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Past
Conditions
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| Thomas Point Lighthouse
is operated by the National Data Buoy
Center, a part of the National Weather Service. Since Thomas Point Lighthouse is located 8 miles south of the Chesapeake
Bay Bridges (see map below), it is an excellent source of important information about the conditions
that swimmers encounter during the Great Chesapeake Bay Swim (GCBS), especially the water
temperature and wind
magnitude and direction. |
|
Start
of GCBS:
Finish of GCBS:
Thomas Point Lighthouse: |
39:00:29N
76:24:08W
38:58:55N 76:20:06W
38:53:54N 76:26:12W |
|
|
Click
here for more buoys. |
|
Previous Bay
Swim Conditions |
| |
Temp, (°F) |
Wind |
|
Year |
Water |
Air |
mph |
Direction |
|
2023 |
69 |
71 |
7 |
SW |
|
2022 |
72 |
70 |
7 |
ESE |
|
2019 |
73 |
73 |
26 |
ENE |
|
2018 |
72 |
73 |
5 |
E |
|
2017 |
72 |
73 |
8 |
SSE |
|
2016 |
72 |
87 |
25 |
WNW |
|
2015 |
77 |
80 |
8 |
S |
|
2014 |
73 |
73 |
12 |
SSE |
|
2013 |
71 |
71 |
7 |
NE |
|
2012 |
74 |
78 |
3 |
N |
|
2011 |
77 |
79 |
3 |
E |
|
2010 |
74 |
74 |
9 |
S |
|
2009 |
74 |
70 |
11 |
NE |
|
2008 |
72 |
79 |
9 |
S |
|
2007 |
75 |
69 |
6 |
E |
|
2006 |
69 |
62 |
13 |
WNW |
|
2005 |
75 |
75 |
13 |
SSE |
|
2004 |
71 |
67 |
15 |
SSW |
|
2003 |
64 |
63 |
4 |
NNE |
|
2002 |
72 |
73 |
11 |
SW |
|
2001 |
71 |
73 |
6 |
SE |
|
2000 |
71 |
76 |
10 |
SSE |
|
1999 |
71 |
69 |
15 |
NNE |
|
1998 |
67 |
74 |
18 |
WNW |
|
1997 |
63 |
60 |
9 |
NNE |
|
1996 |
69 |
71 |
15 |
SSE |
|
1995 |
73 |
77 |
12 |
SSE |
|
1994 |
71 |
71 |
14 |
SSE |
|
1993 |
72 |
66 |
9 |
ENE |
|
1992 |
72 |
69 |
8 |
N |
|
1991 |
71 |
71 |
9 |
N |
|
1990 |
70 |
74 |
13 |
WNW |
|
1989 |
70 |
63 |
19 |
WNW |
|
1988 |
66 |
67 |
19 |
W |
|
1987 |
71 |
70 |
6 |
SSE |
|
1986 |
75 |
74 |
11 |
SSE |
|
|
Key to Wind Direction |
Wind
Direction
(WD) |
Degrees
clockwise from North |
North |
0 |
NNE |
23 |
NE |
45 |
ENE |
68 |
East |
90 |
ESE |
113 |
SE |
135 |
SSE |
158 |
South |
180 |
SSW |
203 |
SW |
225 |
WSW |
248 |
West |
270 |
WNW |
293 |
NW |
315 |
NNW |
338 |
North |
360 |
|
|
|
|
The above water, air, and wind conditions
were calculated from TPLH
Historical Data: |
GCBS
Year |
Sunday,
June |
Start
Time |
Thomas Point Lighthouse Measurements
(see definitions below) |
|
Time* |
WD |
WSPD |
GST |
BAR |
ATMP |
WTMP |
|
2023 |
11 |
8:00AM |
8:00 AM |
225 |
6 |
8 |
1010.8 |
20.7 |
21.6 |
|
2022 |
12 |
1:30 PM |
1:00 PM |
147 |
7 |
7 |
1013.2 |
20.9 |
22.0 |
|
2019 |
9 |
12:30 PM |
1:00 PM |
60 |
11.8 |
12.9 |
1022.1 |
22.8 |
22.6 |
|
2018 |
10 |
10:30 AM |
noon |
85 |
2.3 |
2.5 |
1016.9 |
23.0 |
22.3 |
|
2017 |
11 |
8:30 AM |
10:00 AM |
160 |
3.6 |
3.6 |
1020.2 |
22.6 |
22.0 |
|
2016 |
12 |
12:15 PM |
2:00 PM |
290 |
11.3 |
11.8 |
1007.4 |
30.7 |
22.4 |
|
2015 |
14 |
12:15 PM |
2:00 PM |
180 |
3.6 |
4.1 |
1018.0 |
26.8 |
24.8 |
|
2014 |
8 |
10:30 AM |
noon |
157 |
5.3 |
5.6 |
1015.0 |
23.0 |
22.8 |
|
2013 |
9 |
