Looking ahead toward the late week into weekend period, additional
perturbations in the flow keep low-end probabilities (15 to 25
percent) for precipitation in the forecast. As temperatures cool
through the week, some of this would be comprised of a rain/snow
mix. The overall surface pattern does show high pressure building in
from the Great Lakes while a wavy frontal zone arcs along the
southern U.S. Uncertainty is unusually high toward the end of the
period given the complexities of the flow to resolve. Deterministic
models continue to vary wildly from run to run, but this is not
surprising at this point. It does remain a period to monitor
ahead.