Αetheria Open 2025 Weather Forecast for July 29th 2025

 

Summary of the Day forecast 

Local low remains in the area although barometer increases 1mb. This means a slightly more strong inversion comparing to yesterday. 

Humidity at low altitude remains low and temperature contrast remains high assuming good thermal triggering close to the ground especially to the east side of Siatista valley.

Humidity at high altitude is increased to 65% from 35%, meaning that we expect similar cloudbase but more clouds comparing to yesterday.

Thermals will be strong enough at 3,1m/s average, expected smoother than yesterday and less bumpy close to the inversion level of 2300m at 15.00, similar to yesterday.

Thermals weaker by 0,5m/s but better organized and smoother close to inversion.

Close to Kastoria we expect >70% Cloud coverage.

Two Convergence lines are expected from West to east, one over Grevena and one next to Kastoria.

Evangelos

More Details

Barometer & trend: 1mb increase - remains low

Temperature range DT: 19-31 = 12 C assuming good thermal triggering on ground

Dewpoint / time: increases fro 6,5 C to 9,5 C 

Humidity: 28% below the inversion and 65% withing the whole boundary layer

Cloud base: expected at 2700 early, later 3000m and after 15.00 increases to 3300m

Cloud top: +500m 

Cloud types: Cu with spreadout close to Kastoria 30Km North

Cloud coverage: 20% Siatista, and 70% at Kastoria area with convergence clouds and spread out.  

Average Thermal: +3,1 m/s

Peak Thermal at Altitude: 1000m/+2,5m/s (less) , 1500m/+3,5m/s (less),  2000m/ +4,1m/s+ (less)

Top of Thermals: early up to the inversion of 2300, later 3000m, after 15.00 3300m.        

Best Thermal Zone: 1500-2500m (less)

Inversions: 2300m

Wind Gust: 27kph at 15.00h

Ground average wind: WNW 12kph

600m: WNW 12 kph

1200m: W 13kph

1800m: W 15 kph

2400m: W 18 kph

3000m: W 22 kph 

3600m: W 25 kph

Day starts organising thermals at 13.00h, 1h later than yesterday 

Conditions start declining after 18.00h 

Best conditions Period 14.30-17.00h 

Peak thermal conditions at 16.00h

Task XC  duration 3 h 

Calculated XC speed 30 kph 

Potential Day task 90km

Rain possibility 0%