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April Severe Weather Climo


wisconsinwx

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Very true, and perhaps his expectations as well.  April is rarely notable for severe in the Lakes, it takes until Mid May usually before we can regularly expect warm fronts to make it past I80.

I can think of several instances off the top of my head that would disagree.  We may not get regular MCSs through here in April, but some of the deadliest tornado outbreaks in this part of the country have happened in April.

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I can think of several instances off the top of my head that would disagree.  We may not get regular MCSs through here in April, but some of the deadliest tornado outbreaks in this part of the country have happened in April.

 

 

Agreed...the consistency/frequency is not there in April but the ceiling is pretty high. 

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I can think of several instances off the top of my head that would disagree.  We may not get regular MCSs through here in April, but some of the deadliest tornado outbreaks in this part of the country have happened in April.

 

Sure we can get the occasional outbreak (Palm Sunday 2011 is one I'm sure you're thinking of) but again I'm talking by and large, and the frequency is certainly much less than May through July or August per month averages.

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Sure we can get the occasional outbreak (Palm Sunday 2011 is one I'm sure you're thinking of) but again I'm talking by and large, and the frequency is certainly much less than May through July or August per month averages.

 

You mean April 11th, 1965.

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Sure we can get the occasional outbreak (Palm Sunday 2011 is one I'm sure you're thinking of) but again I'm talking by and large, and the frequency is certainly much less than May through July or August per month averages.

That was just one of many, others have posted dates as well of tornado outbreaks in this region in April. Maybe you should buff up on your climatology a bit.

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That was just one of many, others have posted dates as well of tornado outbreaks in this region in April. Maybe you should buff up on your climatology a bit.

 

F/EF3-F/EF5 tornadoes in the region for the months of January-April since 1950 (that's 172 in 63 years):

 

post-384-0-97459800-1398255653_thumb.jpg

 

The number jumps to 558 if you include F/EF2s.

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You mean April 11th, 1965.

 

No, April 10, 2011.  You guys are too busy trying to tear me apart though to get your climo and dates right, either.  A large majority of those dangerous tornadoes are south of the Great Lakes, in landlocked areas of Indiana and Illinois.  The dwindling tornado probs for mid to late April posted above paint a more realistic picture that once you get into Jonger and my neck of the woods, April is much less likely to yield frequent severe weather.

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No, April 10, 2011.  You guys are too busy trying to tear me apart though to get your climo and dates right, either.  A large majority of those dangerous tornadoes are south of the Great Lakes, in landlocked areas of Indiana and Illinois.  The dwindling tornado probs for mid to late April posted above paint a more realistic picture that once you get into Jonger and my neck of the woods, April is much less likely to yield frequent severe weather.

lol

 

Oh, and that wasn't an "outbreak". Nice try though.

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No, April 10, 2011.  You guys are too busy trying to tear me apart though to get your climo and dates right, either.  A large majority of those dangerous tornadoes are south of the Great Lakes, in landlocked areas of Indiana and Illinois.  The dwindling tornado probs for mid to late April posted above paint a more realistic picture that once you get into Jonger and my neck of the woods, April is much less likely to yield frequent severe weather.

 

Oh come on, you can't say that after you didn't specify in your original post.

 

Also April 17th was Palm Sunday in 2011 so checkmate.

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Oh come on, you can't say that after you didn't specify in your original post.

 

Also April 17th was Palm Sunday in 2011 so checkmate.

 

My mistake on the Palm Sunday reference, you are right.  Joe, how does 15 tornadoes in April in Wisconsin not constitute an 'outbreak'?

 

http://www.crh.noaa.gov/grb/?n=110410_tornadoes

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My mistake on the Palm Sunday reference, you are right.  Joe, how does 15 tornadoes in April in Wisconsin not constitute an 'outbreak'?

 

http://www.crh.noaa.gov/grb/?n=110410_tornadoes

 

Outbreak or not, the fact that there were that many tornadoes there is just proving the counterpoint to Jonger, that severe weather is frequent in April. I mean we can bring up year after year of outbreaks in this part of the world in April, so to say severe weather isn't frequent in April is pretty dumb. Using a localized area of your location or his isn't proving the argument because severe weather is isolated by nature so it isn't going to hit every locale the same.

