I think it's always been the Sunday preceding Columbus Day/Indigenous Peoples Day, unless I'm mistaken.
I was thinking to when Khalid Khannouchi set WR, Oct 24th 1999, somehow thinking it was held later in October. But Paula R set WR Oct 13th 2002 same as this year's date.
In 2006 it was held on October 22, and Columbus Day was October 9 that year. The years before and after, it was held preceding Columbus Day. Odd
The findmymarathon tool is predicting a tailwind for 4% of the course, and a headwind for 68%. Since the course is basically a loop, how is this possible?
If you run with a 8mph tailwind at 8mph, it's not a "helpful" tailwind. Given it's a running website, I'm assuming they're making this assumption as well. So they're only are giving you numbers where the wind is a net positive.
Any tailwind at all is a "helpful" tailwind.
Even if the wind is traveling at a slower speed than you are, the air resistance will still be reduced. Even on a still day, runners will experience quite a bit of drag as they displace the air, but a tailwind (any at all) will cut this down dramatically.
You are indeed mistaken. For at least a few years in the early 1990's it was held on the last Sunday of October. The 1993 edition was on Halloween under nasty conditions - temperature was right at freezing, but there was a fairly brisk wind and even blowing snow near the end of the race. (If my memory serves)
I ran in that 1993 edition. Mix of freezing rain and snow most of the way, horrible wind in your face running north up LSD. I recall trying to thaw out PowerBars in my armpit. Quite an unpleasant day out there.
Weather looks fine. 55 w./ 43 dew point so no real humidity. Temp basically won't change during the race. It will be windy but Chicago is a big race. Find some other runners to share the work with & it's better than a lot of years there. Saturday/Monday weather looks roughly the same so the weather shouldn't change too much at this point. All about mindset at this point. No reason to think about the weather. Don't have to make a pace adjustment. Just go out and race.
If you run with a 8mph tailwind at 8mph, it's not a "helpful" tailwind. Given it's a running website, I'm assuming they're making this assumption as well. So they're only are giving you numbers where the wind is a net positive.
Any tailwind at all is a "helpful" tailwind.
Even if the wind is traveling at a slower speed than you are, the air resistance will still be reduced. Even on a still day, runners will experience quite a bit of drag as they displace the air, but a tailwind (any at all) will cut this down dramatically.
So explain where the 4% number came from? That was the question. Feel free to offer your own hypothesis, I gave mine.
Even if the wind is traveling at a slower speed than you are, the air resistance will still be reduced. Even on a still day, runners will experience quite a bit of drag as they displace the air, but a tailwind (any at all) will cut this down dramatically.
So explain where the 4% number came from? That was the question. Feel free to offer your own hypothesis, I gave mine.
Well now it's saying tailwind for 17% and headwind for 6%, so these numbers seem completely made up. Important thing is that while it may be a little breezy, the weather otherwise looks great. Second what NERunner03533 said.
If you run with a 8mph tailwind at 8mph, it's not a "helpful" tailwind. Given it's a running website, I'm assuming they're making this assumption as well. So they're only are giving you numbers where the wind is a net positive.
Any tailwind at all is a "helpful" tailwind.
Even if the wind is traveling at a slower speed than you are, the air resistance will still be reduced. Even on a still day, runners will experience quite a bit of drag as they displace the air, but a tailwind (any at all) will cut this down dramatically.
They're probably factoring in the presence of buildings and similar obstacles, always a factor in Chicago. The wind should be out of the WNW, so it's not only going to be a crosswind for most of the race, but will be somewhat in your face during the north-facing sections, not to mention the many wind tunnels that will result. Being a crosswind can negate a lot of any possible tailwind benefit when running south.
Even when you turn to run east near UIC, shorter buildings directly north of the roadway will probably dampen some of the tailwind before you turn south.
Even if the wind is traveling at a slower speed than you are, the air resistance will still be reduced. Even on a still day, runners will experience quite a bit of drag as they displace the air, but a tailwind (any at all) will cut this down dramatically.
They're probably factoring in the presence of buildings and similar obstacles, always a factor in Chicago. The wind should be out of the WNW, so it's not only going to be a crosswind for most of the race, but will be somewhat in your face during the north-facing sections, not to mention the many wind tunnels that will result. Being a crosswind can negate a lot of any possible tailwind benefit when running south.
Even when you turn to run east near UIC, shorter buildings directly north of the roadway will probably dampen some of the tailwind before you turn south.
Truly amazing knowledge on here about wind resistance and where it's blowing from. Good Lord, you think someone is going to cancel they're zillion dollar entry just because there is wind resistance even if it's blowing slower than you?? Great analysis, but better entertainment to read the back & forth..
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Not really sure what the OP is going on about. The weather looks far from worst case scenario. Temps should be in the 50s with cloudy conditions and relatively low humidity for the Midwest. Yea, there will be wind but it will from the WNW shifting to from the north throughout the day. Guess what, from miles 8 thru 13 and 15.5 thru 23 that wind will mostly be at your back. Yea, those last couple miles up Michigan Ave could be rough into the wind, but my recommendation is to hold back the effort until you make that last turn north and let the tailwind do some work for you before then.
For the plodders in Waves 2 and 3 that might take 5-6 hours to finish this thing, yea, they could run into trouble with higher temps and increasing wind. But the faster Wave 1 runners should be fine if they don't blow their load in the first 15 miles.
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Have run Chicago 5 times and live and work in the city. If I recall 2009 had approximately the exact weather predicted for Sunday. Certainly warmer than I like but not bad. It was also windy from the WNW. Chicago is funny with all of the buildings creating weird anomalous winds. Just when you think you're going to get a tailwind you turn down a street and suddenly hit with a huge gust straight at you. The only time the wind seems to be true to the direction is the long northward stretch heading up through Lincoln park. Likewise the long southward stretch heading back (miles 7.5-12.5) and then again way down south and heading back up Michigan ave. I also believe they changed to Columbus day weekend is to maximize tourist dollars. I see Carey Pinkowski on the train quite a bit and perhaps will ask him...
Have run Chicago 5 times and live and work in the city. If I recall 2009 had approximately the exact weather predicted for Sunday. Certainly warmer than I like but not bad. It was also windy from the WNW. Chicago is funny with all of the buildings creating weird anomalous winds. Just when you think you're going to get a tailwind you turn down a street and suddenly hit with a huge gust straight at you. The only time the wind seems to be true to the direction is the long northward stretch heading up through Lincoln park. Likewise the long southward stretch heading back (miles 7.5-12.5) and then again way down south and heading back up Michigan ave. I also believe they changed to Columbus day weekend is to maximize tourist dollars. I see Carey Pinkowski on the train quite a bit and perhaps will ask him...
Nah 2009 was chilly, about 40 at the start, perfect conditions (at least for me) and a big PR resulted. I raced the whole thing in a long sleeve shirt!
Good news/not great news with the latest forecast. The front seems to have slowed up a bit and now isn't supposed to come through until late morning/early afternoon. So the early winds shouldn't be nearly as bad, but the overnight temps aren't supposed to dip quite as much so a bit warmer overall.
Good news/not great news with the latest forecast. The front seems to have slowed up a bit and now isn't supposed to come through until late morning/early afternoon. So the early winds shouldn't be nearly as bad, but the overnight temps aren't supposed to dip quite as much so a bit warmer overall.
Latest run has the winds waiting until even later now, closer to noon before they really pick up. Good news there, but those winds are going to be bring the dry air. So the relative humidity will be high in the morning, but dew points just in the lower 50's at least. The trade off on which is better, the humidity and light winds versus dryer air and windier conditions is probably just an individual one.