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There is nothing special about these summits other than the close access to cities and low elevation, making them a good early season, or low snow year walk. As you hike/bike to the locations, there are 2 former lookout sites to explore. Peak 4640 has 480 feet of prominence to count as a mountain. As for Weather Station Knob, it does not meet the 400 foot prominence threshold but it does have some history. There are remnants of a weather station near the summit. Sometime in the 1970s (I think), two hunters sought refuge inside the structure to avoid some bad weather. Both died from carbon monoxide poisoning from a stove. The structure was demolished after this incident (or so the story goes, not sure on exact facts).
SW Pierce Hikes
Washington Hiking
Elevation 4,640 feet to 4640
Distance: 8.8 miles to peak 4640, 1.5 more for weather station site
Elevation Gain: 2,600 feet
Prominence: 480 feet
Access Road: Good gravel road.

Peak 4640 and Weather Station Knob

The road up is a nice grade. Hike or bike using the map provided. Peak 4640 has good views from just below the summit from old logging landings on both the south and east side (go to end of summit road). Weather Station Knob itself affords some views but the highest point on both peaks is forested.
Route
Find your way to Wilkeson. In town, turn left on Railroad Avenue passing the school and coke ovens. When you hit the Sunset Lake Camp sign, turn right on a gravel road. This is FS 7710. Follow this 4.3 miles to a Y, go right and in 0.2 miles is a gate. Park in areas below the gate. Some have suggested a sign says to stay out but it may have been during a logging operation. A smaller timber company owns the first several miles of the road.
Access
wilikson map carbon map Anchor Burnt Mountain Carbon Ridge cascades footing basin logging logging Metal Pipe summit Puget Sound station Old Baldy Mountain Burnt Mountain cable
Weather Station Knob
Puget Sound
Active logging on road
Looking north into the Puget Sound region
Carbon Ridge and Pitcher Peak
Burnt Mountain
Looking NW toward the north summit of The Three Sisters
East viewpoint near the summit of peak 4640
Lake with no name below the knob
Ridge going to Burnt Mountain
Long treated power pole on the ground
Footing, anchor and wire
Anchor bolt
Pipe in the ground
Cut ground cable and antenna base
Metal parts
Old Baldy Mountain