A timeline created and written by Alternate History Geek; it was started at the beginning of October 2014, and is still ongoing as of February 2015. Read it here!
It now has a TVTropes page, too (link is here).
The timeline's main POD is that 2010's Hurricane Igor, a storm that in OTL affected only Bermuda and Newfoundland and only at Category 1 intensity, strengthens to a Category 5 hurricane, passes directly over Bermuda at that intensity (devastating the island group), and then goes on to hit New England, Atlantic Canada, and eventually the British Isles and western Norway. The devastation of the northeastern United States and Atlantic Canada causes landslide victories for the Democrats in the US and the New Democrats and Liberals in Canada, as well as outpourings of sympathy from across the globe and, most crucially, the early withdrawal of US troops from Iraq and Afghanistan. This last factor causes the entire region to descend into chaos soon afterwards, aided and abetted by Pakistan falling into a nuclear civil war and several smallpox-laden rockets being fired into Israel…
3. Category 5
4. Igor STRONK
9: New Atlantis
10: Oh Crap
Interlude 1: Presidential Address (by Unknown)
11: WHAM
12: Out to Sea
13: Damage Control
14: Donegal Express
16: Euro-TCWO
18: DIE CONSERVATIVE PARTY DIE
19: Sideswiped
21: New Season Started, Old Season Still Going
22: Action Reaction
24: Justice At Last
25: We Are NOT Screwing Up Again
28: Ebola Ho!
30: Vaccinate Or Die
32: The Great Connecticut President Shoot
33: Take Me Out to the Ballgame (by packmanwiscy)
35: Burn Syriaq Burn
36: Stuff Blowing Up
39: Counterstrikes
40: Oh No, You Don't
41: The Grim Reaper
Interlude 2: 438121 Arisia
43: Cops, Killers, Cop Killers
44: Crime Never Pays
Interlude 3: Massachusite Gubernatorial Address (by Unknown)
45: Tit for Tat
46: One People, One Country, Ten Nukings
48: 2012 Elections Pt. 1: Upset