Forecast hour +5
Mon 24 Aug, 04:10
Generated 23:17Weather detail
- Forecast assessment
- Upper wind range remains below 18 kt and gusts remain below 25 kt.
- Wind change
- Steady (0.8 kt)
- Direction-change risk
- 0%
- Weather regime
- Stable high pressure
- Provider agreement
- Moderate agreementSource wind spread 2.0 kt; direction spread 24°.
- Selected sources
- Met Office 100%
Gust probability
18+ kt6%
20+ kt3%
25+ kt1%
30+ kt0%
TBSC course selection
Short course75° magnetic
Why this course set?Short selected because the forecast mean is 4.5 kt and gust 11.0 kt, outside the Force 3-4 band; the card uses Short for Force 1-2 or Force 5 conditions.The 69 degree true forecast converts to approximately 70 degrees magnetic and uses the nearest 15 degree matrix column: 075 degrees.
| Fleet | Course |
|---|---|
| Oppy 2 | 1W |
| Optimist | 3R reverse |
| Feva | 8R reverse |
| Slow Misc | 8R reverse |
| Myth | 8R reverse |
| Misc | 20R reverse |
| 1/2 Rater | 20R reverse |
| Start | Red reverse |
Wind-based selection; shorten for poor visibility, rough sea or other race-management concerns.
Trearddur Bay Sailing Club
Sailing area
Mon 24 Aug, 04:10 · Wind ENE 69 deg T at 4.5 kt, gust 11.0 kt · Short course, 75 deg magnetic
Course overlay ready
Course 1WOppy 2Route diagram referenced as page 27 but not included in the supplied scan
Why: The 2026 selector assigns Course 1W to Oppy 2 for this course length and magnetic-bearing column. Its route refers to page 27, which was not included in the supplied scan.
Course 3ROptimist4 rounds · Outer Bay · start Red
Why: The Short matrix at 075 degrees magnetic assigns Course 3R to Optimist. The R suffix selects the published reverse mark sequence. The route starts at the midpoint of the Red line, uses Outer Bay as its Bay Mark and finishes at the midpoint of the white line.
Course 8RFeva2 rounds · Green Bay · start Red
Why: The Short matrix at 075 degrees magnetic assigns Course 8R to Feva. The R suffix selects the published reverse mark sequence. The route starts at the midpoint of the Red line, uses Green Bay as its Bay Mark and finishes at the midpoint of the white line.
Course 8RSlow Misc, Myth2 rounds · Outer Bay · start Red
Why: The Short matrix at 075 degrees magnetic assigns Course 8R to Slow Misc, Myth. The R suffix selects the published reverse mark sequence. The route starts at the midpoint of the Red line, uses Outer Bay as its Bay Mark and finishes at the midpoint of the white line.
Course 20RMisc1.5 rounds · Green Bay · start Red
Why: The Short matrix at 075 degrees magnetic assigns Course 20R to Misc. The R suffix selects the published reverse mark sequence. The route starts at the midpoint of the Red line, uses Green Bay as its Bay Mark and finishes at the midpoint of the white line.
Course 20R1/2 Rater1.5 rounds · Inner Bay · start Red
Why: The Short matrix at 075 degrees magnetic assigns Course 20R to 1/2 Rater. The R suffix selects the published reverse mark sequence. The route starts at the midpoint of the Red line, uses Inner Bay as its Bay Mark and finishes at the midpoint of the white line.
The blue wind arrow points downwind; its label states the direction the wind comes from. Each coloured course begins at the midpoint of its selected Red or G/W start line and ends at the midpoint of the white finish line. Coloured arrowheads show the order of travel. Lines show the mark sequence once; follow the number of rounds in the key. Published port/starboard rounding instructions remain authoritative.
Forecast sources
| Source | Wind | Gust | Direction |
|---|---|---|---|
| Local | 3.6 kt | 6.1 kt | NE 45° |
| Met Office | 5.7 kt | 13.0 kt | ENE 69° |
| Persistence | 3.6 kt | 6.1 kt | NE 45° |
| Residual Shadow | 8.1 kt | 16.1 kt | ENE 69° |
Guidance only. The race officer's decision, current observations, sea state, visibility, tide, official warnings and local safety procedures take precedence over this experimental forecast.