textproduct: Key West

KEY MESSAGES

- Slight chances of showers and thunderstorms will persist through the middle of the week.

- Breezes will slowly begin slackening as a frontal boundary presses south across Florida this evening and overnight.

- Conditions are setting up for a potential cloud line to development over or adjacent to the Florida Keys on Tuesday. This would also carry a risk for possible waterspouts.

MARINE

Issued at 345 PM EDT Mon Jun 29 2026

Light to gentle easterly breezes will persist through the evening across most of the waters with the exception of gentle to moderate across the Straits of Florida. Starting tonight a frontal boundary will slowly bleed south across Florida and stall across central Florida sometime Tuesday through Wednesday. This will lead to breezes slackening through Wednesday evening and may support brief periods of light and variable breezes at times. By Thursday, high pressure across the area will gradually build allowing for breezes to peak overnight and lull during the late morning and afternoons.

AVIATION

(18Z TAFS) Issued at 345 PM EDT Mon Jun 29 2026

VFR conditions are expected to prevail across the island terminals through the forecast period. Easterly winds will be gradually decreasing through the period and are expected to be light to occasionally gentle by Tuesday morning. In addition, conditions are looking favorable for a potential cloud line to develop after 16Z/30th.

PREV DISCUSSION

Issued at 540 AM EDT Mon Jun 29 2026

A mostly uneventful night for the Florida Keys. KBYX has remained shower-free for the majority of the night, although some showers are popping up along some boundaries in our waters over the last hour or so. These showers have been light and short fused and so far none have made it to the island chain. Seen on MIMIC PWAT, dry air has moved into the area which is helping limit these showers. Temperatures along the island chain are in the mid 80s with dewpoints in the mid 70s once again making for muggy conditions. Along the Reef, wind observations are easterly at 10 to 15 knots. Today will be similar to previous with chances of showers and thunderstorms but nothing that will last long due to dry air in the area. A frontal boundary is expected to move down Florida later tonight but not much is expected for us to change. As the frontal boundary weakens the high that has been controlling our winds, they will start to slacken. Temperatures and dewpoints will remain similar to the following days so muggy and warm conditions will continue.

PRELIMINARY POINT TEMPS/POPS

Key West 83 92 83 92 / 10 20 30 20 Marathon 83 89 83 89 / 10 20 20 20

KEY WATCHES/WARNINGS/ADVISORIES

FL...None. GM...None.