A method comprising: receiving, by a processor of a weather system, first weather information generated by a first source comprising an onboard radar system of an aircraft; receiving, by the processor, second weather information generated by a second source different from the first source, wherein the second source comprises a device external to the aircraft; determining, by the processor, a first reliability index for the first weather information; determining, by the processor, a second reliability index for the second weather information; combining, by the processor, the first weather information and the second weather information to determine combined weather information; and for at least one voxel of a plurality of voxels of a volumetric buffer: determining, by the processor and based at least in part on the combined weather information, a weather product for the respective voxel; determining, by the processor and based at least in part on the weather product, the combined weather information, the first reliability index and the second reliability index a combined reliability index for the weather product, the combined reliability index indicating a degree of confidence that one or more characteristics of the weather product are accurate; and outputting, by the processor and for display at a display device, a first visual representation of the weather product and a second visual representation of the combined reliability index for the weather product. receiving, by a processor of a weather system, first weather information generated by a first source comprising an onboard radar system of an aircraft; receiving, by the processor, second weather information generated by a second source different from the first source, wherein the second source comprises a device external to the aircraft; determining, by the processor, a first reliability index for the first weather information; determining, by the processor, a second reliability index for the second weather information; combining, by the processor, the first weather information and the second weather information to determine combined weather information; and for at least one voxel of a plurality of voxels of a volumetric buffer: determining, by the processor and based at least in part on the combined weather information, a weather product for the respective voxel; determining, by the processor and based at least in part on the weather product, the combined weather information, the first reliability index and the second reliability index a combined reliability index for the weather product, the combined reliability index indicating a degree of confidence that one or more characteristics of the weather product are accurate; and outputting, by the processor and for display at a display device, a first visual representation of the weather product and a second visual representation of the combined reliability index for the weather product. determining, by the processor and based at least in part on the combined weather information, a weather product for the respective voxel; determining, by the processor and based at least in part on the weather product, the combined weather information, the first reliability index and the second reliability index a combined reliability index for the weather product, the combined reliability index indicating a degree of confidence that one or more characteristics of the weather product are accurate; and outputting, by the processor and for display at a display device, a first visual representation of the weather product and a second visual representation of the combined reliability index for the weather product.