You'll also get differences between the likes of Blitzortung and Strike Star EU because of the accuracy applied to the strike triangulation.
Blitz will normally show more strikes than Strike Star EU because, as I understand it, Blitz will confirm a strike on two stations triangulating where as in areas of good coverage Strike Star EU will rely on 3 or more stations confirming the strike.
There is also an error radius that Strike Star uses, this is normally no more that 40km so if the direction from two or more stations don't overlap within 40km of each other then the strike doesn't get counted.
It's worth checking a few of the sites to get an idea of exactly where the strikes are happening and, as Thunder God says, check those locations with the rainfall radar & satellite images.
With my Boltek (which is in the loft Grant
), I've found that I'm getting a good general direction on most storms when compared to Blitz or Strike Star but the distance is sometimes well out. The distance is only a calculation that the Boltek does to say where it 'thinks' the strike occurred.
I've picked up strikes in Spain but my Nexstorm software puts the strike between Falmouth & the Channel Islands where there are no clouds and other activity.
Much as I have tried to calibrate my Boltek, if you look at the raw data on Blitz then it only takes the "raw" distance data from my system, not the calibrated data, so there will be some instances where my data will nearly converge with others but the distance will be short so no strike is counted.
I hope this all makes sence.
And here's another site that maybe helpfull:
ATD Sferics