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August 2012 General Discussion


Chicago WX

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DTW briefly sneaked to 79F today. High imby was 76F. 11 of the past 13 days have had below-normal departures (the two other days had departues of 0F and +1F). But still, DTWs departure through the 21st is I believe just -0.4F, but as others said that will go up at the end of the week. I honestly cannot explain why almost EVERY day they are warmer than every station, including those in Wayne county. The only 2 things I can think of is thermometer calibration, which per stebo they take very good care at DTW and have backups...and the more likely theory I guess is downsloping (see YIP). I just dont understand why this is a new max-temp-phenomena not experienced until about this spring or so. UHI for low temps has been going on for years though. Down in TOL I think their station is in a rural area, as they radiate very well...their departure is over -2F (and likewise they are over 2F colder than DTW on mean temp this month).

BTW picked up 0.34" of rain in those storms this afternoon. Thunder was LOUD.

DTW was not warmer than every other station. Ann Arbor was 82, Ypsilanti 83, Adrian 80, and Troy 79. Like many days this summer, the warmer readings were confined to the western parts of SE Michigan. DTW is closer to YIP and ARB than it is to DET. While YIP is often suspiciously high, I don't think anyone would suggest ARB has a warm bias. It often reads 5 to 10 degrees colder than anywhere else in the mornings, and yet it has been running as high or higher than DTW most afternoons.

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That one that intersects Michigan... Am I reading the map correct that it strengthened over land? Of course it would have been extra tropical but that is some wild stuff.

That track looks like the 1900 Galveston hurricane, which behaved in a way not unlike Ike in 2008. I believe there were 80 mph gusts around Chicago.

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That track looks like the 1900 Galveston hurricane, which behaved in a way not unlike Ike in 2008. I believe there were 80 mph gusts around Chicago.

It brought a lot of tree damage to Lafayette too, but no 80 mph gusts. I wrote a guest column for the J&C in Lafayette about the Galveston hurricane in Lafayette if anyone's interested.

http://www.jconline.com/article/20120728/COLUMNISTS/307290018

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It brought a lot of tree damage to Lafayette too, but no 80 mph gusts. I wrote a guest column for the J&C in Lafayette about the Galveston hurricane in Lafayette if anyone's interested.

http://www.jconline.com/article/20120728/COLUMNISTS/307290018

Thanks for sharing. One thing though...if 5 min average wind topped 60 mph, isn't it conceivable that gusts may have been significantly higher?

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Thanks for sharing. One thing though...if 5 min average wind topped 60 mph, isn't it conceivable that gusts may have been significantly higher?

Yeah sorry. For some reason I thought those were one minute averages, not five minute. In that case it's likely there were gusts over hurricane force in Lafayette too.

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Thanks for posting that. By the way, you need a red tag.

Thanks! I contribute a weather column every month with a fifth Sunday. I'm looking for a topic for September, so if anyone has a weather history topic they'd like me to cover I'm all ears.

Not sure how to get a red tag, but if a mod can do it, that'd be great.

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Thanks! I contribute a weather column every month with a fifth Sunday. I'm looking for a topic for September, so if anyone has a weather history topic they'd like me to cover I'm all ears.

Not sure how to get a red tag, but if a mod can do it, that'd be great.

I'd have to think about that. You'd probably want it relevant to the season, but September is usually rather bland around here.

From IND:

FURTHER OUT...GFS AND EURO IN COMPLETE DISAGREEMENT IN REGARD TO TROPICAL CYCLONE ISAAC. BOTH MODELS BRING IT UP THROUGH THE

GULF...BUT THAT/S WHERE THEIR AGREEMENT ENDS. THE GFS IS FASTER WITH PROJECTED LANDFALL ON TUESDAY AFTERNOON...WHILE THE

EURO IS SHOWING TUESDAY NIGHT. IN REGARD TO TRACK...THE GFS CONTINUES TO SHOW A DEEP CURVATURE TO THE NORTHEAST...MISSING

CENTRAL INDIANA ALTOGETHER...WHEREAS THE EURO BRINGS THE SYSTEM DIRECTLY OVER CENTRAL INDIANA.