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Outbreak or not, the fact that there were that many tornadoes there is just proving the counterpoint to Jonger, that severe weather is frequent in April. I mean we can bring up year after year of outbreaks in this part of the world in April, so to say severe weather isn't frequent in April is pretty dumb. Using a localized area of your location or his isn't proving the argument because severe weather is isolated by nature so it isn't going to hit every locale the same.

 

The number of years that feature an outbreak (therefore the frequency on a daily basis) isn't nearly what it is other months, but as you guys have said, the ceiling is pretty high, that I would agree with.

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Going with wisconsinwx's argument that Illinois and Indiana are "landlocked", I restricted my search to just Wisconsin and Michigan tornadoes for the month of April from 1950-2013.  44 out of those 64 Aprils had at least one tornado somewhere in that area but notice there are a lot of years with only 1 or very few.  Here's the breakdown of tornadoes by date with number of F4/F5 tornadoes noted when applicable.

 

 

4/7/1954:  5

4/15/1954:  1

4/26/1954:  2

4/18/1955:  4

4/3/1956:  6  (2 F4, 1 F5)

4/14/1956:  1

4/19/1957:  6  (1 F4)

4/25/1957:  1

4/27/1957:  1

4/16/1960:  1

4/23/1960:  1

4/24/1960:  1

4/30/1962:  4

4/17/1963:  2

4/28/1964:  1

4/11/1965:  20  (5 F4)

4/1/1966:  1

4/19/1966:  1

4/20/1966:  2

4/14/1967:  2

4/16/1967:  3

4/21/1967:  10  (1 F4)

4/20/1968:  2

4/23/1968:  3

4/9/1969:  1

4/15/1969:  1

4/22/1970:  5

4/29/1970:  2

4/30/1970:  1

4/12/1972:  3

4/1/1973:  1

4/1/1974:  1

4/3/1974:  5

4/12/1974:  4

4/21/1974:  5  (1 F4)

4/17/1975:  1

4/18/1975:  1

4/19/1975:  1

4/15/1976:  2

4/21/1976:  2

4/22/1976:  1

4/2/1977:  7  (2 F4)

4/5/1978:  1

4/11/1978:  2

4/12/1979:  2

4/7/1980:  5

4/8/1980:  1

4/19/1980:  2

4/3/1981:  1

4/4/1981:  2  (1 F4)

4/17/1981:  1

4/12/1982:  1

4/26/1984:  1

4/27/1984:  11  (2 F4)

4/4/1985:  1

4/28/1986:  1

4/1/1987:  1

4/3/1988:  5

4/8/1991:  1

4/23/1991:  1

4/16/1992:  1

4/20/1992:  2

4/24/1993:  2

4/24/1994:  2

4/26/1994:  4

4/12/1996:  1

4/25/1996:  1

4/16/1998:  1

4/11/2001:  2

4/18/2002:  6

4/18/2004:  2

4/26/2007:  1

4/8/2008:  1

4/25/2008:  3

4/26/2009:  1

4/30/2010:  4

4/10/2011:  15

4/26/2011:  1

 

 

 

post-14-0-70971600-1398277205_thumb.png

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Did you even click on the link I displayed in my last post?  If the local office even specified it as an 'outbreak', I think I'll take their word over an amateur meteorologist (myself included).

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15 tornadoes in a state this far north all on one day is an outbreak. Furthermore this isn't going to be another one of those arguments like the event/non event one. Whether or not it holds up to other pinnacle outbreaks that were posted is irrelevant.

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15 tornadoes in a state this far north all on one day is an outbreak. Furthermore this isn't going to be another one of those arguments like the event/non event one. Whether or not it holds up to other pinnacle outbreaks that were posted is irrelevant.

 

 

There's no widely accepted standard as to what constitutes an outbreak as far as I'm aware, but 4/10/11 qualifies imo with 15 in Wisconsin and 4 of them EF2/EF3.  If we want to get cute then perhaps local outbreak would be a better term since it didn't cover a large area.

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There's no widely accepted standard as to what constitutes an outbreak as far as I'm aware, but 4/10/11 qualifies imo with 15 in Wisconsin and 4 of them EF2/EF3.  If we want to get cute then perhaps local outbreak would be a better term since it didn't cover a large area.

Yeah local outbreak would be a good way of putting it, a bit like 7/2/1997 in Michigan but standards change from MI/WI to OK/KS/TX. You can't use the same standard for both areas.

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