Forecast hour +3
Fri 30 Oct, 10:10
Generated 07:17Weather detail
- Forecast assessment
- Upper wind range remains below 18 kt and gusts remain below 25 kt.
- Wind change
- Steady (-1.2 kt)
- Direction-change risk
- 0%
- Weather regime
- Showery / unstable
- Provider agreement
- Strong agreementSource wind spread 0.3 kt; direction spread 13°.
- Selected sources
- Met Office 100%
Gust probability
18+ kt97%
20+ kt93%
25+ kt61%
30+ kt12%
TBSC course selection
Short course180° magnetic
Why this course set?Short selected because the forecast mean is 13.1 kt and gust 22.5 kt, outside the Force 3-4 band; the card uses Short for Force 1-2 or Force 5 conditions.The 172 degree true forecast converts to approximately 173 degrees magnetic and uses the nearest 15 degree matrix column: 180 degrees.
| Fleet | Course |
|---|---|
| Oppy 2 | 1Y |
| Optimist | 2 |
| Feva | 11 |
| Slow Misc | 11 |
| Myth | 11 |
| Misc | 23 |
| 1/2 Rater | 23 |
| Start | Red reverse |
Wind-based selection; shorten for poor visibility, rough sea or other race-management concerns.
Trearddur Bay Sailing Club
Sailing area
Fri 30 Oct, 10:10 · Wind S 172 deg T at 13.1 kt, gust 22.5 kt · Short course, 180 deg magnetic
Course overlay ready
Course 1YOppy 2Route diagram referenced as page 27 but not included in the supplied scan
Why: The 2026 selector assigns Course 1Y 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 2Optimist4 rounds · Outer Bay · start Red
Why: The Short matrix at 180 degrees magnetic assigns Course 2 to Optimist. The normal published mark sequence applies. 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 11Feva4 rounds · Green Bay · start Red
Why: The Short matrix at 180 degrees magnetic assigns Course 11 to Feva. The normal published mark sequence applies. 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 11Slow Misc, Myth4 rounds · Outer Bay · start Red
Why: The Short matrix at 180 degrees magnetic assigns Course 11 to Slow Misc, Myth. The normal published mark sequence applies. 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 23Misc3 rounds · Green Bay · start Red
Why: The Short matrix at 180 degrees magnetic assigns Course 23 to Misc. The normal published mark sequence applies. 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 231/2 Rater3 rounds · Inner Bay · start Red
Why: The Short matrix at 180 degrees magnetic assigns Course 23 to 1/2 Rater. The normal published mark sequence applies. 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 | 14.3 kt | 25.2 kt | SSE 159° |
| Met Office | 14.6 kt | 22.4 kt | S 172° |
| Persistence | 14.3 kt | 25.2 kt | SSE 159° |
| Residual Shadow | 13.9 kt | 22.8 kt | S 172° |
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.