MDISA Keelboat Qualifier @ Annapolis Yacht Club

# SchoolTeam A TOT
1 Archbishop Spalding Archbishop Spalding Cavaliers 12 12
2 Severn School Severn School Admirals 12 12
3 Key School Key School Zags 14 14
4 St. Mary's High School (MD) St. Mary's High School (MD) Saints 24 24
5 Leonardtown High School Leonardtown High School Raiders 27 27
6 Sts. Peter & Paul Sts. Peter & Paul Sabres 34 34
7 Jackson-Reed High School Jackson-Reed High School Tigers 40 40
8 Broadneck High School Broadneck High School Bruins 40 40
9 Annapolis High School Annapolis High School Panthers 41 41
10 Severna Park Severna Park Falcons 42 42
11 Indian Creek School Indian Creek School Eagles 44 44
SchoolTeam R1 R2 R3 R4 R5 TOT
Archbishop Spalding Archbishop Spalding Cavaliers 1 1 5 1 4 12
Severn School Severn School Admirals 2 3 2 4 1 12
Key School Key School Zags 3 5 1 2 3 14
St. Mary's High School (MD) St. Mary's High School (MD) Saints 5 2 7 3 7 24
Leonardtown High School Leonardtown High School Raiders 10 7 3 5 2 27
Sts. Peter & Paul Sts. Peter & Paul Sabres 4 10 9 6 5 34
Jackson-Reed High School Jackson-Reed High School Tigers 6 4 10 10 10 40
Broadneck High School Broadneck High School Bruins 9 9 4 7 11 40
Annapolis High School Annapolis High School Panthers 7 6 11 9 8 41
Severna Park Severna Park Falcons 11 8 6 11 6 42
Indian Creek School Indian Creek School Eagles 8 11 8 8 9 44

Performance rating asks, for each skipper: holding every other boat fixed, which rating makes my actual race-by-race finishes least surprising? Boats are valued with the keelboat rating rather than the fleet rating: 0.41 × the skipper's fleet rating from the week before the event (unrated skippers start at 0.47); 0.28 × the mean fleet rating of the rated crew aboard; the skipper's own keelboat offset; the school's program effect. Non-finishes (OCS, DNF and similar) are left out of the fitting, as in the rating model.

Percentile places a rating among the 78 ISSA sailors with a keelboat rating who raced the discipline in the last three seasons. Surprise is how many bits more surprising the finishes were at the pre-event rating than at the performance rating. P(this good or better) simulates the event 3,000 times at the pre-event ratings, with the same regatta-form model as the fleet analysis pages, and reports how often the skipper would score this many points or fewer in the races they sailed.

The keelboat offsets are the current ones (the discipline files keep no weekly history), so a skipper's own offset has already seen this event; offsets are shrunk hard, so the effect is a few hundredths at most. Only skippers are rated.

Division A  11 boats · 5 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Owen MacWilliams '24Archbishop Spalding5/51.502.77+1.2692nd → 99th2.96%2.4 / 5.1
1Will Friedell '24Severn School5/52.122.82+0.7099th → 99th1.020%2.4 / 3.9
3Mason Cook '25Key School5/51.942.53+0.5899th → 99th0.723%2.8 / 4.3
4Jack Powers '24St. Mary's High School (MD)5/51.161.49+0.3383rd → 92nd0.335%4.8 / 5.7
5Joseph Murphy '24Leonardtown High School5/51.201.09−0.1188th → 77th0.047%5.4 / 5.7
6Hartley Cooper '26Sts. Peter & Paul5/50.830.71−0.1267th → 55th0.060%6.8 / 6.3
7Hayden Clary '24Broadneck High School5/50.760.18−0.5860th → 13th0.979%8.0 / 6.5
7William Lindsley '24Jackson-Reed High School5/50.490.26−0.2337th → 19th0.170%8.0 / 7.0
9James Ronayne '24Annapolis High School5/50.440.21−0.2233rd → 17th0.172%8.2 / 7.1
10Peter Judge '25Severna Park5/50.46-0.14−0.5936th → 1st0.876%8.4 / 7.1
11Conor Mastromarco '26Indian Creek School5/50.330.14−0.1924th → 12th0.179%8.8 / 7.3

Conditions — 10/09/2023 (8am–6pm)

🌤️Partly cloudy
Humidity 53%  ·  Pressure 1009.9 hPa

Temperature

58°F
↑ 63°F   ↓ 47°F
Feels like 54°F

Wind

● from   ▲ toward
5.9 kn
avg  ·  max 7.9 kn
Gusts to 19.8 kn
From WSW (241°)

Sky & Precipitation

Cloud cover58% Sunshine9.1 hrs Humidity53% Pressure1009.9 hPa

What this breeze does at Annapolis Yacht Club — from fleet racing

Breeze: SW about 8 kn (weather reanalysis in the scorer’s units)
In fleet races at Annapolis Yacht Club in this breeze: an underdogs’ day (−0.09)
Underdogs’ conditions: in fleet racing here the fleet bunches up and lower-rated boats beat the seeds more often than usual.

Orderliness is how tightly a fleet race’s finishing order follows the pre-regatta ratings, relative to a typical event (0): positive is the favourites’ day, negative the underdogs’. A value of ±0.09 means a rating gap counts about 8% less than on a typical day. This event is not a fleet race the rating model scores, so there is no actual value for it: this is what this venue’s fleet racing history says about the breeze on the day, read off the chart at the star. How this is estimated · compare venues.

Orderliness beyond the fleet at Annapolis Yacht Club by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 1 labelled days at Annapolis Yacht Club, so the surface is mostly the all-venue pattern).

From the notes

Short write-ups of what the ratings and results show, with the numbers and how they were computed.

All notes →