WET SNOW WITH ABOVE FREEZING GROUND- Wet snow is snow that has a high liquid content as it reaches the surface. About Will It Snow Will it snow is updated 4 times a day using the very latest data, so check back regularly to stay upto date. NBC Philadelphia: Mythbuster: Does 10 Inches of Snow Equal 1 Inch of Rain? Graham holds a Bachelor of Science in economics. Rain to Snow Formula The following formula is used to calculate the amount of snow in inches from rain in inches. To find volume, measure the length, width, and depth in feet. Lv 7. To calculate the snow-to-liquid ratio, divide the amount of snow by the depth of water you would measure if you melted the snow into liquid. For example, to calculate the snowfall equivalent of 3 inches of rain, multiply 3 by 10 to obtain 30 inches of snow as the baseline conversion. Perform the calculations in reverse to calculate snow to rain. Rainfall calculator. Converting rain to snow is the process of calculating the amount of snow that would fall from a given amount of rain precipitation if it was cold enough outside. Find the depth of snow using a ruler or stick to see how deep the snow is. Click the left and right arrows to cycle through the images in three hourly intervals or drag the slider to jump to a particular time. The "average" snow to liquid ratio is 10:1. For example, for 8 inches of snow falling at a temperature of 20 degrees Fahrenheit, divide 8 by 15, since the conversion factor for 20 degrees is 15. The density of any material is critical to calculating weight. For example, a ratio of 10:1 means for 10 inches of snow there would be one inch of water, if it is completely melted down. For example, to calculate the snowfall equivalent of 3 inches of rain, multiply 3 by 10 to obtain 30 inches of snow as the baseline conversion. It is not advisable for a person to climb onto a snow- or ice-covered roof to remove accumulations. Online Snow Load Calculator(for Buildings with Flat or Low Slope Roofs - for Balanced Snow, Drift, and Rain-on-Snow Surcharge Loadings) calculator (ASCE 7-05) for structural engineers, construction professionals and building planners. More densely packed and wet snow is in the ratio of 8 inches of snow to 1 inch of equivalent rainfall, and more powdery snow is … For this example we will say the total amount of precipitation is expected to be 2inches of rain. To calculate total precipitation you need both rainfall amounts and snowfall amounts, and you have to convert them to the same units somehow, as 1 inch of snow is not the same as 1 inch of rain. The Snow Day Calculator continues to get yearly press from both National and local news sources that routinely reference The Snow Day Calculator predictions in their articles about upcoming snow storms. The amount is indicated in m3 (=1000 liters, for US/UK units click here). So 1 inch of snow would be 1/10 of an inch of precipitation. Different authorities give different conversion factors, ranging from 1 inch rain = 6 inches of snow to 1 inch rain = 15 inches of snow. From amount of rain and area. Our snow load calculator helps you to make the decision when to remove the snow from your roof by comparing the weight of snow with the load-carrying capacity of the roof. Other subcategories index Other calcs index: The catchment area is multiplied by the depth of rain that falls on it to give the total volume of water produced. Use our Rainfall Calculator to quickly determine how much rain has fallen in your location! Please note that the images are just an illustration of the snow risk and not an indication of how heavy any snow may be. Rainfall calculator (English units) ... both looking to the sky and hoping for rain. We will say that in theory the temperature would be 30 F. We can calculate the amount of equivalent snow using the formula above so S = 2*(5+30/16) = 2 * (6.875) = 13.75″ of snow at that temperature. Snow Day Calculator AccuWeather is a tool which lets you know the snow day of location according to accuweather. The snow to liquid ratio describes how much liquid would be obtained by melting a certain amount of snow. For more information about the weather in your location, please view the full weather forecast. