Forecast hour +2
Mon 24 Aug, 01:10
Generated 23:17Weather 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
- Stable high pressure
- Provider agreement
- Moderate agreementSource wind spread 2.6 kt; direction spread 5°.
- Selected sources
- Historical Differential 100%
Gust probability
18+ kt1%
20+ kt1%
25+ kt0%
30+ kt0%
TBSC course selection
Short course45° magnetic
Why this course set?Short selected because the forecast mean is 2.5 kt and gust 6.9 kt, outside the Force 3-4 band; the card uses Short for Force 1-2 or Force 5 conditions.The 50 degree true forecast converts to approximately 51 degrees magnetic and uses the nearest 15 degree matrix column: 045 degrees.
| Fleet | Course |
|---|---|
| Oppy 2 | 1Y |
| Optimist | 3R reverse |
| Feva | 5R reverse |
| Slow Misc | 5R reverse |
| Myth | 9R reverse |
| Misc | 9R reverse |
| 1/2 Rater | 17R 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, 01:10 · Wind NE 50 deg T at 2.5 kt, gust 6.9 kt · Short course, 45 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 3ROptimist4 rounds · Outer Bay · start Red
Why: The Short matrix at 045 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 5RFeva4 rounds · Green Bay · start Red
Why: The Short matrix at 045 degrees magnetic assigns Course 5R 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 5RSlow Misc4 rounds · Outer Bay · start Red
Why: The Short matrix at 045 degrees magnetic assigns Course 5R to Slow Misc. 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 9RMyth2 rounds · Outer Bay · start Red
Why: The Short matrix at 045 degrees magnetic assigns Course 9R to 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 9RMisc2 rounds · Green Bay · start Red
Why: The Short matrix at 045 degrees magnetic assigns Course 9R 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 17R1/2 Rater1.5 rounds · Inner Bay · start Red
Why: The Short matrix at 045 degrees magnetic assigns Course 17R 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° |
| Historical Differential | 3.7 kt | 8.1 kt | NE 50° |
| Met Office | 6.3 kt | 15.0 kt | NE 50° |
| Persistence | 3.6 kt | 6.1 kt | NE 45° |
| Residual Shadow | 6.0 kt | 15.2 kt | NE 50° |
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.