Due to our late spring, it has been a very slow start to the thunderstorm season across southern Manitoba. We are now May 25, and we have yet to receive a single thunderstorm in Winnipeg. In addition, across all of southern Manitoba, only 7 thunderstorm days have occured so far.
In Winnipeg, the beginning of our thunderstorm season this year is already a month behind. The 1981-2010 normal date to get our first thunderstorm is April 26!
As of today, May 25, we have already reached 5th latest start to the thunderstorm season on record. Only 3 times since 1953 have we not received our first storm until June (1958, 1992 and 1995). (Note: this was determined with data from the airport only, therefore this is not representative of southern Manitoba as a whole). We'll have to wait and see in the next few days if we can manage to break this curse and not have to wait until June. It's a depressing thought!
Here's a graph illustrating the beginning of the thunderstorm season in Winnipeg per year since 1953. The years that I added are the top 5 latest and top 5 earliest.
Today also marks the 274th consecutive day without a thunderstorm. So far, this is the second longest ''thunderstorm drought''. We will need to have no storms for the next 12 days to at least tie for longest:
I'll update all these stats in the May summary next Saturday - that is if we manage to get a storm before then!
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An important note on where I got all these stats:
From 1953-1972 and 1978-1981 I used Environment Canada hourly data from Winnipeg Int'l... As a result, in this period the data is not as precise. This is because a storm may have occured in between hourly observations that got missed.
From 1973-1977 and 1982-present I used a METAR archive courtesy of wunderground. This ensures that no thunderstorm was missed in this period because this archive includes observations in between hourly observations. And yes, I was watchful of potentially erroneous obs and I did have to eliminate a couple that I found were erroneous.