Which weather hazard is most likely when the forecasted K index is K35?

Which weather hazard is most likely when the forecasted K index is K35?

• A. 30% chance of thunderstorms
• B. 60% chance of thunderstorms
• C. 60% chance of light rain
• D. No risk of weather

Answer: (B)

The K index measures thunderstorm potential from the atmospheric profile; higher values mean more instability and a greater chance of thunderstorm activity. A forecasted K index in the mid-range (around 3 to 5) corresponds to a substantial thunderstorm risk, typically about a 60% probability. So with a K index like K35, the weather hazard most likely is thunderstorms with roughly a 60% chance. The other scenarios don’t fit that level of instability: a 30% chance of thunderstorms would imply a lower index, light rain alone isn’t as likely as thunderstorms at this index, and no weather risk contradicts the mid-range instability indicated by the K index.

The K index measures thunderstorm potential from the atmospheric profile; higher values mean more instability and a greater chance of thunderstorm activity. A forecasted K index in the mid-range (around 3 to 5) corresponds to a substantial thunderstorm risk, typically about a 60% probability. So with a K index like K35, the weather hazard most likely is thunderstorms with roughly a 60% chance.

The other scenarios don’t fit that level of instability: a 30% chance of thunderstorms would imply a lower index, light rain alone isn’t as likely as thunderstorms at this index, and no weather risk contradicts the mid-range instability indicated by the K index.