What do you all make of the precipitation forecast at http://forecast.io for the Boston area? Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour. I made an attempt at visually integrating the curve they show, and it yielded a total snowfall of 3 inches for the coming week. That can't be what they mean. Did I mis-integrate? Or have they mis-labeled their vertical axis? Jim Propp
My guess is that these data points are strictly inches of liquid water. I think an approximate conversion to inches of snow would have you multiply (depending on the snow type) by anywhere from 8 to 14.
On Jan 26, 2015, at 4:33 PM, James Propp <jamespropp@gmail.com> wrote:
Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour.
Which reminds me of a question I had. During a rainstorm/snowstorm, how does visibility relate to the density of liquid water/snow in the air?
-----Original Message----- From: math-fun [mailto:math-fun-bounces@mailman.xmission.com] On Behalf Of Hans Havermann Sent: Monday, January 26, 2015 5:30 PM To: math-fun Subject: Re: [math-fun] Let it snow
My guess is that these data points are strictly inches of liquid water. I think an approximate conversion to inches of snow would have you multiply (depending on the snow type) by anywhere from 8 to 14.
On Jan 26, 2015, at 4:33 PM, James Propp <jamespropp@gmail.com> wrote:
Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour.
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My guess is a decimal order of magnitude error on the vertical axis; the textual summary above has numbers more closely matching the widely predicted 24-36" total. On 01/26/2015 04:33 PM, James Propp wrote:
What do you all make of the precipitation forecast at http://forecast.io for the Boston area?
Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour.
I made an attempt at visually integrating the curve they show, and it yielded a total snowfall of 3 inches for the coming week. That can't be what they mean. Did I mis-integrate? Or have they mis-labeled their vertical axis?
This map: < http://www.nytimes.com/interactive/2015/01/26/nyregion/snowfall-totals-aroun... > is supposed to show snow accumulation up to when you view it. It's currently ca. 12:15 am Tuesday, and the map looks quite consistent with a roughly 0.2 in./hr. rate of fall. --Dan
On Jan 26, 2015, at 1:33 PM, James Propp <jamespropp@gmail.com> wrote:
What do you all make of the precipitation forecast at http://forecast.io for the Boston area?
Does "0.2 in/hr" mean one-fifth of an inch per hour? It seems to me, given the severity of the current blizzard, they must mean something closer to two inches per hour.
I made an attempt at visually integrating the curve they show, and it yielded a total snowfall of 3 inches for the coming week. That can't be what they mean. Did I mis-integrate? Or have they mis-labeled their vertical axis?
Jim Propp _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
participants (5)
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Dan Asimov -
David Wilson -
Hans Havermann -
James Propp -
John Aspinall