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Radar Images from Tornado


CT Rain

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0.5º SRV from KENX.

You can see the first time the mesocyclone really appears is at 20:02Z west of Westfield with about 55 knots of gate to gate shear at 5100ft. By the next scan at 20:06Z (10 minutes prior to tornadogenesis) the thing has nearly 130 knots of gate to gate shear. The meso broadens a bit at 2011Z just southwest of Westfield then by the next scane at 20:16Z you have 140 knots of gate to gate shear as tornadogenesis occurs.

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Thanks Ryan. Great captures

How is gate to gate determined?

When you look at an radar image; each pixel is a "gate". When you have two pixels next toeach other with one showing outbound and the other showing inbound that is the gate-to-gate shear and also known as avelocity couplet. You usually add the two numbers together. So, that would mean you could have had a couplet of 79mph towards and 79mph away, or 85mph towards and 73mph away, etc..therefore indicating the gate-to-gate shear within the storm....This works a lot better on Level 2 data than level3.

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When you look at an radar image; each pixel is a "gate". When you have two pixels next toeach other with one showing outbound and the other showing inbound that is the gate-to-gate shear and also known as avelocity couplet. You usually add the two numbers together. So, that would mean you could have had a couplet of 79mph towards and 79mph away, or 85mph towards and 73mph away, etc..therefore indicating the gate-to-gate shear within the storm....This works a lot better on Level 2 data than level3.

Thanks for this explanation. Now I need to learn how to read the colors better. Not used to looking at these. That third to last and last frame in the series CT Rain posted showed it well

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One of the dudes i work with lives in West Springfield. He knows my obsession with weather..It missed his house by 1/4 mile and destroyed his aunt's house and mother's house in Springfield proper. His question to me was why was there no warning for Springfield. He said he called his mother and she had no idea it was OTG and coming towards her. Luckily he told her to get into the basement,

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One of the dudes i work with lives in West Springfield. He knows my obsession with weather..It missed his house by 1/4 mile and destroyed his aunt's house and mother's house in Springfield proper. His question to me was why was there no warning for Springfield. He said he called his mother and she had no idea it was OTG and coming towards her. Luckily he told her to get into the basement,

There is a nine page thread on this with direct input from mets a BOX

http://www.americanwx.com/bb/index.php/topic/19538-late-warning-for-springfield/

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BOX SRV 0.5º. The storm is in range fold for the beginning and emerges from RF almost as soon as tornadogenesis occurs at 2017Z. ENX had a strong and persistent TVS/mesocyclone for 10 minutes prior to the storm emerging from RF on BOX 88d.

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One of the dudes i work with lives in West Springfield. He knows my obsession with weather..It missed his house by 1/4 mile and destroyed his aunt's house and mother's house in Springfield proper. His question to me was why was there no warning for Springfield. He said he called his mother and she had no idea it was OTG and coming towards her. Luckily he told her to get into the basement,

Ask Tip

whistle.gif

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Speaking of debris balls... One of my dogs keeps bringing in pieces of beat up and blackened home insulation from the yard... I'm in Mendon 20 +/- miles from the end of the storms. Mowing the lawns today I saw pieces of "stuff" all over th eplace.

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Speaking of debris balls... One of my dogs keeps bringing in pieces of beat up and blackened home insulation from the yard... I'm in Mendon 20 +/- miles from the end of the storms. Mowing the lawns today I saw pieces of "stuff" all over th eplace.

Yeah, that's sick. Since I have not really followed severe that much until the last coupl eof years, I am always amazed at things like that. And then to read things like from the 1953 tornado, a frozen chunk of a mattress was found in the ocean off Weymouth.... sick

How was it there on June 1?

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I had some free time at work this morning so I figured I'd take a look at some of the files... quite the "radar photogenic" tornado.. at least from the BOX radar site when it gets east of Springfield. CT has already posted the 2d images so I'll share the 3d images I saved.

This is from 2100-2118Z. Keep in mind the lowest scan is still showing ~ 4600ft above the ground in the first scan all the way down to ~ 3400ft in the last scan.. so still relatively high above the surface (this tornado chose a really crappy spot as far as radar sites go :thumbsdown:).

Reflectivity (51dbz +) Looking into the storm from the SE:

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Normalized Rotation (+1.00 +) Same viewing angle as Reflectivity:

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Storm Relative Velocity (33kts +) Looking at the backside of the storm from the west/southwest:

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  • 9 months later...

Pete Banacos from BTV, myself, radarman, and JoeD are just wrapping up a paper on this event. One of the things done was to put this tornado outbreak into a bit of context and rank the top 20 tornado-producing days (since 1950) in New England and easternmost NY by destruction potential index (DPI). This way we have a more objective way to see where this event falls. Quite predictably, 1 Jun 2011 ranks #2 behind the 1953 worcester outbreak. Here is a peek at the top 20.

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Pete Banacos from BTV, myself, radarman, and JoeD are just wrapping up a paper on this event. One of the things done was to put this tornado outbreak into a bit of context and rank the top 20 tornado-producing days (since 1950) in New England and easternmost NY by destruction potential index (DPI). This way we have a more objective way to see where this event falls. Quite predictably, 1 Jun 2011 ranks #2 behind the 1953 worcester outbreak. Here is a peek at the top 20.

Would love to see what you guys come up with. Still in awe of some of those radar images.

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Something similar to a hail spike or three body scatter spike only from debris? Wow, that is crazy. Should be a good read.

That is pretty crazy. I can definitely see the spike on some of the radar images above, and those kinds of things are rare enough for hail events, let alone debris. Can't wait to read up on it.

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That is pretty crazy. I can definitely see the spike on some of the radar images above, and those kinds of things are rare enough for hail events, let alone debris. Can't wait to read up on it.

I never gave it much thought..always thought it could have been hail, but it's amazing to see.

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That is pretty crazy. I can definitely see the spike on some of the radar images above, and those kinds of things are rare enough for hail events, let alone debris. Can't wait to read up on it.

hail spike with a debris spike south of it? lol

Probably didn't hurt the amount of very heavily forest you had that buzzsaw going through.

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Would think EML days probably happen more frequently in Nina phases in which the PNA is negative out west. However, this was a s/w trough that broke out over the top in the nrn Plains and then moved ESE.

I'm sure Wiz has the stats jotted down on the back of a McDonalds napkin.

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