Some times it's just not in the cards. You've been looking forward to the big airshow for weeks and now that it's here, the weatherman has given you the news you didn't want to hear. Rain.
Rain can be a case of you making lemonade out of lemons. The weather is only a prediction and that can change. Planes can perform in the rain as long as the cloud ceiling is high enough and visibility far enough. The high humidity that accompanies rain means lots of vapors streaming from the planes that are flying. With the sun's bright light obscured, afterburner flames are clearly visible. If the clouds do begin to open, the resulting sun light can be stunning. True, you won't have that ice blue sky you dreamed of but, bad weather can produce some of the most dramatic photographs in your portfolio.
What happens if no one can fly? Work on your static shots. This is a great oppurtunity to get really creative with photographing objects on the ground. Besides during that sunny airshow you've always wished there were fewer people wondering through your shot. Well, a lot of folks stay home if they think it will rain. Now is your chance to have that plane all to yourself.
I pack a pancho if there is a chance of rain. I find they work very well. They are light and take up little space when folded up. I can put it on quickly and it covers all of the gear I have on my body. And I can still get to my gear quickly. If I need to pull the camera out to get a shot I simply pull it out through the side.
So, don't let your next airshow be a complete washout because there is rain in the forcast.
More images can be found here.