From the National Weather Service:
The latest briefing on the multi-hazard weather impacts for the Florida Keys is attached. This briefing will also post to https://www.weather.gov/media/key/DSS/dssbrief_land.pdf.
A non-tropical low pressure system over the central Gulf of Mexico this morning is expected to bring a variety of weather impacts in the Florida Keys and its adjacent coastal waters through at least early Sunday.
- A Slight Risk (Level 2 out of 5) for severe, damaging wind gusts near 60 mph in thundery squalls and isolated tornadoes or this afternoon through tonight. A Marginal Risk (Level 1 out of 5) is outlooked for early Sunday morning for the potential of severe, damaging wind gusts near 60 mph in squalls and possibly a tornado.
- Moderate coastal flooding potential continues through tonight and possibly Sunday
- Moderate oceanside coastal flooding is possible this evening and overnight throughout the Florida Keys as winds become more southeasterly, then shift to the south and southwest. Water levels may reach near 1.5 feet above normal high tides. Heavy wave action will likely cause significant overwash of seawalls, docks, with wave runup into exposed oceanside streets and yards this evening and into the night.
- As winds shift from the southwest during the early morning hours Sunday, there is the potential for moderate Gulfside and Bayside flooding, with water levels reaching near 1.5 feet above normal high tides. The most likely times for this flooding would be during the early morning hours Sunday along the Lower Keys and Middle Keys, and possibly along the Bayside of the Upper Keys Sunday afternoon and early evening.