NATIONAL FORECAST Low pressure will move northeast over the northern Great Lakes Thursday. Chicken Little would love this one. The Earth is hurtling into the path of a comet called Temple-Tuttle. The scientists who track Temple-Tuttle do not even call it a shower, they call it a meteor storm. For the United States, therefore, the entire show will be during daylight hours and will be invisible, unless unusually bright bolides, or exploding fireballs, flash through the sky.