Ice Phenology Investigation
River Freeze-Up Data Sheet
School Name: _____Tri_Valley School__________________ Study Site: __Healy, AK_____
Observer Names:___Mark Martin________________________________
Date: Year:_____2009___ Month: _____Nov_____ Day: ____11th_____
Local Time (hour:min): ________1:30pm_______ Universal Time (hour:min): ______________
General Freeze-Up Ice Observations:
Upstream (border ice only):
Estimate fraction of width covered by border ice:
Changes in border ice:
Downstream (border ice only):
Estimate fraction of width covered by border ice:
Changes in border ice:
Across stream (ice in open water only):
Ice types:
_55____ %
❒ None ❒ X Fractured ❒ Flooding Movement
__50___ %
❒ None ❒ X Fractured Flooding Movement
❒ None X Frazil Pancakes, small
❒ Pancakes, large
Yes X No (just a little)
Frost smoke?
Ice surface:
(may choose more than 1)
Snow on ice:
Snow on bank/shore:
❒ Smooth X Rough ❒ Blocky/Broken/Jumbled Wet/Flooded
❒ Holes/Leads ❒ Bare (melting) ❒ Ice jam
❒ None (cold) ❒ New, patchy New, continuous
❒ Stable with new snow layer Stable/No change ❒ X Wind redistributed
❒ Icy crust ❒ Melting/Wet ❒ None (warm)
❒ None ❒ New, patchy New, continuous ❒ Stable with new snow layer
Stable/No change ❒ X Wind redistributed ❒ Icy crust ❒ Melting/Wet
Environmental Observations:
Cloud Cover:

If Three-quarters or More of the Sky is Visible: (Check one)
No Clouds
Clear
Isolated
Scattered
0%-No Clouds ❑ <10% Clouds ❑ 10-25% Clouds ❑ 25-50% Clouds
Broken
Overcast
❑ 50-90% Clouds ❑ X >90% Clouds

If View of More than One-quarter of the Sky is Blocked:
Obscured ❑ Check here
Why is the view of the sky blocked? (Check all that apply)
❑ X Blowing Snow ❑ Heavy Snow ❑ Heavy Rain ❑ Fog ❑ Spray
❑ Volcanic Ash ❑ Smoke ❑ Dust ❑ Sand ❑ Haze
Wind*:
Precipitation type:
Calm (0 m/s) ❒ Light wind (0.3-5.4 m/s) ❒ X Windy (>5.4 m/s)
None ❒ X Snow flurries ❒ Snowing ❒ Fog/Drizzle ❒ Rain ❒ Freezing rain
*See Ice Phenology Investigation Field Guide for definitions.
Kim Morris, Geophysical Institute, Univ. of Alaska Fairbanks
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Environmental Observation Comments:
It was -4 degrees Celsius at time of observation and very windy!
Standard Photograph Set of River Ice Frreze-Up:
Enter the filename of each photo and accompanying comments here:
Across Photo:
HLY_091111_Acr
Comments:____________________________________________________________________________
_______________________________________________________________________
Downstream Photo:
HLY_091111_Dn
Comments:
_____________________________________________________________________________________
__________________________________________________
Upstream Photo:
HLY_091111_Up
Comments:____________________________________________________________________________
_______________________________________________________________________
Optional Photographs of River Ice Freeze-Up:
Enter the filename of each photo and accompanying comments here:
Additional Photo 1:
XXX_999999_ADD1
Comments:____________________________________________________________________________
_______________________________________________________________________
Additional Photo 2:
XXX_999999_ADD2
Comments:____________________________________________________________________________
_______________________________________________________________________
Additional Photo 3:
XXX_999999_ADD3
Comments:____________________________________________________________________________
_______________________________________________________________________
Other Comments:
Kim Morris, Geophysical Institute, Univ. of Alaska Fairbanks
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