The following procedures were developed from previous National Weather Service procedures and input from a broad
array of expertise from climatologists, snow specialists, weather observers, and data users. Some of the materials
have been extracted from "The Snow Booklet" by Nolan J. Doesken and Arthur Judson, CSU, 1996).
Each season before the first snows come: Review these instructions for measuring snow. It is easy to forget what
needs to be measured, especially in those parts of the country where snow falls infrequently.
At the beginning of each snowfall/freezing season, remove the funnel and inner measuring tube of the eight-inch
manual rain gauge to expose the 8-inch diameter overflow can so that it can more accurately catch frozen precipitation.
Put your snowboard(s) out and mark their location with a flag or some other indicator so they can be found after
a new snowfall. They should be located in the vicinity of your station in an open location (not under trees,
obstructions, or on the north side of structures in the shadows). Once your equipment has been readied for
winter you are prepared for taking snowfall measurements.
Observers should determine three values when reporting solid precipitation. They are:
Snowfall: Measure and record the snowfall (snow, ice pellets ) since the previous snowfall observation (24 hours). (See Snowfall section below for details)
Snow Depth: Determine the depth of the new and old snow remaining on the ground at observation time. (See Snow Depth section below for details)
Water Equivalent of Snow: Water equivalent of melted snow collected in the gauge since the last observation. (See Water Equivalent section below for details)
Measure and record the greatest amount of snowfall that has accumulated on your snowboard (wooden deck or ground if board is not
available) since the previous snowfall observation. This measurement should be taken minimally once-a-day but can be taken up to
four times a day, (every 6 hours) and should reflect the greatest accumulation of new snow observed (in inches and tenths, for
example, 3.9 inches) since the last snowfall observation. Snowfall amounts can be measured hourly or at any interval as long as the snow measurement board is NOT cleared more frequently
than once every 6 hours.
If you are not available to watch snow accumulation at all times of the day and night, use your best estimate, based on a measurement
of snowfall at the scheduled time of observation along with knowledge of what took place during the past 24 hours. If you are not
present to witness the greatest snow accumulation, input may be obtained from other people who were near the station during the
snow event. If your observation is not based on a measurement, record in your remarks that the "snow amount based on estimate".
Remember, you want to report the greatest accumulation since the last observation. If snowfall occurred several times during the
period, and each snowfall melted either completely or in part before the next snowfall, record the total of the greatest snowdepths
of each event and enter in your remarks "snowfall melted during the OBS period". For example, three separate snow squalls affect
your station during your 24-hour reporting day, say 3.0, 2.2, and 1.5 inches. The snow from each event melts off before the next
accumulation and no snow is on the ground at your scheduled time of observation. The total snowfall for that reporting 24-hour
day is the sum of the three separate snow squalls, 6.7 inches, even though the snow depth on your board at observation time was
Snow often melts as it lands. If snow continually melts as it lands, and the accumulation never reaches 0.1 inches on your
measuring surface, snowfall should be recorded as a trace (T) and record in your remarks that the "snow melted as it landed".
It is essential to measure snowfall (and snow depth) in locations where the effects of blowing and drifting are minimized. Finding
a good location where snow accumulates uniformly simplifies all other aspects of the observation and reduces the numerous
opportunities for error. In open areas where windblown snow cannot be avoided, several measurements may often be necessary to
obtain an average depth and they should not include the largest drifts. In heavily forested locations, try and find an exposed
clearing in the trees. Measurements beneath trees are inaccurate since large amounts of snow can accumulate on trees and never
reach the ground.
If your daily schedule permits, you may wish to make a snowfall observation every 6-hours, beginning with your regularly scheduled
time of observation. This is the procedure followed by National Weather Service Forecast Offices. Follow the same rules for a
once-a-day observation, but the snow accumulation reported will be the greatest for the previous six hours instead of 24 hours.
If you take your observations at this frequency, make sure that you clear your snowboard (or other measuring surface) no more
than once every 6 hours. Record the frequency of observations during the day in the comments section of your report. Never
sum more than four, six-hourly observations to determine your 24-hour snowfall total. If you use more than four observations,
it would falsely increase snowfall totals.
