First, I checked back into my CoCoRaHS data since 4/07. I haven't been keeping track of days with thunder until this year, so my data consists of comparisons with my comments and those of other observers in Callaway and Boone counties.
- 2007: 4
- 2008: 7
- 2009: 1 (so far)
It is easy to see that 2008 was an active year. I don't remember it being especially stormy, but apparently it was compared to this year. I've only heard thunder once this month so far, and it was from a small cell that passed to our north one night a couple of weeks ago.
2007 was the year of the damaging freeze through the nation's mid-section, and Missouri was not spared from it. The National Weather Service compiled a comprehensive study into the meteorological conditions, and agricultural and horticultural impacts. If you've got some time to read the 52 page study, brew some coffee, sit down and enjoy.
I was interested to find any data on severe weather events in Missouri that normally occur in April. That prompted me to dig into the NWS site for data, and I am amazed by the amount of information that they provide for the public. I seem to find something new every time I look around their site. All data comes from the Storm Prediction Center.
Number of Severe Weather Reports in Missouri (Tornado, High Wind, Hail)
For more information, including locations and divisions of each severe weather event, click on the links provided.
- 2000: 165
- 2001: 296
- 2002: 196
- 2003: 350
- 2004: 70
- 2005: 170
- 2006: 484
- 2007: 197
- 2008: 163
- 2009: 70
What an amazing contrast between 2004 and 2006! The predominant severe weather report seems to be hail. It should be noted that the hail criteria has changed this year to 1", in contrast with the previous size of .75". This will cause this year's severe hail reports to decline somewhat, but it seems as April, 2009 looks to be similar to 2004 with the reports predominantly located in southern Missouri. Of course, history shows us that one severe outbreak can increase this year's number, even double it!