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From: Dan Richter (1:317/3)
To: All
Date: Fri, 02.04.21 13:00
ES Picture of the Day 02 2021
EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.

Frost Pattern on Cold Window

April 02, 2021

035243255E634A4684822E8ECB91EB40 (1)

Photographer: Mary Kelly
Summary Authors: Mary Kelly; Jim Foster

The photo above shows an elaborate frost pattern on a storm window
in my home in Des Moines, Iowa. It was snapped around midday on
February 6, 2021. Fern-like frost patterns like this will often form on
windowpanes once the outside air temperature drops below about 14
degrees F (-10 C) if there's sufficient moisture (usually transferred
from the inside of the house) to allow frost crystals to grow.

Outside, the air temperature was 9 degrees F (-13 C). The inside
temperature was about 66 degrees F (19 C), but on the second floor,
where the window frost was prominent, it was probably cooler because
the heating vents here aren’t very efficient. Worth noting, the
humidity may have been somewhat higher than normal because the bathroom
shower had been used earlier in the day. Also, it should be mentioned
that the upstairs windows don’t completely latch. So it’s likely that
the cold temperature of the indoor glass allowed moisture in the
upstairs rooms to crystalize directly onto the windowpanes.
* Des Moines, Iowa Coordinates: 41.5868, -93.6250

Related EPODs

Frost Pattern on Cold Window Snowflakes and Symmetry Cracks
in the Ice on Utah Lake Archive - A Day at the Beach Archive -
Ice Coring on Lake Placid Archive - Frozen Breath

Cryosphere Links

* Guide to Frost
* What is the Cryosphere?
* Bentley Snow Crystals
* Glaciers of the World
* Ice, Snow, and Glaciers: The Water Cycle
* The National Snow and Ice Data Center Google Earth Images
* Snow and Ice Crystals

Earth Science Picture of the Day is a service of the Universities
Space Research Association.

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