I recently stumbled onto a feature of Astrospheric called the "ensemble" forecast. Here's an image (this isn't the whole display ... but it is the main section that shows off the ensemble model). I had been using Astropheric for a while on the free tier and didn't know this feature (available in the Pro tier.)
This colorful display combines three models ... the Canadian Model (RDPS - this is the same model used by Clear Sky Chart), the North American Mesoscale (NAM) and the European model (same model used by Clear Outside (GFS).
Each model has a color assigned and you can see the color wheel in the left side of the chart.
RDPS (Canadian model) is blue
NAM (North American model) is green
GFS (European model) is red.
If two or more models agree then their colors are blended. E.g. Green + Red = Yellow ... so yellow would indicate that both NAM & GFS predict clouds but not RDPS. If all three models predict clouds you get white. If all three models predict clear then it's clear.
Below the chart are the hour-by-hour predictions (for the next three days) and you can click on any time slot you want to get the prediction for that hour. The top row of boxes are shaded for cloud-cover percent (dark blue is clear, the lighter the shade of blue ... all the way up to white is worse) as predicted by the RDPS (Canadian) model. There are two extra hash marks in each box and those represent NAM & GFS models.
This saves me time trying to track down the various forecasts *AND* it's updated consistently -- every 6 hours.
The downside is that the "ensemble" forecast is a feature of their "Pro" tier. That's $2.99/month or I think there is an option to pay $29/year. Still ... it is pretty nice to have all three forecast models in one
app *and* be able to pick any time slot you want for the next three days to get a visual of the cloud cover prediction.
The author does make this ensemble feature available free ... to star parties and to astronomy clubs if they meet certain conditions.