In a mixed blessing, so much Bertha rain is occurring over Puerto Rico that Flash Flood Warnings are already going up.
THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A
* FLASH FLOOD WARNING FOR... THE FOLLOWING MUNICIPALITIES
IN PUERTO RICO CANOVANAS CEIBA NAGUABO FAJARDO LUQUILLO RIO GRANDE
* UNTIL 1245 PM AST
As of 10 AM EDT, Bertha may or may not be devolving into a wet and windy open wave. A careful analysis of cloud, precip, ocean wave and wind data does suggest this as a strong possibility. It is also noteworthy that the strongest thunderstorms have been located about 100 miles to the SSE of Ponce, P.R., and within this cluster a mid-level rotation may be attempting to work its way to the surface, which might help reposition Bertha somewhat south and a little east of her extrapolated coordinates.
If either situation, or both, verifies (open wave/center relocation to the south), Bertha could end up tracking further west than presently forecast.