The Euro has been superior all summer at this range. Let's see how it handles a tropical system. We could use a major soakage.

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That track looks like the 1900 Galveston hurricane, which behaved in a way not unlike Ike in 2008. I believe there were 80 mph gusts around Chicago.

http://www.isws.illinois.edu/atmos/statecli/2008/September2008/tropical.htm

Within that link is a summary of the Ike event in Illinois. No 80-MPH winds (though I recall it being fairly breezy), but the Ike remnants in concert with a stationary cold front produced up to eight to ten inches of rain across portions of the Chicago area. In fact, this was the previous record-holder at ORD for largest calendar-day rainfall tally until 23 July 2011 beat it out. The Ike event followed Gustav remnants, which also produced heavy rain across portions of Illinois (and Missouri).

Overall, in September 2008, I measured 13.64 in. of rain, which would probably qualify it as the wettest month (perhaps rivalled by July 1996 or August 2007) during my nearly 21 years living in Geneva.

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I'd have to think about that. You'd probably want it relevant to the season, but September is usually rather bland around here.

From IND:

FURTHER OUT...GFS AND EURO IN COMPLETE DISAGREEMENT IN REGARD TO TROPICAL CYCLONE ISAAC. BOTH MODELS BRING IT UP THROUGH THE

GULF...BUT THAT/S WHERE THEIR AGREEMENT ENDS. THE GFS IS FASTER WITH PROJECTED LANDFALL ON TUESDAY AFTERNOON...WHILE THE

EURO IS SHOWING TUESDAY NIGHT. IN REGARD TO TRACK...THE GFS CONTINUES TO SHOW A DEEP CURVATURE TO THE NORTHEAST...MISSING

CENTRAL INDIANA ALTOGETHER...WHEREAS THE EURO BRINGS THE SYSTEM DIRECTLY OVER CENTRAL INDIANA.

The Euro has been superior all summer at this range. Let's see how it handles a tropical system. We could use a major soakage.

12z Euro coming west. Rather than getting hung up with exact solutions at this point, what I'm taking away is that a western solution (west of FL) can't be written off yet.

Edit: makes landfall near the TX/LA border. Might take its sweet time coming north though given the setup.

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12z Euro coming west. Rather than getting hung up with exact solutions at this point, what I'm taking away is that a western solution (west of FL) can't be written off yet.

Edit: makes landfall near the TX/LA border. Might take its sweet time coming north though given the setup.

FWIW a 12Z Euro type solution would probably be best case scenario in terms of drought busting rains..

Takes a nice tour through the southern plains before heading northeast towards the lakes...

Still wayy out in la-la land though so just something to keep an eye on..

ecm_mslp_uv850_tropical_11.png

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We've lost 1 hour and 50 minutes of daytime since the solstice, solar noon angle has dropped over 12 ° as well (making sunlight over 10% weaker at solar noon). The trees know it, plenty beginning to change color. I'm sure the drought is contributing some but I think it's the real deal.

The 90s in the area today are more impressive when you consider how much weaker then sun is getting. Thank goodness we're on the solar downswing since this could've easily turned into a monster heat wave like the previous one if we were at full heating.

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We've lost 1 hour and 50 minutes of daytime since the solstice, solar noon angle has dropped over 12 ° as well (making sunlight over 10% weaker at solar noon). The trees know it, plenty beginning to change color. I'm sure the drought is contributing some but I think it's the real deal.

The 90s in the area today are more impressive when you consider how much weaker then sun is getting. Thank goodness we're on the solar downswing since this could've easily turned into a monster heat wave like the previous one if we were at full heating.

Yeah I'm guessing these low to mid 90s would have been around or a bit over 100 3-4 weeks ago.

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