Dador wrote
Yes, currently you can use the snowfall24h field for this. However, I believe that entering even 0.1 cm there to indicate a day with snowfall will result in incorrect interpretation of the measurements.
In my area, fine snowfall from stratus clouds often occurs in winter. They do not form any cover, nor are they measurable by a heated rain gauge. However, despite everything, I would classify such a day as a day with snowfall.
We can agree to disagree.
I identify a snow day when there is visible evidence of snow, like you do. I prefer to record it in a measurable amount rather than was it snowing; Yes or No.?
My snow recording has been guided by my participating in the CoCoRaHS program
https://www.cocorahs.org/Content.aspx?page=aboutus
Code: Select all
24-Hour Precipitation Report Form
Station Number : CAN-ON-784
Station Name : Komoka 3.1 W
*
Denotes Required Field
12/8/2024
*Observation Date Date rain gauge was emptied and read. For observations spanning more than 24 hours
Enter Multi-Day Accumulation
9:00
AM
*Observation Time Time rain gauge was emptied and read.
0.0
mm *Gauge Catch: Rain and Melted Snow in millimeters to the nearest 0.1 mm that has fallen in the gauge during the past 24 hours, or T for trace, or NA for unknown. Precipitation (rain and the melted water content of snow) that fell in the rain gauge for the past 24-hours ending at your observation time.
Observation Notes: (This will be available to the public)Narrative description of significant weather during the past 24 hours. See the Daily Comments Report for examples of notes from other observers.
24-hr Snowfall
NA
cm Snowfall: Accumulation of new snow in centimeters to the nearest 0.1 cm The maximum depth of new snow that fell in the past 24-hours on your snowboard, measured to the nearest 0.1 cm.
NA
mm Snowfall SWE: Melted value from core to the nearest 0.1 mm The amount of water present in a core sample of the new snow on your snowboard taken with a rain gauge.
Snowpack (Total Snow and Ice on Ground at Observation Time)
NA
cm Snowpack Depth: Total snow and ice (new and old) in centimeters to the nearest 0.1 cm Total amount of snow and ice (new and old snow and ice combined) on the ground at observation time measured to the nearest 0.1 cm.
NA
mm Snowpack SWE: Melted value from core to the nearest 0.1 mm The amount of water present in a core sample of the total depth of snow on the ground and includes both new snow that has fallen in the past 24 hours plus any old snow remaining on the ground.
Their guideline is that when rain or snow cannot be measured - i.e. less than 0.2 mm or 0.001 in. to us "Trace" and if a measurement is not available then use "NA". Since the CMX diary can only accept numeric entry so cannot use "Trace",
Since a "trace" cannot be entered in the diary I use 0.1 mm. Unlike rain, snow cannot be measured or visually observed to a 0.2 mm accuracy so I choose the next best thing.
Enjoy,
Paul
