textproduct: Melbourne

KEY MESSAGES

Issued at 247 PM EDT Sat Jun 27 2026

- Scattered showers and storms this afternoon and early evening will be capable of gusty winds, frequent lightning, and heavy downpours which may lead to localized flooding with slow movement of storms. A strong storm cannot be ruled out.

- Lower rain chances overall on Sunday before moisture increases early next week as a surface boundary approaches. Rain and storm chances increase through at least Wednesday as a result.

- Hot and muggy conditions persist areawide with peak heat indices 100-107F each afternoon. A Moderate to Major HeatRisk is forecast each day.

DISCUSSION

Issued at 247 PM EDT Sat Jun 27 2026

Today-Tonight... Upper level high pressure across the southern US will remain in place as a trough moves into the northwestern US. At the surface, high pressure will continue to extend over the Florida peninsula from the Atlantic, with the axis of the ridge remaining draped over central Florida. Locally, this will promote light southerly winds to persist. The east coast sea breeze is forecast to form each afternoon and push inland, with winds turning southeasterly behind the sea breeze. Isolated to scattered showers and storms are forecast to form each day along the sea breeze as it pushes inland, with activity increasing during the afternoon hours as the sea breeze pushes inland. There is a medium (30-60 percent) chance of rain and storms this afternoon and into the early evening. The highest coverage of storms will be across the interior later this afternoon where the east and west coast sea breeze are forecast to collide. The environment is supportive of convective development, with plenty of instability ( 1700-2500 J/kg of MUCAPE ), cooler temperatures aloft ( -7 to -8C at 500 mb), and decent downdraft potential (DCAPE of 700-1000 J/kg). The main storm hazards will be frequent lightning strikes, wind gusts of 40-50 mph, small hail, and locally heavy rainfall with a low chance for localized flooding where storms move slowest. Storm motion will be slow and erratic, following outflow and sea breeze movement. Main storm hazards from stronger storms will be frequent lightning strikes, wind gusts of 40- 55mph, small hail, and brief heavy down pours with a low chance for localized flooding where storms move slowest. A brief funnel cloud may be possible along the sea breeze collision later this afternoon/early evening. Any lingering activity will dissipate or move offshore before midnight, become dry overnight.

Hot and humid conditions once again today, with afternoon highs in the low to mid 90s. These temperatures coupled with high humidity will produce peak heat indices of 102-107 degrees, and supporting a Moderate to Major HeatRisk areawide (especially from northern Osceola/Brevard northward. If you are planning to spend time outdoors, take plenty of breaks in the shade or A/C and stay well- hydrated to avoid heat-related fatigue/illness. Never leave pets or children in vehicles unattended! Warm and muggy conditions continue into tonight, with overnight lows in the low to mid 70s.

Sunday... Upper level high pressure stretching from Texas to the Gulf to Florida will remain in place Sunday as a trough across the northwestern US steadily shifts eastward. At the surface, high pressure across the western Atlantic will continue to stretch across the Florida peninsula, with the ridge axis remaining draped across central Florida. Locally, this will promote light southerly winds to persist. The east coast sea breeze is once again forecast to form in the afternoon and push inland, with winds turning southeasterly behind the sea breeze. Isolated to scattered showers and storms are forecast to form each day along the sea breeze as it pushes inland, with activity increasing across the interior as the sea breeze pushes inland through the afternoon and into the early evening.

There is a slightly lower chance for convection on Sunday compared to today, with rain chances 20-50 percent, as model discrepancies continue with how much dry air will be present across the Florida peninsula. Have continued to lean closer to NBM guidance with PoPs as a middle ground at this time. The environment supports convection development, with plenty of instability ( 1800-2500 J/kg of MUCAPE ), and decent downdraft potential (DCAPE of 700-1000 J/kg). However, temperatures aloft are slightly warmer than they have been (-6 to - 7C at 500mb). The main storm hazards will be frequent lightning strikes, wind gusts of 40-50 mph, and locally heavy rainfall.

The heat persists, with afternoon highs in the low to mid 90s. The warmest afternoon temperatures are forecast across the Orlando metro and areas northward. These temperatures combined with high humidity will produce peak heat indices of 100-107F. Additionally, widespread Moderate to Major HeatRisk is forecast across east central Florida, meaning most individuals will be more susceptible to developing heat- related illness if not practicing heat safety Warm and muggy conditions are forecast overnight, with forecast lows in the low to mid 70s.

Monday-Friday... Upper level ridge across the southeastern US will remain in place with a trough moving southward along the eastern flank of the ridge early next week. At the surface, a low pressure system will form off the coast of the Carolinas, with the low dragging a weak boundary southward towards the Florida peninsula early next week. Some uncertainty remains with the exact timing and evolution of this feature, but consensus has the low forming off the coast of Georgia/Carolinas Monday or Tuesday, meandering slightly before eventually moving westward. Model guidance continues to keep the quasi-stationary boundary just north of central Florida through most of the period before drifting southward late into the week. Locally, this will cause moisture to increase across the area, with forecast PW values 2+". This increase in moisture will support greater rain and storm chances areawide through next week. There is a medium to high (40-70 percent) chance of rain and lightning storms each afternoon. However, models diverge a bit with regard to available moisture Thursday onward, so rain chances may settle closer to normal toward late week, will continue to monitor closely.

Hot and humid conditions are forecast to persist through next week, with afternoon highs in the low to mid 90s. These temperatures combined with high humidity will produce peak heat indices of 100- 107F, with widespread Moderate to Major HeatRisk is forecast across east central Florida through next week. Warm and muggy conditions will persist each night, with overnight lows in the low to mid 70s.

MARINE

Issued at 247 PM EDT Sat Jun 27 2026

Today- Wednesday... (Modified Previous Discussion) Generally favorable boating conditions will last this weekend into next week as light southerly flow turns onshore each afternoon with the east coast sea breeze. Winds generally 10-12 KT or less with seas 2-3 ft through the middle of next week. Late night and early morning showers and an isolated storm or two will transition inland during the afternoon hours through Sunday, though some pushback of evening storms could occur as we get into early next week. Moisture increases as a surface boundary approaches Monday- Wednesday, so rain chances increase (particularly north of the Cape).

AVIATION

(00Z TAFs) Issued at 743 PM EDT Sat Jun 27 2026

Light southerly flow through much of the TAF period often becomes light and variable. A sea breeze tomorrow afternoon should shift winds east-southeast around 7-10 kts as it progresses inland. Lingering storms near MCO/ISM this evening are forecast to diminish by 01Z with mostly dry conditions overnight. Typical summertime convection trends are forecast tomorrow with isolated to scattered showers and storms first initiating along the coast by late morning and early afternoon spreading inland and increasing in coverage late in the day.

PRELIMINARY POINT TEMPS/POPS

DAB 76 93 77 94 / 10 20 10 60 MCO 76 95 77 95 / 30 40 20 60 MLB 78 90 77 92 / 10 20 10 40 VRB 77 91 77 93 / 10 20 10 30 LEE 77 95 79 95 / 20 30 10 60 SFB 77 95 78 96 / 20 30 10 60 ORL 77 94 78 95 / 30 40 10 60 FPR 76 91 76 92 / 10 30 10 30

MLB WATCHES/WARNINGS/ADVISORIES

FL...None. AM...None.