Fresno, California – Central California faces a rare December thunderstorm setup Friday, with storms capable of producing locally heavy rainfall and an increased threat of flooding, according to forecasters.
The National Weather Service in Hanford reports that much of the Central Valley, including the Fresno area, is under a general thunderstorm risk today. While the severe weather threat remains low, forecasters note a less than 5 percent chance of damaging winds and a less than 2 percent probability of a tornado — probabilities that are considered very unusual for Central California.
Thunderstorms that develop may produce brief but intense downpours, which could overwhelm drainage systems and lead to localized flooding, particularly in urban areas, low-lying locations, and near small creeks. Recent rainfall and saturated ground conditions could increase runoff efficiency during heavier showers.
The Weather Service emphasizes that while widespread severe weather is not expected, any thunderstorm could quickly become impactful due to rainfall intensity. Small hail and gusty winds are also possible within stronger storm cells.
The tornado risk, while minimal, highlights the dynamic nature of the storm system moving through the region. Forecasters stress that even low-probability events warrant attention, especially in areas unaccustomed to severe weather.
Residents are encouraged to remain weather-aware throughout the day, especially if traveling or commuting during heavier showers. Motorists should avoid driving through flooded roadways and be alert for rapidly changing weather conditions.
Storm activity is expected to diminish later Friday as the system moves east, reducing the risk of additional thunderstorms. The National Weather Service advises checking updated forecasts and alerts at weather.gov/hanford as conditions evolve.
