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Wintry mix potential weekend of Jan 18-19, 2020


wdrag
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53 minutes ago, wdrag said:

Quibble accepted...  Thanks. All i think about is IMPACT... So i definitely define paved vs grass-trees-boards when I can/have time.  In this case... shovel the walk or plow the road, it reaccumulates on untreated at these very cold air temp. Should that air temp during the day get close to 30...paved roads (darker surfaces) melt barring as you say the snowfall rates during the day..  After dark... then we lose that energy and easier to accumulate.  In any case up here at 18F... roads all covered,   but treated roads mixed wet-slight slush. 0.5" set 1P.

 

Thanks.  And I agree on impact being most important.  Don't know if you've seen my sometimes exhaustive (lol) posts on this, but I strongly believe sleet is almost as impactful as snow and that people greatly underestimate the impact of sleet because  3:1 ratio sleet is only about 1/3 the depth of 10:1 snow.  Problem with that thinking is that for 1" of sleet and 3.3" of snow, for example the frozen mass is the same and frozen mass is all that really matters for driving and snow/sleet removal; and, in fact, sleet will melt more slowly than snow, given its much lower surface area per unit volume vs. flakes, since melting occurs at the surface and less SA means slower melting.  The one exception to impact is that sleet obviously has nearly no impact on visibility, which does matter.  

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