Marine Thunderstorm Wind — Altamaha Sd To Fernandina Beach Fl Out 20nm, Atlantic South

2023-05-17 · near Mckinnon Arpt, Altamaha Sd To Fernandina Beach Fl Out 20nm, Atlantic South

Event narrative

The ASOS at the Malcom McKinnon Airport on St. Simons Island measured a wind gust of 48 mph.

Wider weather episode

An upper-level trough was across the eastern US with unsettled SW steering flow over the local forecast area. An old outflow boundary from prior convection moved across NE FL through the afternoon, which combined with sea breeze forcing and diurnal instability triggered a few strong to severe storms. Stronger dynamics (effective shear of 20-25 kts) and seasonably cool 500 mb temps (-10 degC) were across SE GA, but drier low-level air limited low-level instability and only enabled a few strong to isolated severe storms to develop in the late afternoon and into the evening near boundary merger.

View location on OpenStreetMap → (31.1500, -81.3800)

Source: NOAA Storm Events Database, event_id 1098167. Narrative written by the NWS forecast office that issued the report.