Grain can be traded in the futures market before harvesting. If grain production is predicted to be insufficient, grain futures prices will rise; if grain harvests are predicted, grain futures prices will fall. This morning, meteorologists predicted that from tomorrow there will be much-needed rainfall in the grain-producing areas. Therefore, since sufficient moisture is very important to the survival of current grains, the price of grain futures today will fall sharply.
If true, the statement "Tomorrow's rainfall predicted by meteorologists is likely to extend beyond the grain-producing areas" weakens the above point of view most seriously.