![]() ![]() ![]() This isn't an astronomy-specific forecast. ![]() Which is different than when the CMC forecasts update. It's here for comparison with the CMC cloud cover forecast.New data becomes available around 17:00 and 05:00 local time. It's data form the "european" forecast model ECMWF. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting 36 to 48 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future, 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 All Rights Reserved.The Harvard College Observatory of Harvard University. The WBZ Next Weather team will keep you updated and in the know as things develop. One thing is for sure, you will hear a LOT more about El Nino in the weeks and months to come, locally and globally. A lot will depend on the precise location and strength of the El Nino, something we will be watching over the next several months. A strong El Nino does not always mean a paltry snow year for us. If you are a snow lover or skier, don't go home yet. Some of our least snowy winters have correlated with strong El Nino's. In general, New England winters during an El Nino tend to be warmer and wetter than average. In New England, it often depends on the strength and location of the El Nino. Unfortunately, it is not a simple correlation.īelow, you can see what a typical El Nino winter looks like in the United States - warmer across much of the northern-tier and wetter to the south. Historically, strong El Nino's have had major impacts on our winters here in New England. The forecast is for a weak/developing El Nino this summer and for a moderate to strong El Nino by this fall and winter. Hence, most experts have called for a near normal hurricane season, taking a balance of the two opposing signals. This warm water is the main driver and fuel for developing tropical systems. However, the sea surface temperatures in the Caribbean and much of the Atlantic are also quite warm right now compared to averages. So, taken alone, this COULD mean a quieter hurricane season in 2023. WBZ-TV graphicĮl Nino causes a lot more wind shear in regions like the Gulf of Mexico and Caribbean, the regions where many of our hurricanes tend to form or strengthen. It's impacts locally in the summer are hard to quantify, but most times, El Nino's tend to suppress the Atlantic hurricane season. It also tends to raise the average global temperatures as well, often leading to record-setting high temperatures in many areas. El Nino often has major weather implications around the world from floods in some areas to droughts in others. ![]()
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