A sudden thunderstorm brought hail and heavy rain to Inawashiro town in Fukushima Prefecture on Wednesday [1].
The event highlights the volatility of spring weather in southern Kanto, where unseasonably high summer temperatures are creating atmospheric instability [1], [2]. This instability can lead to rapid weather shifts that threaten local infrastructure and tourism.
Witnesses reported that the hail lasted for approximately 10 minutes [1]. According to a videographer on the scene, the storm began with nearby lightning and heavy rain before the hail started falling and steadily increased in size [1].
"I was surprised because it has not hailed in Inawashiro before," the videographer said [1].
The sudden nature of the storm caught both local residents and foreign tourists by surprise. Some individuals expressed concern over potential property damage as the ice pellets grew.
"Because the hail was quite large, I was worried about whether the car would be scratched," the videographer said [1].
When asked if such an event is rare for the region, the videographer said it is [1]. Similar reports of hail emerged from surrounding areas, and thunderstorms were later reported in Kyoto and Hyogo [1].
Meteorological data indicates that the current trend of summer-like heat during May is a primary driver for these thunderstorms [2]. The combination of heat and moisture creates the ideal conditions for the vertical cloud growth required to produce hail.
“"I was surprised because it has not hailed in Inawashiro before,"”
The occurrence of hail in Inawashiro, an event described by locals as rare, suggests a shift in regional weather patterns. When unseasonably high temperatures collide with unstable air masses, it increases the frequency of severe convective storms. This puts pressure on local disaster preparedness and can disrupt the tourism industry during the peak spring travel season.
