![]() ![]() ![]() This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast. The colors are picked from what color the sky is likely to be, with The line, labeled Cloud Cover forecasts total cloud cover. Connected blocks mean one forecast calculation for several hours. (Local time for Boston is -4.0 hours from GMT.) Single blocks mean separate forecast data for each hour. A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "Sky", find a column of blue blocks. Summarizes CMC's forecast images just for BostonĪnd the surroundings out to about 10 miles. So, Attilla Danko wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Boston, MA, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the Lifeguards can give you advice on waves if you’re planning to go into the water.The Harvard College Observatory of Harvard University. ![]() If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore. If the arrow points towards land, most of the waves’ power will reach the beach. It indicates how sheltered the beach will be from these waves. The arrow shows the average direction of the waves 1-2 miles out to sea. Lifeguards can give you advice on waves if you’re planning to go into the water. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. This is the average number of seconds between one wave and the next, 1-2 miles out to sea. Read more about calculating the expected height of the waves at the beach. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away. The individual waves out to sea or at the beach can be higher than this number. This is the average height of the waves, 1-2 miles out to sea. 11 Extreme - Avoid being outside during midday hours. 8-10 Very high - Spend time in the shade between 11am and 3pm. 6-7 High - Seek shade during midday hours, cover up and wear sunscreen. 3-5 Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. No risk of UV - It’s safe to stay outside. UV exposure index and the protection required to help keep you safe: The higher the percentage of humidity, the wetter it will feel outside. If there is a lot of water vapour, the humidity will be high. Humidity is the amount of water vapor in the air. Visibility measures the distance at which an object can be clearly seen. Read more about how wind will affect you at the beach. The number is the average wind speed.īeware of offshore winds if you are using inflatables, paddle boards or kayaks. If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). ![]() The arrow shows the direction of the wind (up is north). The number represents the average wind speed expected at that time. The letters show the direction the wind is blowing from (on a standard 16-point compass). The arrow shows the direction the wind is blowing. Strong winds are shown in bold for speeds of 29 mph or more. Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull. This gives you a better idea of how the temperature will actually feel at the time. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.įeels like temperature considers other factors, such as wind speed and humidity. This number shows the air temperature for the time period. Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail and drizzle) will fall from the sky at a certain time. ![]()
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