What information would be included in the remarks section of a METAR during a hail storm with hailstones sizes from 1/4 inch to 1 inch?

The remarks section of a METAR report provides additional information that can be critical for interpreting the current weather conditions. During a hailstorm, it's important to accurately denote the presence of hail in the remarks.

The correct choice includes "GR," which is the code used to indicate hail in a METAR report. The number following "GR" represents the size of the hailstones observed, measured in inches. In this case, "GR 1" indicates that hail with a size of 1 inch is present. Given that hailstones range in size from 1/4 inch to 1 inch, reporting the maximum size of 1 inch is particularly relevant and useful for pilots and meteorologists.

Other choices reference different weather phenomena. For example, "RA" indicates rain, "SN" indicates snow, and "FG" indicates fog. None of these options correctly communicates the occurrence of hail, which is the crucial information needed during the specified conditions. Thus, the inclusion of "GR 1" succinctly and accurately reflects the presence of significant hail, making it the appropriate choice.