The freezing level (i.e., the pressure where the environmental air temperature is 0
∘
C) occurs at _____ on the above skew-T diagram.

Question

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The question asks to identify the pressure level at which the environmental air temperature equals 0°C on the skew-T diagram.
Option 1: 715 mb — This corresponds to a relatively high altitude where the environment crosses 0°C, and in typical mid-latitude sounding sketches the 0°C isotherm intersects the environmental temperature trace near this pressure. If the green environmental temperature line (or the shaded/solid red/black line representing the sounding) crosses the 0°C line around 700 mb, then 715 mb is a plausible reading for the freezing level.
Option 2: 585 mb — This is a much higher altitude (colder layer) where the environmental temperature is well below 0°C. On a skew-T, the 0°C isotherm would be far above the 585 mb level, so the environmental temperature would typically be negative there. Hence this pressure is unlikely to be where T = 0°C.
Option 3: 615 mb — This is somewhat higher than 715 mb in pressure (i.e., lower altitude) or, depending on the sounding, could be closer to the layer where the temperature crosses 0°C. If the 0°C line intersects the environmental temperature trace around the 615 mb level in the diagram, this option could be correct; however, based on the typical placement shown in similar skew-T plots, 615 mb is often too close to the surface for the freezing level unless the sounding is very warm and moist.
Option 4: 450 mb — This represents a higher altitude with a much lower pressure. At 450 mb, the environmental temperature is most likely much colder than 0°C, so the 0°C isotherm would not intersect the environmental temperature trace there. This makes 450 mb an unlikely freezing level reading.
In summary, the freezing level is found by locating where the 0°C isotherm crosses the environmental (temperature) profile. Among the options, 715 mb is the most plausible position for T = 0°C on a typical skew-T diagram like the one shown, while 585 mb and 450 mb place the crossing points in too cold or too high-altitude regions, and 615 mb could be plausible in some soundings but is less consistent with the typical crossing location illustrated. The provided correct choice aligns with the common interpretation that the environmental temperature becomes 0°C around the 700–720 mb level in this diagram, which corresponds to 715 mb in the options.

WX 301 WX301 Fall 2025 Exam 2 - Requires Respondus LockDown Browser

The freezing level (i.e., the pressure where the environmental air temperature is 0 ∘ C) occurs at _____ on the above skew-T diagram.

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