METEOROLOGY – EVERE WEATHER & TORM CALCULATOR
K Index
A precise tool.
What is the K Index & How does it work?
The K-index is a measure used in meteorology to predict the potential for severe thunderstorms, particularly those that could produce tornadoes. It is calculated using temperature and dew point data from two different levels of the atmosphere: 850 hPa (about 1500 meters above sea level) and 700 hPa (about 3000 meters above sea level).
A K-index value of 40 or higher suggests a high risk of severe thunderstorms, while values between 35 and 40 indicate an increased likelihood. Values below 35 suggest a lower probability of severe weather.
K = T_{850} – T_{d,850} + frac{T_{700} – T_{d,700}}{2}
T = Temperature in Celsius
Td = Dew point temperature in Celsius
Td = Dew point temperature in Celsius
Parameters
Result
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Frequently Asked Questions
What is the K-index used for in meteorology?
The K-index predicts the potential for severe thunderstorms, particularly those that could produce tornadoes.
How is the K-index calculated?
K = T_{850} – T_{d,850} + frac{T_{700} – T_{d,700}}{2}, where T is temperature and T_d is dew point temperature in Celsius at 850 hPa and 700 hPa levels.
What do the values of 850 hPa and 700 hPa represent?
850 hPa is about 1500 meters above sea level, and 700 hPa is about 3000 meters above sea level.
What does a K-index value of 40 or higher indicate?
A K-index value of 40 or higher suggests a high potential for severe thunderstorms, particularly those that could produce tornadoes.
Can the K-index predict all types of weather events?
The K-index is specifically used to predict the potential for severe thunderstorms and tornadoes.
Where can I find temperature and dew point data for calculating the K-index?
Temperature and dew point data for 850 hPa and 700 hPa levels can typically be found in meteorological reports or online weather databases.
How often should I calculate the K-index to monitor severe thunderstorm potential?
It is recommended to calculate the K-index regularly, especially during periods when severe weather conditions are expected.
Results are for informational purposes only and do not constitute professional advice.