384 UNDERWATER WEATHER STATION 



12th Day 



Lower weather station out of order in a.m. Upper weather station appears o.k. Installed 

 thermistors— upper temperature 53°F (11.5°C), lower temperature 51°F (10.05°C). 



Sensors 1 and 2 indicate 0.5 knot offshore current; observations from Sealab port indicate 

 24 in. in 25 sec offshore. Decreased to "0" current by 1200. Plankton sinking down steadily. 

 1700— observed very slight offshore and down current. 1800— same observation, 24 in. in 30 

 sec. Temperature at 1600 was 55°F (12.2°C) with thermometer hand held outside. Thermistor 

 records 51°F (10.05°C) on line 36 of Rustrak recorder. 



13th Day 



Temperature 50-51 °F (thermistor o.k. with hand-held calibration). Visibility poor due to 

 plankton. Current— 0.2 to 0.6 knot on sensor 5. Direction vane shows offshore flow most of 

 day. Current observations from Sealab port: 



0800 offshore and down 



1030 offshore and down 24 in. in 40 sec 



1100 offshore and down 24 in. in 60 sec 



1200 sinking down very slowly 



1600 current changed to up 24 in. in 30 sec 



14th Day 



Visibility poor in early a.m. Current upwelling— up and offshore 6 in. in 20 sec. 1100— 

 sensor 5 indicated 0.35 knot steady. Sensor 2 (upper) off scale on high side. Current direction 

 southwest to south southwest. 1145— Sensor 5 reads 0.3 knot, sensor 2 reads off scale on high 

 side. Current direction southwest. Flying fish came in with upwelling? Sediment covers rotors 

 in three-day period. Mica and light material deposit on flat surfaces. Thirty-five pound anchor 

 covered by sediment. One-quarter in. sediment fill on underwater weather station platform in 

 three days. Sensor 5 is dirty; sensor 2 is clean and runs faster than 5 on all observations. 



15th Day 



Visibility very poor, no light. Many fish at the ports. Current is offshore and up, no surge. 

 Very slight current. Good weather topside for transfer of personnel. 



Diver observations and their comparison with the underwater weather station recordings 

 show a fluctuating irregular current pattern during periods of high waves. This is followed by 

 a somewhat more uniform flow during periods of low waves. 



