After morning front passage including heavy thunderstorm with downpours there was a quite sunny day, looking towards N-NE (Time: 12:26 UTC):

Clouds were rising fastly into Cumulus congestus forms...(Time: 13:51 UTC):

A view towards NW (towards Friuli and Dolomite Alps) shows those cells from a radar image above (Time: 14:13 UTC):

Those cells with possible hail in central Friuli are great visible on the radar image:

In the late afternoon the center od cyclone with lowest pressure was around 100km W-SW from me:

This center is really great visible from the satelite, there are many cells around Northern Mediteranean Sea:

In the next hours the lowest pressure shifted ~50km towards East. As we can see on this map the wind at geopotential height 850hPa was already turning into NNE direction over NW Slovenia and NE Italy, over S-SW Slovenia there was a slight W-SW wind:

A location of cyclone with clouds in spiral lines are great visible on this IR satelite images:

A couple of sun hours in this unstable air caused a good chance to get some storms over S-SW Slovenia as well.
Forecast said that in the afternoon CAPE will be around 800J/kg and Lifted Index around -2 to -3°C.

The location of lowest cyclone pressure was in good position, so with the wind mentioned above it all started to move back to me (from E-NE towards W-SW), so in the opposite directions like in the morning. Combination with strong convection caused the first strong cells with possible hail were formed over the hills (Nanos, Caven, Vremscica) towards SE-E-NE-N from my location, which is marked with blue dot. The radar shows reflectivity above 55dBz in those cells:

This is a well developed cell E-SE from me. This cell produced hail which is excelently seen on above image (Time: 14:46 UTC):

In the next hour these strong cells slowly merged into a minor MCS over SW Slovenia including Karst. Radar image shows an intense cell ~5km SE from me, where was a heavy downpours with approx. 2cm hail in diameter which covered ~5cm layer on the ground.

This pic shows how the system looks like, this is a view towards that strong cell mentioned above (Time: 15:39 UTC):

I quickly found a better location to see the whole system, which looked excelent!
View towards E (Time: 15:45 UTC):

View towards SE, a front-line with Cb arcus is progressing towards W-SW over hill Vremscica (time: 15:49 UTC):

View towards NE (time: 15:49 UTC):

The system was now moving towards me from E-NE directions, rain was closer and closer (Time: 15:56 UTC):

10 min later I had a strong cell with downpour just in front of me in NE direction, approx. 2km away:

This cell looks pretty cool with fallstreaks of rain and approaching fast (Time: 15:59 UTC):

A closer view to these failstreaks of rain a bit later (Time: 16:01 UTC):

Looking towards North (towards hill Caven), a nice Cb arcus formed (Time: 16:03 UTC):

Closer view to this arcus (Time: 16:03 UTC):

A view towards SW shows how dark clouds (Cb mam or "whale's mouth" forms) are progressing towards Trieste where it was still sunny (Time: 16:13 UTC):

There was also many lightning strikes in this storms, I managed to catch one over the hill Vremscica. Remember, it was a daylight! (Time: 15:46 UTC):

This two images show lightning activity from 15:50 to 16:18 UTC over W-SW Slovenia:

Then it started to rain haavily, which shows this radar image:

Accumulated rainfall was 20 to more than 50mm in these couple of hours:

All images in this chase log are also in my galery.

Radar, satellite and other images are taken from websites: OSMER, NASA, MeteoNetwork, Weather Online and Alpenflugwetter.com.

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