John Valk: _DSC3418
John Valk: _DSC3450
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: test field weather measurement equipment
John Valk: KNMI
John Valk: KNMI
John Valk: test field weather measurement equipment
John Valk: releasing the weather balloon
John Valk: releasing the weather balloon
John Valk: releasing the weather balloon
John Valk: releasing the weather balloon