Post Tropical Cyclone Dolly — AtlasCast Calibrated Model

Calibrated model mean track
🌀 Dolly, PTC, 35kt/40mph (NHC adv #005, 1500 UTC Aug 28)

Live storm vitals

Position15.0N, 46.9W
Max sustained wind35kt / 40mph
Central pressure1008 mb
MovementWNW at 25mph
Sea surface temp82.0F

NHC outlook

Weakened to post tropical as forecast. Winds expected to fall below tropical storm strength by Saturday. Main real threat now is heavy rain and flash flooding for the Leewards, Puerto Rico, and Hispaniola, not wind.

Our predicted positions

+48h13.9N, 70.8W
+96h20.4N, 95.3W

Caveat: NHC stopped issuing tracked advisories once Dolly became an open wave. Real regeneration odds are described as low with no consensus location. Both our model and real official assessments agree this is not shaping up as a serious US threat, our 96h point lands near the Mexico coast, not Texas.

Backtested accuracy (90 storms)

Our calibrated model504km @48h / 1216km @96h
Raw steering advection877km @48h / 1698km @96h
NHC CLIPER5 baseline~418km @48h
NHC official forecast~117km @48h

Persistence + climatology + steering regression, cross validated on 90 real Atlantic storms (2018 to 2023). Built and run on our own GPU.