Weather Forecast Sun July 12th : Flymaster Open - Macedonian and Hungarian Nationals 2026


Synoptic Overview

Barometric pressure tendencies indicate a weak cold front traversing the Kruševo region around midday on Sunday. This frontal system is projected to clear the Pelagonian valley after 15:00 LT.
Sky Condition & Cloud Development
  • Early Morning: Predominantly blue thermal conditions initially.
  • 11:00 LT: First Cumulus (Cu) formations visible to the west from launch. These cells will rapidly approach from the west, exhibiting both horizontal extension and vertical development.
  • 12:00 LT: Frontal cloud mass in close proximity to the site.
  • 13:00 LT: Complete overdevelopment (OD) and shading over all ridges surrounding the valley.
  • 14:00 LT: Cloud spread-out extending over the flats toward Prilep.
  • 15:00 LT: Localized convective showers developing and filling in from the northwest.
  • 18:00 LT: Frontal clearance with skies beginning to open up.
  • Cloud Base: Throughout this cyclical development, the cloud base will steadily rise, peaking above 3,000m AMSL. but drops after a second cycle after 17.00LT
Wind Profile
The frontal passage will trigger significant wind shifts across all layers:
  • Pre-frontal (Morning): Light easterly flow (<10 km/h) from the surface up to launch elevation.
  • 13:00 LT: Variable and converging winds, working from both sides of the ridge.
  • Mid-day: Surface flow shifting westerly, while a distinct NW flow (~20 km/h) prevails aloft.
  • Post-frontal (After 15:00 LT): The upper-level NW wind will mix down, becoming dominant at all altitudes down to valley floor levels. Later valley surface valley winds will switch to NE<15kph.
Soaring Conditions & Flight Potential
The soaring window will be brief and volatile. Conditions will start weak but will become increasingly usable after 12:00 LT.
  • 13:00 LT: Strong lift up to 2,000m.
  • 14:00 LT: Strong lift extending up to 2,800m. for thermals breaking the inversion level.
  • 15:00 LT: Peak thermal activity with integrated climb rates of +4 m/s up to 3,200m.
The front: Immediately following this peak, the frontal boundary hits. Conditions will rapidly deteriorate due to total overdevelopment  from the NW, incoming shade, collapsing lift, and high probability of localized showers.
Late Afternoon: After 17:00 LT, a secondary, weaker convective cycle will trigger, generating soft thermals and recycled Cumulus with bases just above 2,200m over the valley.
Flight Strategy & XC Potential
A 2-hour flight window is highly viable between 12:00 LT and 15:30 LT. Pilots utilizing this rapid convergence and strong pre-frontal lift have an estimated XC potential of 65–70 km.

65-70km.

More Details

Barometric pressure: Drops by 3mb from the previous day but further

Temperatures: 21-34 (DT=13 C) - good contrast for thermal triggering

Dewpoint: 9 C at Krusevo, 7 C at Prilep

Humidity low: 20%, higher to the NW area and Ochrida lake area

Humidity Boundary layer: 60% above Krusevo, 80% to the NW

Cloud base: Initially blue, later 2900m to the West, Krusevo 2500m after 15.00 at 3000m then drops

Cloud tops: initially +400m, later increases up to 6.000m around 15.00 to the NW.

Cloud types: Cu, CuCong, Showers

Cloud Coverage: North 100%, South at 40%, After 15.00h 100% high and low coverage at 100%

Inversion levels: 1300m, later 2000m increasing to 2500m at 15.00h. 

Energy flow: at 250w, meaning a relatively slow conditions evolution. After 15.00< 100w/m2

Average Thermal expected at 3m/s at 14.00h, and +1,5m/s at 17.00h to the second cycle

Thermal tops: West at 2.800m east at 2200-2500m, peak at 15.30h

Thermals at Altitude: +2m/s at 1000m, +3,5m/s at 1500m, +3,8m/s at 2000m

Ideal Thermal Zone: 1500m-3000m at peak of Conditions

Wind Gust at Surface: <10kph at 11.00h  E. Later swithces E and W at 10kph+, at 15.00 W 30kph+

0m: 10kph E later 20kph WNW

600m: E & W 10kph

1200m: E & W 10kph

1800m: W 10-15kph later WNW >20kph after 15.00

2400m WNW 10-15kph later NW 20kph

3000m WNW 15kph later WNW 28kph

3600m: WNW 25kph later WNW 30kph

Conditions start Organizing: at 12.00h. better at 13.00 peak at 15.00h, then drop fast.

Conditions decline after: 15.00h

Conditions Best Period: 14.00-15.00h

Conditions Peak time: 15.00h

Duration of Conditions: 2h

Calculated XC Speed: 32 kph

Expected XC Distance 65-70km

Convergence lines expected east of Prilep due to NW and NE winds at 15.00h

Rain Forecast: between 15.30 & 17.00h

Skew-T at 14.00h


Skew-T at 15.00h




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