I may have given the wrong idea in my last
blog. Maybe talking about the ice conditions and the dogs falling thro the ice
in the same blog was not a good idea, but if reading carefully you will find
that the dogs fell thro in mid December… a few months ago. When talking about
‘falling thro’ right now (late Jan, early Feb) I don’t mean falling thro the
ice… sorry I tend to forget that you, the readers are not here looking out the
window everyday so you don’t know the dynamics of the ice and its cycles. By by
skis ‘falling thro’ I mean they are cutting thro the uppermost layer of snow
into a slush and water layer underneath, which in turn lies on top of the main
ice layer below. So getting your skies wet (and gaining 100 pounds of snow on
them) is the main concern… not falling thro into the lake itself.
The ice on a lake does have cycles, which
undulate and change, can be daily, sometimes hourly. Today the surface of the
lake was very good…. especially in the windblown areas…. despite the +4 celcius
we had yesterday afternoon. In the areas where the wind has not blown the ice
clear, you can still find large hummocks of snow insulating the slush/water
layer underneath. These hummocks may look smooth, white and inviting but the
insulating qualities can present themselves sort of like large smooth, white
snow ‘bridges’ spanning over slushy, watery puddles. Sometimes the skis can cut
thro the ‘bridges’; or the ‘bridges’ fall out from beneath you (boy is that
ever exciting!) but you only land in the slushy puddle that sits underneath –
still on top of the main ice. As for skiing in these conditions…. it can be
somewhat disconcerting, heart thumping and frustrating (you just get into a
good kick and glide and then you cut thro).
Today….. as I said…. it was quite nice.
Ours skies only cut thro the top layers of the snow hummocks a few times but
they did not get wet. Our tracks filled in with water behind us but we were
already gone. The dog fell thro more then our skis did … as did our ski poles,
but for the most part the ice was good a solid. We have had a few days of
moderate winds and it seems allot of the loose snow has been swept away leaving
the ice exposed to get a good freezing. Only the hummocks where the loose
wind-swept snow as settled presented the problem of hitting a slush layer. The
4 inch deep slush and water layer is about 6 inches underneath the crusted snow
hummocks, but the hummock crusts are holding for the most part and under that
is good solid ice.
Lake ice can also develop what we locally
call ‘spider holes’, I don’t know if this is their scientific name and I don’t
know how they form, or why, but they seem to appear during temperate weather,
which we have had quite a span of. They are usually funnel shaped holes in the
ice, with the wide end of the funnel at the surface of the ice and the narrow
end of the funnel towards the lake bottom (but not always)…. but sometimes they
are straight sided all the way down. They can go thro the top layer of ice to
solid ice beneath or they might go thro all ice layers to actual lake water.
They are really quite fascinating.
We
have had quite a crop of funnel shaped spider holes over the last few weeks,
some with the tops big enough for a man to fall in, but bottoms only big enough
for a boot. Regardless, you would not want to fall into one. Four days ago they
were all liquid (some thro and thro, some only the top ice layers) this morning
most are refrozen and safe (we could not break thro them) though we did find
one still liquid thro and thro and a few with watery tops. Usually their
surfaces will refreeze first, and they’ll continue freezing downward until the
whole thing heals up. So during the early stages of refreezing they may not be
safe to approach as a quarter inch of ice can still crack under body weight,
and they can be especially dangerous if fresh snow falls on top hiding their
distinctive black/gray, meandering, spider leg signatures from unsuspecting
trekers… but so far, no fresh snow to cover them.
Sooooo ice conditions as of this morning… very
nice, watch out for open spider holes, keep moving if you cut thro a snow
hummock. We really enjoyed ourselves this morning, tho Charley’s spindly feet
kept falling thro (the top layers), but he was pretty quick to figure out that
he needed to stick to the windswept patches… and fun was had by all!