sedge: grasslike or rushlike plant growing in wet places having solid stems, narrow grasslike leaves and spikelets of inconspicuous flowers
marsh plant: a semiaquatic plant that grows in soft wet land; most are monocots: sedge, sphagnum, grasses, cattails, etc; possibly heath
national weather service: the federal agency in the National Oceanic and Atmospheric Administration that is responsible for weather forecast and preparation of weather maps