When a weather forecast mentions “scattered thunderstorms,” it indicates a specific atmospheric condition where thunderstorms are expected to develop across a given area. This term suggests storms will develop across an area but not uniformly, meaning some locations may experience a storm while others nearby remain dry.
Understanding “Scattered” in Weather Forecasts
The term “scattered” in weather forecasts refers to the coverage of thunderstorms within a designated area, typically implying that 30% to 50% of the forecast region will be affected. This percentage distinguishes it from “isolated” thunderstorms, which cover a smaller area, usually around 10% to 29%, and “widespread” or “numerous” thunderstorms, which impact more than 60% of the area. When scattered storms are predicted, individual storm cells develop with significant gaps of clear skies between them, meaning not every location within the forecast zone will experience a thunderstorm. The terms “isolated” and “scattered” describe the spatial distribution of storms and do not inherently indicate their intensity or duration.
Typical Characteristics of Scattered Thunderstorms
Scattered thunderstorms often bring heavy but localized rainfall, lightning, and thunder. Rain can be intense and sporadic as storm cells move through. Lightning is frequent, and if thunder is heard, lightning is close enough to pose a threat. These storms can also produce strong, damaging winds and sometimes hail. While typically not as severe as larger, organized storm systems, individual scattered thunderstorms can still generate damaging straight-line winds and hail, posing risks to outdoor activities and property.
What to Do When Scattered Thunderstorms Are Forecast
When scattered thunderstorms are in the forecast, remaining aware of local conditions is advisable. Monitoring real-time weather radar can help determine the specific movement and location of individual storm cells. If thunder is heard, it is a clear indication to seek shelter immediately, as lightning is then close enough to strike.
Sturdy buildings offer the best protection, but a hard-topped vehicle with windows closed also provides a safer alternative than being outdoors. It is prudent to postpone outdoor activities such as swimming, boating, or golf if thunderstorms are anticipated.
During a storm, avoiding contact with electrical appliances, corded phones, and plumbing is important, as lightning can travel through these pathways. Having a severe weather plan in place, including knowing where to take shelter and how to receive updated weather information, enhances safety for everyone in the area.