Αetheria Open 2025 Weather Forecast for Aug 2nd 2025

 

Summary of the Day forecast "High Instability and weak thermals below the inversion"

• The unstable and humid boundary layer means that we will have once again many clouds on the mountains and in the valley. 
• The day conditions may be weaker below the inversion of 1850m and the day will evolve slowly.
• Less on/off cycles, possibly one slow cycle that will peak at 18.00h with a thunderstorm expected 30km to the east valley
• A second inversion at 2600m will stop thermals at this peak altitude, above which there will be NW wind around 15kph
• Not significant South wind at the lower level <5kph
• Initial cloudbase at 1800m, later at 3000m above mountains.
• Average Thermals <1,7m/s below 1850 and 3m/s from 1850 to 2600m
• After 18.00h east wind will enter the area of Siatista.

Evangelos

More Details

Barometer & trend: drops by 1mb less density

Temperature range DT: 19-32 = 13 C hotter 1C day & less kinetic energy of air mass

Dewpoint / time:  7,5 C 

Humidity: same low and higher at B/L meaning more clouds with higher tops up to 5.000m at specific regions

Cloud base: Initially 1800, later up to 3000km at 15.00h

Cloud top: +2000m , higher than yesterday

Cloud types: Cu with spreadout, Cu Congestus , Shower clouds above higher ground after 17.00h

Cloud coverage: variable up to 80%

Average Thermal: <+2,5 m/s

Peak Thermal at Altitude: 1000m/+1,5m/s  , 1500m/+2,7m/s ,  2000m/ +3,2m/s

Top of Thermals: 1800-2700 m      

Best Thermal Zone: 1800-2500m 

Inversions: 1850m, 2600 shear 

Wind Gust: 17 kph at 15.00h, 

Ground average wind: S <5 kph

600m: S < 5 kph

1200m: S < 5 kph 

1800m:  S<5  kph 

2400m:  W<5 kph

3000m:  NW 10 kph 

3600m:  NW 18 kph

Day starts thermals at 13.00h later

Conditions start declining after 17.00h maybe earlier due to overdevelopment 

Best conditions Period 14.00-17.00h 

Peak thermal conditions at 17.00h

Task XC  duration 2,5 h 

Calculated XC speed 15-35 kph 

Potential Day task 70 km max 

Rain possibility 0%