Freezing rain (glaze ice) should never be reported as snowfall. This precipitation type is liquid precipitation and should be
reported as such.
Determine the total depth of snow, ice pellets, or ice on the ground. This observation is taken once-a-day at the scheduled
time of observation with a measuring stick. It is taken by measuring the total depth of snow on exposed ground at a
permanently-mounted snow stake or by taking the average of several depth readings at or near the normal point of observation
with a measuring stick. When using a measuring stick, make sure the stick is pushed vertically into the snow until the bottom
of the stick rests on the ground. Do not mistake an ice layer or crusted snow as "ground". The measurement should reflect
the average depth of snow, ice pellets, and glaze ice on the ground at your usual measurement site (not disturbed by human
activities). Measurements from rooftops, paved areas, and the like should not be made.
Note: Hail accumulation is not entered
with snow and ice pellets. Hail accumulation is entered in the “/remarks/” section with the amount and diameter (inches and
tenths) of the stones.
Report snow depth to the nearest whole inch, rounding up when one-half inch increments are reached (example 0.4 inches gets
reported as a trace (T), 3.5 inches gets reported as 4 inches). Frequently, in hilly or mountainous terrain, you will be
faced with the situation where no snow is observed on south-facing slopes while snow, possibly deep, remains in shaded or
north-facing areas. Under these circumstances, you should use good judgment to visually average and then measure snow
depths in exposed areas within several hundred yards surrounding the weather station.
For example, if half the exposed ground is bare and half is covered with six inches of snow, the snow depth should be
entered as the average of the two readings, or three inches. When in your judgment, less than 50 percent of the exposed
ground is covered by snow, even though the covered areas have a significant depth, the snow depth should be recorded as a
trace (T). When no snow or ice is on the ground in exposed areas (snow may be present in surrounding forested or otherwise
protected areas), record a "0".
When strong winds have blown the snow, take several measurements where the snow was least affected by drifting and average
them. If most exposed areas are either blown free of snow while others have drifts, again try to combine visual averaging
with measurements to make your estimate.
Water Equivalent of Snowfall:
Measuring the water equivalent of snowfall since the previous day's observation. This measurement is taken once-a-day at
your specified time of observation. Melt the contents of your gauge (by bringing it inside your home or adding a measured
amount of warm water) and then pour the liquid into the funnel and smaller inner measuring tube and measure the amount
to the nearest .01 inch (use NWS provided measuring stick) just as you use for measuring rainfall. Do not measure the
melted precipitation directly in the large 8-inch outer cylinder. Make sure the inner measuring tube can't fall over
when pouring the liquid back into it. If the melted water equivalent (including any added warm water) exceeds two
inches and cannot fit into the measuring tube all at one time, then empty the full measuring tube and pour the
remaining liquid from the large 8-inch outer cylinder into the emptied measuring tube. Then, add and record the
water equivalent of the multiple measurements.
If you added warm water to the gauge to melt the snow, make sure you accurately measure the amount of warm water added before pouring it into the gauge. Then, when you take your liquid measurement, subtract the amount of warm water added from the total liquid measurement to get your final liquid water equivalent of the snowfall.
As winds increase, gauges collect less and less of the precipitation that actually falls. Generally speaking, the stronger
the wind and the drier the snow, the less is captured in the gauge. If you notice that less snow is in the gauge than
accumulated on the ground, you should first empty any existing snow from inside the 8-inch cylinder, then use it to take
a snow sample, sometimes referred to as "take a core" or "cut a biscuit" from your snow board with the 8-inch overflow
can. Melt the biscuit of snow, pour the liquid into the small measuring tube to measure the water equivalent.
National Weather Service
Weather Forecast Office Greenville-Spartanburg
GSP International Airport
1549 GSP Drive
Greer, SC 29651
Questions or Comments? Send us email
Page last modified: June 29, 2012