Within the keyword term, the phrase "September 11th" functions as an adjectival modifier. It serves as a noun adjunct that specifies the head noun, which is "weather." The entire three-word term operates as a single, cohesive noun phrase, with "weather" as its core subject.
A noun adjunct is a noun, or in this instance a noun phrase representing a specific date, that modifies another noun, fulfilling the descriptive role of an adjective. For example, in the term "brick house," "brick" modifies "house." In the same way, "September 11th" modifies "weather" by specifying its temporal context. This grammatical construction isolates a particular instance of the noun for analysis, defined entirely by the date provided, distinguishing it from weather on any other day.
Understanding this grammatical role is crucial as it establishes "weather" as the primary subject of the article, not the events of the date itself. The structure dictates that the focus should be on the meteorological conditionssuch as visibility, temperature, wind, and atmospheric pressureobserved on that specific morning. The date serves as a frame of reference, ensuring the article is a specific atmospheric analysis rather than a historical narrative.