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Factors such as evaporation, wetting, and soaking into the ground are not considered here. This can be done using a simple rain gauge, or looking up meteorological data for a specific storm or for an average storm. Compute the Weight of Snow on a Rectangular Area. Pour warm water into outer cylinder and allow snow to fully melt. During that storm the snow ratio was closer to 15 inches of snow to one inch of rain. For temperatures between 15 and 19 degrees Fahrenheit, multiply rainfall by 20. Richard Graham has worked professionally as both an economist and educator since 2007. Water, Rain and Snow Calculators: Compute the volume of water in snow or rain Compute the Weight/Mass of Snow on an Area. Consider removing accumulated snow from your roof to avoid collapse. Then, multiply the three dimensions together, or just use a volume calculator. Step Two: Figure the Snow Density. The Snow Day Calculator also offers text message notifications to notify users of their snow day chance further in advance. Measure how much you add to nearest hundredth of an inch! Unfortunately, life isn’t always that easy. Even a small amount of rain can turn into a serious snowstorm that accumulates several inches of snow on the ground and makes getting around difficult. Enter the total amount of rain precipitation in inches and the temperature to calculate the equivalent amount of snow. The calculated data is based on information from the National Weather Service that indicates the average snowfall is in a ratio of 10 inches of snow to 1 inch of equivalent rainfall. For example, to calculate the snowfall equivalent of 3 inches of rain, multiply 3 by 10 to obtain 30 inches of snow as the baseline conversion. Will's snow/rain calculator (too old to reply) Dave Cornwell 2015-01-21 12:06:35 UTC. This is saying that if 10 inches of snow fell and that snow was melted it would produce 1 inch of liquid precipitation in the rain gauge. This is where the snow-to-liquid ratio comes into play. Step One: Calculate the Volume of Snow The first step is to estimate the volume of snow, which can be done by multiplying the length and width in feet to find the area, then multiplying by the depth of the snow in feet. Now, obviously we could calculate this by trawling the archives, or we can use climatic reanalysis data to scan over 100 years or archived weather data around the world to find out which day of the year statistically snow is likely to begin to fall and also find out the day of the year which you are most likely to see the biggest dump (if you'll pardon the expression). Divide by 100 to get the rainfall in metres. At the base of clouds a melting layer forms where, ice particles melt and become rain, this is a fairly turbulent region containing a mixture of rain, ice and snow. The baseline ratio of rain to snow is 1 inch of rain equals 10 inches of snow. Rain, sleet, and ice add to the weight of existing snow. The following formula is used to calculate the amount of snow in inches from rain in inches. To calculate rain to snow for temperatures between 20 and 27 degrees Fahrenheit, multiply rainfall by 15 instead of 10. Capital Broadcasting Company: What is the Ratio of Snow to Rain in Inches. Between 10 and 14, multiply by 30; between 0 and 9, multiply by 40; between -20 and -1, multiply by 50, and between -40 and -21, multiply by 100. 5 years ago. Fortunately, it's easy to convert inches of rainfall to inches of snowfall to get a sense for what to expect and to be able to modify your plans accordingly. Or, maybe a low-pressure cell has been napping overhead, and your arm is hurting from holding that umbrella while you watch your basement fill up with water. Below you can find a little program to calculate the amount of rain water (precipitation) that will fall on a certain surface (your roof or premises). Either way, you would like to know how much rain has fallen—how many gallons have come down from the skies onto your roof, yard, block, or town. 1 4. Therefore, if 3 inches of rain are expected but the temperature drops suddenly to 5 degrees Fahrenheit, 120 inches of snow will fall. The calculated data is based on information from the National Weather Service that indicates the average snowfall is in a ratio of 10 inches of snow to 1 inch of equivalent rainfall. Therefore, 8 inches of snow that fell at 20 degrees Fahrenheit will melt down to approximately 0.53 inches of rain. Find the temperature in the location for which you'd like to perform the conversion. The equation for this is Rv = 0.05 + 0.009(I) where I is the percentage you calculated in section one, step three. Knowing how much rain has fallen into your rainwater catchment system is useful when you are projecting your water harvesting capabilities. There is lots of scatter and loss, this is called the “Bright band” by the weather radar community. Snow Risk Maps Updated four times a day the snow risk forecast maps, precipitation type maps and experimental snow depth maps are generated from GFS (global forecast system) data here at Netweather. This conversion applies for snow falling at temperatures near freezing, between 28 and 34 degrees Fahrenheit. Step One: Calculate the Snow Volume. 