Weather Quiz

The wind is reported as a five-digit group (six digits if speed is over 99 knots). The first three digits is the direction the wind is blowing from rounded to the nearest tens of degrees relative to true (not magnetic) north, or "VRB" if the direction is variable. The next two digits is the speed in knots, or if over 99 knots, the next three digits. If the wind is gusty, it is reported as a "G" after the speed followed by the highest gust reported. The abbreviation "KT" is appended to denote the use of knots for wind speed. The wind group for KJFK is 18004KT which means the wind is from 180 degrees at 4 knots.

A squall line is a non-frontal, narrow band of active thunderstorms. The line may be too long to easily detour and too wide and severe to penetrate. It often contains severe steady-state thunderstorms and presents the single, most intense weather hazard to aircraft.

Any convective SIGMET implies severe or greater turbulence, severe icing, and low-level wind shear. The forecast may be issued for any of the following; severe thunderstorms due to: 1. Surface winds greater than or equal to 50 knots, or 2. Hail at the surface greater than or equal to 3/4 inch in diameter, or 3. Tornadoes, embedded thunderstorms, lines of thunderstorms.

A squall line is a nonfrontal, narrow band of active thunderstorms. The line may be too long to easily detour and too wide and severe to penetrate. It often contains severe steady-state thunderstorms and presents the single, most intense weather hazard to aircraft.

Conditions favorable for radiation fog are clear sky, little or no wind, and small temperature/dew point spread (high relative humidity). Radiation fog is restricted to land because water surfaces cool little from nighttime radiation.Answer (B) is incorrect because radiation fog will not form over water since water surfaces cool little from nighttime radiation. Answer (C) is incorrect because radiation fog will not form over water since water surfaces cool little from nighttime radiation.