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ZLA LOS ANGELES (ARTCC)PALMDALE, CA. A2910/12 - QRACA W291 ACT, EAST OF 121 DEGREES WEST LONGITUDE AND NORTH OF 30.5 DEGREES NORTH LATITUDE. THIS MAY NOT BE THE ONLY AIRSPACE ACTIVATION WITHIN W291. OPERATIORS ARE ADVISED THAT ADDITIONAL NOTAMS MIGHT EXIST FOR CLOSURE OF OTHER PORTIONS OF W291. SFC - FL800, 21 DEC 14:30 2012 UNTIL 22 DEC 02:00 2012. CREATED: 17 DEC 23:33 2012
Boom Sounds / Flashes Of Light In Sky - Hydrogen sulfide and/or methane plumes detonating in the sky above us, either purposely via human action (using incendiary flares or whatever), or igniting due to lightning. This may also sound like fireworks or 'popping sounds' if the plumes are smallish.