I don't know what TP and LP are, but yes, cloud base is 300m above AGL. If you go above 300m, you are more likely to encounter clouds, though if the cloud cover is not 100% the air might still be clear up there depending on where you are and where the clouds are. If you try to fly through a cloud, visibility will drop to almost zero (I am speaking from experience!) and your quad is likely to get wet, which is generally a bad idea.
The Kp index, by definition, is for the entire planet and does not vary by location (the "p" in Kp actually stands for "planetary"). So there is only one Kp value, for everywhere on Earth. The effect that the Kp index has on GPS satellite reception does vary depending on latitude and time of day, and UAV Forecast takes those factors into account and shows the combined effect in the "Estimated Satellites Locked" column.
Please send a copy of your iTunes receipt to email@example.com, so I can recreate the subscription manually. (This happens because Apple does not support "Restore Purchases" for subscription purchases.)
I have wind altitude set at 20 feet. My anemometer is on the roof - at 20 feet.
I just looked at the info on the link you provided. We currently have winds at 16, gusting to 23 - across several stations in the community - the airport east of me, and the Air Force Base within 6 miles west of me. Currently, the UAV app is tracking here but that wind data at the link - is NOT tracking any station in this area. Interesting.
What is your location? What settings are you using for the thresholds, particularly for the probability of precipitation? Were you using the app or the website? Can you send a screenshot? What time of day and what date did you see this on?
It is very rare for UAV Forecast to show only 6 satellites in the sky. What is your location? Can you send me a screenshot which includes your location and shows the 6 satellites? The data is derived from regularly updated ephemeris data of the orbits of GPS satellites and is very reliable. However, a lot depends on how much of the sky you can see from your location. If you are surrounded by tall buildings, you are not going to be able to establish direct line-of-sight to all the satellites that are above the horizon. This is the purpose of the "GPS Elevation Mask" setting in the app and on the site. If the app is showing only 6 satellites available, it is possible you are using too high a value for this GPS Elevation Mask. Ideally, you'd set it to the average angle of the buildings around you relative to the horizon, i.e. when surrounded by tall buildings, set it to 20 or 30 degrees; when in an open field with a full view of the sky, set it to 0 or 5 degrees.