Invest 99L, while having a defined low-level center, continues to be a non-tropical low. There are showers and thunderstorms rotating around the area of low pressure, but mostly a distance away from the actual center.
A strong upper-level trough and surface cold front moving through the Eastern States is beginning to pick up Invest 99L. It will continue to accelerate to the north-northeast through Saturday moving east to the U.S. and west of Bermuda Friday night. Invest 99L will combine with the cold front to bring heavy rain to Atlantic Canada Saturday as it moves inland.
Rough surf will continue to affect the Bahamas and the eastern U.S. Friday night into Saturday. Showers and thunderstorms are also likely to occur over Bermuda Friday night.
Elsewhere, development is not expected in the Atlantic Basin.
By AccuWeather Senior Meteorologist Ken Clark
099 ABNT20 KNHC 211736 TWOAT TROPICAL WEATHER OUTLOOK NWS NATIONAL HURRICANE CENTER MIAMI FL 200 PM EDT FRI OCT 21 2016 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: A non-tropical area of low pressure located about 400 miles south-southeast of Cape Hatteras, North Carolina, is expected to move toward the north-northeast with increasing forward speed later today. Increasing upper-level winds are expected to limit the opportunity for this system to become a subtropical or tropical cyclone, and this low is expected to degenerate into a trough ahead of an approaching frontal system tonight or early Saturday. * Formation chance through 48 hours...low...30 percent * Formation chance through 5 days...low...30 percent $$ Forecaster Avila