OBS Weather & Hazardous Conditions 3 — Questions and Answers
Question 1: What does a red sky in the morning typically warn mariners about?
- Clear, calm day ahead
- Deteriorating weather approaching (Correct answer)
- Strong winds subsiding
- Fog expected by afternoon
Correct answer: Deteriorating weather approaching
The mariners' adage 'red sky in morning, sailor take warning' reflects that red morning skies often indicate moisture-laden air and approaching storm systems.
Question 2: What hazard do strainers create for paddlers and small boat operators?
- They block radar signals
- They trap boats and people against objects while water flows through (Correct answer)
- They cause unexpected depth changes
- They generate whirlpools that spin vessels
Correct answer: They trap boats and people against objects while water flows through
Strainers are obstacles like fallen trees that allow water to pass through but trap boats and people, creating a life-threatening pinning force.
Question 3: When operating in coastal waters, a gale warning is issued for sustained winds of:
- 15–20 knots
- 21–33 knots
- 34–47 knots (Correct answer)
- 48–63 knots
Correct answer: 34–47 knots
Gale warnings are issued when sustained winds of 34–47 knots (approximately 39–54 mph) are expected, posing serious danger to small craft.
Question 4: Which VHF channel should boaters monitor for continuous NOAA weather broadcasts?
- Channel 16
- Channel 9
- Channel WX1 (162.550 MHz) (Correct answer)
- Channel 22A
Correct answer: Channel WX1 (162.550 MHz)
NOAA Weather Radio broadcasts on weather channels (WX1–WX7), with WX1 at 162.550 MHz being the most widely used for continuous weather information.
Question 5: What is a 'waterspout' and why is it dangerous to boaters?
- A large breaking wave caused by shoals
- A rotating column of water-filled air similar to a tornado over water (Correct answer)
- An upwelling current that causes whirlpools
- A high-pressure system that creates strong offshore winds
Correct answer: A rotating column of water-filled air similar to a tornado over water
A waterspout is a rotating funnel of air and water that can capsize small vessels, generate strong winds, and produce dangerous seas.
Question 6: How should a boater navigate when encountering large ship wakes in open water?
- Take the wake beam-on to reduce pitching
- Head directly into the wake at reduced speed (Correct answer)
- Turn away from the wake and run parallel
- Speed up to jump over the wake
Correct answer: Head directly into the wake at reduced speed
Heading bow-first into large wakes at a safe, controlled speed prevents the vessel from rolling dangerously beam-to-wave.
Question 7: What weather phenomenon causes lake and coastal water levels to rise dangerously on the downwind shore during storms?
- Tidal surge
- Storm surge
- Wind setup (seiche) (Correct answer)
- Hydraulic gradient
Correct answer: Wind setup (seiche)
Wind setup (seiche) occurs when strong sustained winds push surface water toward the downwind shore, causing significant water level rises that can flood docks and marinas.
OBS Weather & Hazardous Conditions 3
What does a red sky in the morning typically warn mariners about?