Strong wording for CTP
e post-tropical transition of Ida (interaction with the mid- latitude westerlies and quasi-stationary front draped near the MD/PA line) will bring extreme rainfall and considerable flooding impacts to south central PA today into early Thursday. Strong signals in the latest hires ensemble guidance leads to high confidence extreme 24-hr rainfall totals of 4 to 6+ inches with local amounts up to 8 inches possible. The 01/00Z HREF probability of 24hr QPF to exceed 100yr ARI is 70-100% which increases confidence in extreme rainfall even more. To put this into a more localized climatological perspective, we are forecasting a top-5 maximum daily rainfall total at Harrisburg.