After multiple warm winters and a few false starts during this cold one, the Seattle metro area finally got a substantial amount of snow Sunday night. Nearly a foot has fallen in places like Bonney Lake, with 2-3 inches here in Seattle. Metro is reporting numerous cancellations and serious delays throughout the system this morning, and buses are running with chains and on snow routes. Thought there is method behind the appearance of madness, riders are often left bewildered by the snow-related changes, so we thought it would be a good time to repost our Snow Route Refresher from December. Here’s the relevant section:

It’s a good time to refresh your knowledge of transit snow operations in Seattle. The first thing you should do is sign up for alerts. Metro, Sound Transit, Community Transit, Pierce Transit, and WSDOT all provide thorough information on road closures and reroutes. Being a Twitter user often gives you a leg up too; follow @seattledot, @kcmetrobus, @SoundTransit, @MyCommTrans, @PierceTransit, and @wsdot_traffic.

In major Seattle snow events, there are a few basic reroute principles:

First Hill: no service west of Broadway. Trolley routes such as #2/3/4/12 detour all the way down to the International District.

no service west of Broadway. Trolley routes such as #2/3/4/12 detour all the way down to the International District. Queen Anne: No routes travel up the Counterbalance, with routes 2/13 getting a tour of Kinnear/10th Ave W along the way instead.

No routes travel up the Counterbalance, with routes 2/13 getting a tour of Kinnear/10th Ave W along the way instead. Capitol Hill/Central District: Route 8 is basically an entirely different route, using 8th, 9th, Pine, and Union between South Lake Union and the Central District. Route 11 skips the steepest part of Madison east of 23rd. Routes 10, 48, and 49 operate normally.

Route 8 is basically an entirely different route, using 8th, 9th, Pine, and Union between South Lake Union and the Central District. Route 11 skips the steepest part of Madison east of 23rd. Routes 10, 48, and 49 operate normally. SE Seattle : Link usually hums along normally, and Route 7 runs normally except skipping the Prentice Loop. Routes 106 and 107 skip Skyway, staying along Lake Washington between Renton and Rainier Beach.

: Link usually hums along normally, and Route 7 runs normally except skipping the Prentice Loop. Routes 106 and 107 skip Skyway, staying along Lake Washington between Renton and Rainier Beach. NE Seattle : No service on NE 65th street east of 35th Ave NE. There is a convoluted shuttle system for Wedgwood and Ravenna, and new routes such as Route 62 detour all the way to UW Station.

: No service on NE 65th street east of 35th Ave NE. There is a convoluted shuttle system for Wedgwood and Ravenna, and new routes such as Route 62 detour all the way to UW Station. West Seattle: All routes skip the Viaduct and the high bridge, using 1st/4th and the Spokane Street Bridge instead.

All routes skip the Viaduct and the high bridge, using 1st/4th and the Spokane Street Bridge instead. NW Seattle: The least disrupted area in Seattle, most routes operate normally. Exceptions include Route 5 (no Fremont Ave) and Route 26 (no NE 40th St).

In 2010’s Snowmageddon, Link was the only mode that didn’t fail, With the ULink extension, Capitol Hill and UW riders can now join the ranks of the snow-immunized.