Interesting, covid19 is impacting weather forecasts as well
https://www.theweathernetwork.com/ca/news/article/covid-19-decline-in-airline-flights-to-impact-weather-forecast-accuracy
Since weather is a very complex, chaotic system, forecasters use computer models to assist them in their day-to-day work. These computer models, in turn, rely on ingesting specific sources of information to produce their views of what the weather will be in the hours or days ahead. Readings taken by ground stations, ocean buoys and ships cover the surface conditions. Data from satellites tell what is going on in the upper levels of the atmosphere. To cover what is happening at the altitudes in between, scientists launch weather balloons from specific locations, a couple of times each day. More importantly, though, aircraft provide tens of thousands of reports based on the weather conditions they fly through while they are in the air.
The main impact of the loss of so many aircraft reports is expected in the forecasts for altitudes that these aircraft fly at, namely temperature and wind conditions at an altitude of 10–12 kilometres. The most significant impacts seen are in the first 24 hours of the forecast, with lesser impacts seen out to 7 days.
In of itself, this greater uncertainty in the forecast could have a direct impact on those flights that are still making trips, including those carrying goods and cargo between nations and continents.
Aircrafts apparently also play an important roll to pinpoint the exact location of the jet stream which has direct effects on local weather forecasts. Not that those are all that accurate anyway :p
