* New storm forces pope to cut short trip to typhoon area
* Makes emotional impromptu remarks to typhoon survivors
* Storm a reminder of deadly typhoon Haiyan (Recasts throughout with new storm cuts trip short, airport closed, quotes)
By Philip Pullella and Manuel Mogato
TACLOBAN, Philippines, Jan 17 (Reuters) - Pope Francis, wearing a plastic poncho against gusting winds and driving rain, kept a promise on Saturday to comfort survivors of a devastating 2013 typhoon but a new storm forced him to leave early.
The pope flew to Tacloban, ground zero of Typhoon Haiyan, which devastated the area around Leyte Island 14 months ago, killing at least 6,300 people, leaving a million others homeless and displacing four million.
The strong wind blew the white skull cap from Francis' head and rippled his white cassock as he disembarked from his plane. He donned the same type of yellow, transparent poncho worn by the hundreds of thousands of people in the area as tropical storm Mekkhala hit, with wind gusts of up to 130 km/h (80 mph).
At a Mass near the airport, he put aside his prepared homily and delivered a very personal, emotional message of comfort to survivors, who stood amid puddles in mud-soaked fields and along roadsides.
He told them that he had vowed to make the trip in November 2013 when he saw reports of the devastation Haiyan had caused.
"I felt that I had to be here ... I am here to be with you, perhaps a little late, I have to say, but I am here," he said.
The Pope, speaking through an interpreter who translated his comments into English from his native Spanish, said he "respected the feelings" of those who felt they had been let down by God because of the disaster but implored them to move forward in their faith.
"Many of you have asked the Lord, 'Why?' And to each of you the Lord is responding to your hearts from his heart ... so many of you have lost everything. I don't know what to say to you but the Lord does know what to say to you," he said.
Nearly 3,000 victims are buried in the city's almost half-hectare mass grave site. Hundreds are still unaccounted for.
He asked the crowd to hold a moment of silence and thanked those who helped in the rescue effort after the worst recorded storm ever to make landfall.
"This is what comes from my heart and forgive me if I have no other words to express," Francis said.
"PIERCED MY HEART"
"What he said pierced my heart," said Maria Alda Panahustad. "My house was destroyed by (Haiyan) and again by Ruby," she said, referring to another storm that hit the central Philippines last month, killing 27 people..
The papal Mass was accelerated and the remainder of the program - a visit to a nearby cathedral, lunch with survivors and the blessing of a new center for the poor - was compacted so he could leave four hours early because of worsening conditions.
In the cathedral, he apologized for leaving early. "I'm sad about this, truly saddened," he said.
The Vatican said he blessed the center from his car. He also stopped briefly at the home of a poor fisherman on his way into Tacloban city after the Mass.
Minutes after the Pope's plane left for Manila, a jet carrying 11 people, including Philippine Cabinet members, overshot the runway at Tacloban because of the storm. No one was hurt but authorities closed the airport.
A 21-year-old volunteer was killed when a scaffolding holding huge speakers was blown over by the wind, Leyte health officials said.
Saturday's storm was an eerie reminder of Haiyan, which hit the same area with 250 kph (155 mph) winds and created a seven-meter high storm surge, wiping out almost everything in its path when it swept ashore on Nov. 8, 2013.
Haiyan destroyed about 90 percent of Tacloban city, 650 km (400 miles) southeast of Manila. More than 14.5 million people were affected in six regions and 44 provinces.
The government estimates it needs almost 170 billion pesos ($3.8 billion) to rebuild the affected communities, including the construction of a four-meter high dike along the 27-km (17 miles) coastline to prevent a repeat of the disaster. (Additional reporting by Neil Jerome Morales, Enrico dela Cruz and Rosemarie Francisco in Manila; Editing by Paul Tait)