Cumulus Support

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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.

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CoCoRaHS SWE Measurers - Snow Research Opportunity
Hello CoCoRaHS SWE measurers,

A little over one year ago, we reached out to ask for our most dedicated observers (those who continue through the wintertime to measure snow) to fill out a form to confirm their procedure for measuring the 24-Hour Snowfall Snow Water Equivalent (SWE) is being done correctly.

Thank you for confirming that you do your SWE measurement correctly!

As you know, Snowfall SWE is a distinctly separate measurement from your Gauge Catch.  It is obtained by collecting a core sample of the new snowfall from your snowboard and melting the contents (or weighing) to obtain the liquid value.  It is often times a different value from your Gauge Catch.

CoCoRaHS SWE data are primarily used by NOAA's National Gridded Snowfall Analysis.  According to their lead, Greg Fall, "It is routinely included in media reports, internal briefings, and NWS interactions with stakeholders."  Greg also said, "CoCoRaHS observers provided nearly 80% of the roughly 2.5 million observations used for daily snowfall analysis throughout the season. This is no mere plurality—CoCoRaHS observers are plainly essential to the consistency and accuracy of the snowfall information the NWS provides to the Nation."

Last year we invited you to a new study being conducted by a recent graduate of the University of Maryland working with partners at NOAA.  Several of you participated and the research resulted in a poster presentation and thesis paper.

The goal of the research is to see how the water content of freshly falling snow changes throughout the duration of a storm, and they would like to conduct more data this winter.  Please see below for details on participating again, or for the first time!

After signing up, they will contact you when they identify a storm of significance is approaching, and hopefully you'll be able to help.  Please see below for more details:
 
My name is Matthew Collins, and I am a recent graduate from the University of Maryland and together with my mentor Daniel Cobb at NOAA, this project is titled “Investigation of the Dynamic Nature of Snow-Liquid-Ratio (SLR) During the Course of a Winter Storm”.
 
Calculating and forecasting SLR is challenging.  SLR significantly impacts snowfall forecasts, and a poor SLR forecast can adversely affect realized snowfall totals.  Although model ensembles are used to calculate SLR, there is limited physical data and verification to show how SLR changes throughout the course of a winter storm. This project aims to provide insights into the dynamics of SLR during winter storms with hopes of improving snowfall forecasting.
 
As Nolan mentioned above, if you are willing to take three-hourly and occasionally hourly measurements during snow events throughout this winter, please read our instructions here where you can sign up to participate (or click on the photo below).  From there, we will only contact you in advance of coming storms where we hope you can be available to make measurements throughout the duration of the event.
 
Thank you for your consideration, and I hope to meet you via email if you choose to sign up.
Image of multiple snow layers from a single snow event
Help researchers study how the water content of freshly falling snow can change throughout the duration of a storm!  Click on the photo to sign up for this project.

Stay tuned for more newsletters throughout 2025, and thanks again for being some of our most faithful volunteers in the network!

Sincerely,
Nolan
Nolan Doesken
Founder, Community Collaborative Rain, Hail and Snow network (CoCoRaHS)
Colorado State University 
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