Manchester, NH – As winter weather continues across parts of New Hampshire, officials are reminding residents that accurate snowfall and rainfall measurements play an important role in forecasting and public safety.
According to the National Weather Service, proper precipitation measurements help meteorologists evaluate storm impacts, confirm radar estimates, and provide more accurate forecasts for communities statewide.
For snowfall, officials recommend measuring snow on a flat, open surface such as a snow board, deck railing, or an untreated piece of wood placed away from buildings and trees. Snow should be measured straight down with a ruler, ideally every six hours during an ongoing storm. When snowfall continues for extended periods, multiple measurements can be averaged to determine a reliable total.
Residents are advised to avoid measuring snow on grassy areas, sloped surfaces, or locations affected by drifting. Measuring compacted or shoveled snow can also lead to inaccurate results and should be avoided.
When measuring rainfall, a standard rain gauge placed in an open area offers the most accurate readings. If a rain gauge is not available, officials say a straight-sided container can be used, provided measurements are taken carefully and consistently.
During freezing rain events, forecasters may track ice accretion, which refers to the thickness of ice buildup on exposed surfaces. Ice is typically measured on flat metal objects or small tree branches and reported in inches.
The National Weather Service notes that public reports are especially valuable in areas where weather observation stations are spread far apart. Residents may be asked to submit snowfall, rainfall, or ice measurements through official reporting systems during active weather.
Officials emphasize that safety should always come first, and measurements should only be taken when conditions allow.
