PM Update: Scattered showers and thunderstorms through the early evening. Much cooler on Monday. You may have to dodge some raindrops through about 8 tonight. A cold front moves through tomorrow morning and ushers in much more seasonable weather.
Only cook live crabs, because they deteriorate very quickly after they have expired. You can simply throw the crabs in a pot of boiling water to cook them. Depending on the size of the crabs, it will take between 6 and 10 minutes for them to cook thoroughly. If the crab is alive when you start, the amount of cooking time has very little to do with safety  it s more a question of whether the meat is underdone, overdone, or cooked just right.
Crabs are cooked by boiling in salted water. Crabs are generally either placed live into the boiling pot or killed just prior to cooking. Do not use crabs that have been dead for more than a couple of hours without being cooked. Use 1/4 cup salt per quart of water. Bring the water to a boil. Introduce the crabs and return to a boil. Boil for about 20 minutes.