field# |
field_name |
description |
Coded |
note |
1 | jday | Julian calendar day | Calendar begins 1200 Jan 01, 4713 BC | |
2 | lat | Latitude in decimal degrees | North positive and south negative | |
3 | lon | Longitude in decimal degrees | East positive, west negative | |
4 | year | Year | 18xx-19xx | |
5 | month | Month of the year | ||
6 | day | Day of the month | ||
7 | hour | Hour GMT | 0000 GMT - 2300 GMT | |
8 | wd_ind | Wind direction indicator | coded | always NULL in ambrose file NULL= 36pt compass |
9 | w_dir | Direction from which the wind is blowing | coded | 00-36, 99=variable |
10 | wsp_ind | Wind speed indicator | coded | NULL = not measured, 0 = measured |
11 | w_sp | Wind speed in knots | 001-199 = 1 to 199 knots, 000 - Calm | |
12 | vis_ind | Visibility indicator | coded | NULL = not measured, 0 = measured, 1 = fog present |
13 | vis | Horizontal surface visibility in kilometers 90-99 | coded | If vis_ind=1 and vis=93, Fog present but vis not rptd |
14 | pr_wthr | Present weather - qualitative | coded | 00-99 |
15 | pa_wthr | Past weather- qualitative | coded | 0-9 |
16 | sl_press | Sea level pressure in millibars | 890.0-1070.0 millibars | |
17 | t_ind | Teperatures indicator 1, 3 or 5 | coded | Indicates measured in tenths, whole or half degrees C |
18 | t_air | Air temperature | negative numbers originally overpunched | |
19 | t_wb | Wet bulb temperature | negative numbers originally overpunched | |
20 | t_dp | Dew point temperature | negative numbers originally overpunched | |
21 | t_ss | Sea surface temperature | negative numbers originally overpunched | |
22 | t_asea | Air-sea temperature difference | negative numbers originally overpunched | |
23 | cl_tot | Total cloud amount | coded | Fraction of celestial dome cloud covered 0-9 |
24 | wav_dir | Direction from which waves come | coded | |
25 | wav_p | Period of waves | coded | |
26 | wav_ht | Height of waves in half m increments | ||
27 | sw_dir | Direction from which swell comes | coded | same code as wave direction |
28 | sw_p | Period of swell | coded | same code as wave period < 1968, then code changes |
29 | sw_ht | Height of waves in half m increments | ||
30 | add_di | Additional data indicator | coded | |
31 | bar_tdcy | Barometric Tendency | coded | qualitative 3hr press change |
32 | press_chg | Amt. press. change from 3 hr earlier 0-29.9 millibars | ||
33 | rel_hmd | Relative humidity 0-100 | last 5 fields supplemental - mostly NULL | |
34 | iowb_ind | Ice on wet bulb indicator | last 5 fields supplemental - mostly NULL | |
35 | t_oind | Original temperature indicator | coded | last 5 fields supplemental - mostly NULL |
36 | t_sind | Sea temperature method indicator | last 5 fields supplemental - mostly NULL | |
37 | wav_p | Wave period in seconds 99=confused sea | last 5 fields supplemental - mostly NULL | |
38 | low_cl_amt | Total cloud amount | coded | Fraction of celestial dome cloud covered 0-9 |
39 | low_cl_type | Low cloud type 0-9,- | coded | |
40 | cl_ht | Height range above sea surf.lowest cloud | coded | 0-9 |
41 | mcl_type | Middle cloud type 0-9,- | coded | |
42 | hcl_type | High cloud type 0-9,- | coded |
Return to Ambrose Channel lightship
Last Updated on 11/18/98
By Kathryn L. Elder