512-490-0932 501 W Powell Ln #206, Austin, TX 78753 | Harvesting Rain, Conserving Water, and Managing Stormwater in Texas Since 2004 Services Not only could the additional human weight cause the roof to collapse, but the slippery and unstable roof could be very dangerous. For example, to calculate the snowfall equivalent of 3 inches of rain at 5 degrees Fahrenheit, multiply 3 by 40 to obtain 120 inches of snow. Melt Snow in Rain Gauge Carefully pour melted snow sample back into the inner tube Measure to the nearest hundredth of an inch . TQ. Perform the baseline rain-to-snow conversion. Adjust your conversion to account for temperature if the outside temperature is less than or equal to 27 degrees Fahrenheit. This conversion applies for snow falling at temperatures near freezing, between 28 and 34 degrees Fahrenheit. Use this rainwater harvesting calculator to find the answer. A conversion chart that converts snowfall depths and amounts to the water equivalent How to Calculate Rain to Snow. How to Calculate Rain to Snow. For example, to calculate the snowfall equivalent of 3 inches of rain, multiply 3 by 10 to obtain 30 inches of snow as the baseline conversion. In fact, two feet of snow holds just a tiny fraction of the water produced by two feet of rain. Generally, the air temperature does need to be at or below freezing for snow to fall. The volume of snow is a major factor that contributes to the total weight. The baseline ratio of rain to snow is 1 inch of rain equals 10 inches of snow. We had 1.75 inches of "liquid equivalent," yet ended up with 23.2 inches of snow… You can also use a volume calculator for this task. Wind, for example, can compact snow and cause it to fall more densely, lowering the rain-to-snow ratio. Snow Ratios - Explained When we talk about snow quality, such as 'light and fluffy' or 'heavy and wet', we are talking about the snow-to-liquid ratio. A weather forecast for rain can quickly switch to one calling for snow if a sudden temperature drop occurs. In general, colder temperatures make snow fall less densely and lower the rain-to-snow ratio, resulting in more inches of snow per inch of rain. Many factors affect snow density apart from ambient temperature. The result is approximately 0.53 inches of rain. Click on Calculate. You can track down this info via the National Weather Service, for example, or any number of other meteorological sources, such as the Weather Channel. UK snow forecast: Shock weather chart shows UK will be battered by snow THIS WEEK SNOW is set to hit parts of the UK this week with regions in … Catchment area: Rainfall height: Water volume: Add . Please remember that the numbers given by this calculator are just an approximation and are by no means 100% accurate. Very cold snow will stand up even higher: one source says that at 15-19C, it takes 20 inches of snow to have the water content of 1 inch of rain. He also works as a consultant to small businesses and organizations focused on developing green technologies. One inch of rain will equal between 5-7 inches of snow depending on the temperature, Calculator Academy© - All Rights Reserved 2021, the westerlies bring rain and snow to the, T is the temperature in F (if the temperature is less than 0, leave this blanks). Melt Snow in Rain Gauge Snow in outer cylinder Add warm water to inner cylinder. Answer: This varies depending on the type of snow, but to make 1 inch of water (rain), you need 10 inches of average snow, 4 to 5 inches of wet snow, or 15 inches of powdery snow. Our calculator is also a good tool to use when you are still planning to build your rainwater catchment system. Usually the conversion goes toward rainfall, but if you wanted to convert to snow, in Canada we use a 1:10 ratio. For our example, we will use a 2.5 cm storm, or 0.025 m. Calculate the volumetric runoff coefficient, Rv. S = R * 5 + T/16 Where S is the amount of snow (inches) Propagation horizontally through it at high frequencies is bad news.