FAIRBANKS – The ice went out at 3:41 p.m. in Nenana on Monday and there was only one winning ticket holder in what was the latest breakup on record in the 97-year-old Nenana Ice Classic.
The official winning time was 2:41 p.m. Alaska Standard Time because the contest uses standard, not daylight, time to determine the winner(s).
The date and time was 2013, May, 20th, 2:41 PM AST,
day 139.612 day 140.362 [correction]
The existing record 1964, May 20th, 11:21 AM AST, day
140.487 140.104 [correction], 1964 was a leap year.
This is a repost of an existing article with updates.
When I checked on the numeric data for the Nenana Classic I discovered NSIDC haven’t updated since 2003, NOAA don’t seem to provide in a simple format.
Whole articles are done quickly, not strictly, so lighten up if you want to complain about end corrected filters. Â Writing this before anyone…
I’ve added the later data to the old version, wrote a script and created a new version.
A tricky problem is the usage of 12:xx PM, meaningless. See this from NPL
I’ve assumed eg. 12:30 PM is 12:30 hrs
CSV in a .zip here (all of 2k) Updated to include 2013
Official data here, 2012 is missing.
[update]Â Gerhard Kramm at WUWT posts about the equinox suggesting 2013 is later in the year.
Please discuss. Nothing like yet another confounding factor!
I thought I had corrected for the Gregorian calender wobble but on a detail check, no.
The effect does make 2013 the latest ice break date relative to earth orbit, without taking into account fine detail of orbital variation such as nutation.
This is now computed as julian day number modulo 365.24219 with the reference the nominal 1st Jan.
Data file has been updated.
If you think this is still in error, please say.
Post by Tim Channon