under the influence of an active southwest monsoon surge, a low pressure area formed over the arabian sea on june 9. it slowly organized, and was classified tropical storm "02a" by the jtwc in the early hours of june 10. in the following hours, the imd upgraded the storm to a depression and subsequently a deep depression, designating it "arb 01". on june 11, the system was upgraded to cyclonic storm intensity and was named "nanauk" by the imd as it continued to intensify under favorable environmental conditions. the following day, nanauk reached its peak intensity with a minimum central pressure of and 3-minute sustained winds of . as it tracked further northwestwards, the storm encountered moderate vertical wind shear, dry air and low sea surface temperatures, causing it to weaken rapidly into a depression on june 13. a low-level steering flow deflected the storm to take a northward path, and the system was last noted as a well-marked low pressure area on june 14.