For more than 30 years, Albert A. Bartlett published “Thermal patterns in the snow” in this journal. These are patterns produced by heat sources underneath the snow. Bartlett’s articles encouraged me to pay attention to patterns in snow and to understanding them. At winter’s end the last snow becomes dirty and is heaped into piles. This snow comes from the final clearing of sidewalks and driveways. The patterns observed in these piles defied my intuition. This melting snow develops edges where dirt accumulates, in contrast to ice cubes, which lose sharp edges and become more spherical upon melting. Furthermore, dirt absorbs more radiation than snow and yet doesn’t melt and round the sharp edges of snow, where dirt accumulates.

1.
Albert A.
Bartlett
, “
Thermal patterns in the snow, Part I
,”
Phys. Teach.
14
,
14
18
(
Jan.
1976
).
2.
Albert A.
Bartlett
, “
Thermal patterns in the snow, Part II
,”
Phys. Teach.
14
,
86
90
(
Feb.
1976
).
3.
Albert A.
Bartlett
, “
A thermal-gravitational pattern in the snow
,”
Phys. Teach.
16
,
642
(
Dec.
1978
).
4.
Albert A.
Bartlett
, “
A thermal pattern in the snow
,”
Phys. Teach.
17
,
193
(
March
1979
).
5.
Albert A.
Bartlett
, “
A thermal pattern in the snow
,”
Phys. Teach.
18
,
55
(
Jan.
1980
).
6.
Albert A.
Bartlett
, “
A thermal pattern in the snow
,”
Phys. Teach.
18
,
137
(
Feb.
1980
).
7.
Albert A.
Bartlett
, “
Thermal patterns in the snow
,”
Phys. Teach.
20
,
36
37
(
Jan.
1982
).
8.
Albert A.
Bartlett
, “
More thermal patterns in the snow
,”
Phys. Teach.
20
,
172
(
March
1982
).
9.
Albert A.
Bartlett
, “
The evolution of a thermal pattern in the snow
,”
Phys. Teach.
21
,
40
41
(
Jan.
1983
).
10.
Albert A.
Bartlett
and
John C.
Groft
, “
A thermal pattern in the snow
,”
Phys. Teach.
21
,
251
(
April
1983
).
11.
Albert A.
Bartlett
, “
Thermal patterns in the snow: Structure of a roof
,”
Phys. Teach.
37
,
120
121
(
Feb.
1999
).
12.
Albert A.
Bartlett
, “
Thermal patterns in the snow: Icicles as indicators of heat loss
,”
Phys. Teach.
46
,
172
177
(
March
2008
).
13.
J. J.
Rhodes
,
R. L.
Armstrong
, and
S. G.
Warren
, “
Mode of formation of ablation hollows controlled by dirt content of snow
,”
J. Glaciol.
33
,
135
137
(
1987
).
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