8:25 AM |
10:00 AM |
50 |
3.1 |
3.6 |
1023.0 |
21.8 |
21.9 |
|
2012 |
10 |
11:00 AM |
noon |
350 |
1.5 |
3.1 |
1019.4 |
25.3 |
23.1 |
|
2011 |
12 |
11:30 AM |
1:00 PM |
80 |
1.2 |
1.5 |
1011.1 |
25.9 |
25.0 |
|
2010 |
13 |
8:00 AM |
9:00 AM |
177 |
3.9 |
4.7 |
1012.0 |
23.5 |
23.3 |
|
2009 |
14 |
10:20 AM |
noon |
55 |
5.0 |
5.6 |
1015.6 |
21.3 |
23.5 |
|
2008 |
8 |
10:00 AM |
11:00 AM |
174 |
4.2 |
4.4 |
1016.4 |
25.9 |
22.1 |
|
2007 |
10 |
9:30 AM |
11:00 AM |
100 |
2.6 |
2.9 |
1017.0 |
20.6 |
23.8 |
|
2006 |
11 |
10:00 AM |
11:00 AM |
295 |
5.9 |
7.7 |
1011.8 |
16.5 |
20.7 |
|
2005 |
12 |
10:30 AM |
noon |
160 |
5.8 |
6.2 |
1018.5 |
24.1 |
23.9 |
|
2004 |
13 |
9:30 AM |
11:00 AM |
198 |
6.7 |
7.5 |
1024.1 |
19.3 |
21.5 |
|
2003 |
8 |
12:30 PM |
2:00 PM |
22 |
1.8 |
2.1 |
1012.9 |
17.4 |
18.0 |
|
2002 |
16 |
11:00 AM |
noon |
227 |
4.9 |
5.9 |
1009.0 |
22.7 |
22.0 |
|
2001 |
10 |
10:30 AM |
noon |
140 |
2.6 |
2.6 |
1014.1 |
22.7 |
21.5 |
|
2000 |
11 |
9:45 AM |
11:00 AM |
168 |
4.5 |
4.7 |
1019.2 |
24.2 |
21.5 |
|
1999 |
13 |
7:15 AM |
9:00 AM |
31 |
6.8 |
7.5 |
1021.2 |
20.4 |
21.8 |
|
1998 |
14 |
10:50 AM |
noon |
297 |
8.2 |
9.9 |
1001.7 |
23.2 |
19.5 |
|
1997 |
8 |
10:00 AM |
11:00 AM |
21 |
3.8 |
4.1 |
1021.6 |
15.8 |
17.3 |
|
1996 |
9 |
8:30 AM |
10:00 AM |
149 |
6.6 |
7.4 |
1019.3 |
21.8 |
20.5 |
|
1995 |
11 |
1:00 PM |
2:00 PM |
154 |
5.4 |
5.8 |
1012.7 |
24.7 |
22.7 |
|
1994 |
12 |
10:00 AM |
11:00 AM |
168 |
6.1 |
6.6 |
1018.9 |
21.7 |
21.6 |
|
1993 |
13 |
9:15 AM |
11:00 AM |
72 |
3.9 |
4.1 |
1024.7 |
18.8 |
22.1 |
|
1992 |
28 |
8:30 AM |
10:00 AM |
352 |
3.5 |
4.0 |
1015.1 |
20.4 |
22.1 |
|
1991 |
9 |
8:05 AM |
9:00 AM |
1 |
3.8 |
3.9 |
1022.0 |
21.8 |
21.7 |
|
1990 |
10 |
8:00 AM |
9:00 AM |
296 |
5.7 |
6.9 |
1011.9 |
23.3 |
21.1 |
|
1989 |
11 |
8:00 AM |
9:00 AM |
292 |
8.7 |
10.5 |
1021.0 |
17.3 |
21.2 |
|
1988 |
12 |
8:00 AM |
9:00 AM |
276 |
8.4 |
9.3 |
1020.0 |
19.6 |
18.8 |
|
1987 |
14 |
8:00 AM |
9:00 AM |
160 |
2.6 |
2.6 |
1013.2 |
21.2 |
21.4 |
|
1986 |
15 |
10:00 AM |
11:00 AM |
160 |
5.1 |
5.1 |
1019.7 |
23.2 |
23.8 |
|
Definitions of standard
meteorological data measurements:
ATMP Air temperature (Celsius) at 17.4 meters
above sea level
WTMP Sea surface temperature (Celsius), °F =
1.8(°C) + 32
BAR Sea level barometric pressure (mb), 100 mb
= 29.53 inches of mercury
WSPD Hourly average wind speed (m/s), 1 m/s =
2.237 mph = 1.9425 knots (US)
WD Hourly average wind direction (degrees
clockwise from North), see above
GST Peak 8-sec. gust speed (m/s), RE:
Beaufort Scale
Time * Note: In the NOAA
Historical Data, Time (day, DD, and hour, hh) is provided in UTC or
Universial Time. To obtain Eastern Daylight-Saving Time,
which is when the GCBS is held, 4 hours are substracted from the UTC. The Time shown
above is the corrected (actual) time at the bay bridges. The TPLH
measurements shown occurred when most swimmers were in the middle of the
event. |
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