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In the United States during flood events , the National Weather Service will issue flood warnings that list the current and predicted stages for affected communities as well as the local flood stage .
 United States, National Weather Service
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United States, National Weather Service