Location: Riga (Latvia) Date June 17-18 (2007) Time (UT) : 2220 - 2330 Elevation: 27Deg - 65 Deg Azimuth: 330 - 040 Brightness: There were two groups of NLCs a) brightness: 3 maybe even 4 (long cloud that is lower and more to the west) b) brightness: 1 maybe I could say even 2 (high wave like form)
Forms: I, IIa, IIb, IIIb, and maybe something more complicated
Spotted this display on June 17/18th once the clouds parted after days of overcast conditions. Observed from 23.55 - 02.40 UT as a type 3 brightness display extending from the W - E 160 degrees in azimuth and 120 degrees high. They climbed above my rooftop and into the zenith before dawn and smothered the Summer Triangle with a particularly nice crisscrossing complex in Ursa Major. The display was white-blue in colour and consisted of type I Veil, IIab very long bands with soft and sharp edges, IVc large scale whirls on the displays east and west flanks and S type knots where sections of the display met. Planet Mars was seen embedded in the display low in the NE but the most distinctive feature were several extremely long horizontal dark shadow bands near Capella the likes of which I have never seen before! Very good display!
I managed to see one lightning flash at the zenith Paul but the predicted thunderstorm never arrived as you said which was disappointing. I was actually hoping for a few breaks where I was planing on catching NLCs and lightning in the same image.
There is talk of clear breaks here tonight, but so far it's overcast.