This is Scientific American's 60-second Science, I'm Julia Rosen.Here are two things that you probably didn't think were connected: the COVID-19 pandemic and weather forecasts.But there is a link: commercial air travel.As jetliners carry passengers around the world, they also collect vital weather measurements, like air temperature and wind speed.During the pandemic, however, air travel has come almost to a halt."In February, let's say, we have 100 percent. And then in March we go down by half. And April go down by another half.So currently, possibly, we just have one quarter of aircraft running. So you can imagine the gap of observations."Ying Chen, a meteorologist at the University of Lancaster in England.To create weather forecasts, meteorologists need to feed accurate information about current weather conditions into their models.And planes are one of the best ways to get such info, since they sample the atmosphere at different altitudes and locations.But with the coronavirus grounding flights around the world, meteorologists are feeling the loss."I analyzed three months of spring, which is March, April and May. And I see temperature, wind speed―forecast accuracy all goes down."Forecast quality declined the most for long-range projections and over remote areas where planes are one of the few sources of data.In Greenland, for example, the accuracy of temperature forecasts has decreased by as much as 3.5 degrees Fahrenheit.