Thunderstorm Risk for the Coming Week... (15th April 2009)Using the GFS 12Z on 13th April 2009

Thunderstorm Risk KeyVery 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%