Well letting them hatch in the tank is never a good idea, if the water conditions aren't right, they won't even hatch, plus the eggs tend to dislodge and will float on the water surface.
However, if it's warm and wet out, get a bucket.. I use the 1 gallon icecream buckets from the grocery store, but a 5 gallon works great, too, put water in it from your last water change, a few IAL or oak leaves, driftwood, live plants.. just whatever you can find to make the water dark and provide organic cover. I add coppersafe to the water before letting anything grow in it. You'll want to leave this bucket in the sun for a day or two, to get the algae growing and then set it in a shady place and wait.
In my area, the smokey mountains, there are no problems with West Nile, but if there has been any outbreaks in your area over the last year, skip it. Otherwise, go right ahead. Though I would cover the bucket with a wire mesh of some kind, to keep other animals from contaminating your water.