Yes, dry mustard can safely be used as a substitute for mustard seed. However, it may make the brine cloudier than mustard seed and may alter the flavor.   1 teaspoon mustard seeds = 1Â½ teaspoons dry mustard.
Humeston is a city in Wayne County, Iowa, United States. The population was 494 in the 2010 census, a decline from 542 in the 2000 census.
Humeston-area historical tornado activity is slightly below Iowa state average. It is 66% greater than the overall U.S. average. On 5/10/1953, a category F4 (max. wind speeds 207-260 mph) tornado 8.7 miles away from the Humeston city center caused between $5000 and $50,000 in damages.