"We can estimate the biomass of the bloom, but we do not have the ability yet to forecast the toxicity," Stumpf said.
How far the bloom spreads out of the western basin will depend on the winds, he said.
Much of the lake will be fine most of the time." The algal blooms seldom spread as far east as Cleveland, he said.
This summer, for the first time, NOAA will track the algal blooms with a new weather satellite, Sentinel-3, that will beam back to Earth a more accurate picture, providing the power to detect blooms one-tenth the size of blooms previously detected, Stumpf said.
All are on the chopping block among the Trump Administration's proposals, but should be fully funded, according to the senators.