Thunderstorm Risk 15th April 2009
- 1. Thunderstorm Risk for the Coming Week... (15 th April 2009) Using the GFS 12Z on 13 th April 2009 Thunderstorm Risk Key Very Low- 10%-20% Chance Low- 20%-30% Chance Low-Moderate- 30-40% Chance Moderate- 40-50% Chance Moderate- 50-60% Chance Moderate-High- 60-70% High- 70-80% Chance High-Very High- 80-90% Chance Very High- 90-100% Chance 50-60% 40-50% 30-40% 20-30% 10-20%