A rare occurrence of "thundersnow" occurred in Winnipeg last night as a weather system tracked across Southern MB, bringing the season's first general snowfall mainly north and east of Winnipeg. Around 11:45 pm a band of wet snow was moving through Winnipeg when a sudden flash of lightning generated a very loud thunderclap that some people mistook for an explosion. I was awoken by the thunder myself, and it was as loud as any close by summertime lightning strike, yet it was +1 and snowing at the time. I didn't see the flash, but many people reported one. Data from the lightning detector network indicates that the strike hit somewhere near the Eldridge/Oakdale area of Charleswood and generated 104,000 amps of electricity, which is a very powerful stroke. (normal lightning strikes generate about 20-40,000 amps) Note that this was the only strike recorded last night.. almost like the cloud built up all this static electricity, then released it all at once right over Charleswood! By the way, thunder is very rare around these parts during the cold season, with only 4 official occurrences between November and March in the last 50 years at Winnipeg Airport.