How can you seek shelter during a storm if you are in a field with no hole?

Depending on the type of storm, there are different things you should do.

If you are in the path of a fast moving tornado, you should try to get out of its way and find the deepest depression in your area to lay down in. Lying down will reduce your chance of being in the path of high velocity debris. Hopefully you are far enough away from the tip of the tornado that you are not lifted up into the air and uncontrollably carried away.

If it's a lightning storm that you find yourself in the center of, just lay down wherever you are. Higher points in the area of a strike have a better chance of completing the circuit for a bolt of lightning. This does not mean the lowest location will not be the strike point, it just means the lowest point has less of a chance of becoming the strike location.

If it's just a rain storm, go find some place to get inside out of the storm. If there are high winds associated with this storm, lay down during high wind burst to avoid being struck by flying debris.