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Home > Weather and Earthquakes > Tropical Cyclone Information

50-kt Wind Probability:

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Prefecture
50-kt wind probability indicates the chance of tropical cyclone-related sustained winds with speeds exceeding 50 knots during the specified forecast period in any of prefectural sub-divisions.
50-kt wind probability data are issued for sub-divisions where the probability is expected to exceed 0.5 percent within 72 hours. They are issued at around 01, 07, 13 and 19 UTC based on tropical cyclone analysis and forecasting carried out at 00, 06, 12 and 18 UTC.
A period with rapidly increasing (decreasing) probability indicates a higher (lower) likelihood of tropical cyclone-related sustained winds with speeds exceeding 50 knots during the specified forecast period. The likelihood peaks with higher values in probability data.