"This is an unprecedented situation and we are doing the best we can under the circumstances. Please do not panic, we will reach you, I promise," he said on Twitter.
Omar asked the people, who were sending distress calls to him on the micro-blogging site, to stay in the upper storeys of the buildings and wait for the help to come.
"All of you tweeting for help/rescue, we are doing our best to reach all ASAP. Please stay in the upper floors and wait for the help to come," he said.
"I have spoken to cabinet secretary heading crisis management team in Delhi to direct airlifting of boats to Srinagar urgently via NDMC and army, being done," Omar tweeted.
"Also asked cabinet secretary to direct air force to use helicopters to evacuate people mostly in danger, copters are on standby and will be used," he said.
Jammu and Kashmir is reeling under worst floods in nearly six decades with 138 people dead and thousands displaced.