3:15 PM | *Watch for isolated areas of black ice later tonight as temperatures drop through the 20’s*
The rain is already beginning to wind down in the DC metro region and will do so over the next few hours in Philly and NYC, but our troubles may not be completely over at that point in time. Temperatures will drop quite a bit in the overnight hours and any standing water that remains on untreated surfaces will freeze later tonight with low-to-mid 20’s likely by the early morning hours. The prospect of isolated areas of black ice late tonight could even result in more of the now widely utilized "2-hour school delay" for Thursday.
Winds will also pick up in intensity as the evening wears on potentially gusting past 30 mph before the midnight hour. This is actually a good thing as these NW winds are likely to help “dry out” many surfaces, but isolated slick spots are still likely to form later tonight following the widespread heavy rainfall of this afternoon. High pressure will build into the region late tonight and Thursday and it’ll turn out dry, breezy and cold tomorrow – not a bad day at all for a parade in Philly.
Meteorologist Paul Dorian