Temple of Storms is a mysterious temple located in the Storm Peaks within Northrend. It was titan-made. It is similar to Wyrmrest Temple down in the Dragonblight. This temple sits on one of the tallest peaks, right along the western border, so just beyond it the cliffs drop to Icecrown Glacier. A wide path, one of the only straight channels in this region, leads to massive stone steps that stop at the temple’s front door. Crystal golems stand guard at the perimeter, barring access. Shapes can be seen moving around within: massive shapes, too big to be anything but storm giants. The titans must have built this, but its unknown if it was for themselves or for the giants.
Either way, the titans have long since vanished and the giants claim this temple as their own. Occasionally lightning can be seen flickering from the dome — not down to it but up from it — perhaps they’re doing something more than worship in there.
(Meteorological explanation: Lightning occurs because of a difference in charge between a storm and the ground. The storm cloud acts as the negative force while at the Temple of Storm's spire, a positive charge gained from a stepped ladder gathers energy that is released into the sky; thus the appearance of lightning firing into the sky. Nothing "unusual" here. Because energy always flows from negative charge to positive charge, the event described in the materials requires the cloud to have an excess positive charge and the temple itself an excess negative charge. This is a rare event, but does happen in the real world.)
In World of Warcraft
This section concerns content exclusive to Wrath of the Lich King.
Temple of Storms is located atop the highest mountain in the Storm Peaks (and therefore all of Northrend), and is the sanctum of Keeper Thorim, the Stormlord .He sat brooding here for some time after the death of his wife Sif at the hands of his treacherous brother Loken. After  , the throne of Thorim is empty, as Thorim is now located somewhere within Ulduar.
This section concerns content exclusive to Cataclysm.
As of the expansion, Thorim can again be seen atop the mountain inside the temple, this time standing tall in front of his throne.