Weather Observation Flashcards
7 cards from real S-130 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Weather Observation flashcards as text
What is the term for the layer of air closest to the earth's surface where most weather occurs?
Answer: Troposphere
The troposphere is the lowest atmospheric layer and the zone where virtually all weather phenomena, including fire weather, occur.
Which instrument measures atmospheric pressure and is used to help forecast approaching weather systems?
Answer: Barometer
A barometer measures atmospheric pressure; falling pressure often indicates an approaching storm or weather change relevant to fire behavior.
A firefighter observes cumulus clouds building rapidly into towering cumulonimbus clouds overhead. This indicates:
Answer: Possible thunderstorm activity and erratic winds
Rapid vertical development into cumulonimbus signals convective instability and potential for thunderstorm-generated erratic outflow winds and dry lightning.
What does a lapse rate describe in fire weather meteorology?
Answer: The rate at which temperature decreases with increasing altitude
Lapse rate is the rate of temperature decrease with altitude; a steep lapse rate indicates atmospheric instability that promotes fire development.
Which type of wind is caused by the local heating of slopes during the day, causing air to flow uphill?
Answer: Anabatic wind
Anabatic winds are upslope winds driven by daytime solar heating of mountain slopes, which can carry fire uphill rapidly.
During a spot weather forecast request, which information about your fire location is MOST critical to provide to the meteorologist?
Answer: Elevation, aspect, and slope steepness
Elevation, aspect, and slope steepness determine local wind patterns, temperature, and humidity, allowing meteorologists to tailor the forecast accurately.
What is the primary danger posed by a temperature inversion in relation to wildland fire?
Answer: It traps smoke near the ground reducing visibility and may suddenly break releasing unstable air
A temperature inversion can trap smoke and suppress fire activity temporarily, but when it breaks it releases unstable air that can cause rapid fire acceleration.