The Wenatchee World



The latest extended forecast from The Weather Channel

Remove this weather forecast


Lo42° Chance Showers then Rain


Hi54° Rain then Chance Rain

Wednesday Night

Lo38° Slight Chance Rain then Mostly Cloudy


Hi55° Mostly Sunny

Thursday Night

Lo35° Mostly Clear


Hi58° Sunny

Friday Night

Lo38° Mostly Cloudy


Hi56° Partly Sunny

Saturday Night

Lo37° Partly Cloudy


Hi54° Partly Sunny

Final report: No cause but three possibilities

Send to Kindle
Print This

While federal investigators never determined the cause of the 1974 Apple Yard explosion, a 1975 report from the National Transportation Safety Board notes three possibilities:

  • A railcar coupler separation process that penetrated the tank holding monomethylamine nitrate.
  • Cavities created in the metal skin of the tank, followed by recompression within the monomethylamine nitrate.
  • Compression of an air bubble encapsulated in the monomethylamine nitrate or trapped in the air space at the top of the tank.

Monomethylamine nitrate is…

View my options or Sign in