iced-up with hailstones...

medical officer from RAE Farnborough, reports that the bomber entered a cumulo-nimbus cloud at 33,000 feet (10,100 m), became heavily iced-up with hailstones...