Porpetto (FVG) supercell, Sept 9, 2013

September 9th was the second day of a 3-day active pattern over the northern Adriatic with supercells forming in NE Italy plains. Conditions were favourable, with a 40 kt SW mid-level jet and up to 1500 J/kg CAPE. A strengthening southeasterly low-level wind would acompany a shortwave passage in the evening, increasing shear and helicity.

I started my run late in the afternoon as the northern FVG plain became active. By the time I arrived, a huge HP elevated mess had developed with several embeded mesocyclones. Several elevated wall clouds, but nothing seriously impressive.

After watching this show for about half an hour just NW of Palmanova I met up with Marko Korošec outside Ruda. We waited for quite a while for new storms to form, but at about 19:30 the newly forming cluster in the Alps north of the plain started exploding with activity. We raced northward towards the lightning barrage, stopping north of Porpetto. Soon an isolated supercell formed.

 Image

The supercell rapidly developed impressive structure – a massive wall cloud and inflow tail, beaver tail and mesocyclone striations. The inflow was quite impressive at about 40 km/h sustained, blasting into the supercell. The entire supercell was rotating spectacularly.

Image

Image

Image

Image

The wall cloud passed right overhead, with some impressive rotation visible.

Image

Image

We opted to let this supercell pass for the next one, forming to the west. The second one never really developed and turned out to be the last of the evening. Not bad though.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: