Greenland Ice Melt

NASA image: White areas shows area of ice cover, pink areas
show definite melt (dark pink) and probably melt (light pink)

According to NASA (as linked by numerous sources), between July 8 and July 12 the ice melt on Greenland went from approximately 40% of the surface area to likely over 95% of the surface area. According to NASA's release:

Researchers have not yet determined whether this extensive melt event will affect the overall volume of ice loss this summer and contribute to sea level rise.

"The Greenland ice sheet is a vast area with a varied history of change. This event, combined with other natural but uncommon phenomena, such as the large calving event last week on Petermann Glacier, are part of a complex story... ."
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This extreme melt event coincided with an unusually strong ridge of warm air, or a heat dome, over Greenland. The ridge was one of a series that has dominated Greenland's weather since the end of May.
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"Ice cores from Summit show that melting events of this type occur about once every 150 years on average. With the last one happening in 1889, this event is right on time ... ."

(Internal quotes from Tom Wagner of NASA and Lora Koenig of Goddard.)