textproduct: Melbourne

KEY MESSAGES

Issued at 310 AM 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. 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 Tuesday 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 310 AM EDT Sat Jun 27 2026

Today-Tonight...Early morning RAP analysis indicates a surface ridge axis extending from the western Atlantic across central Florida and into the Gulf. With high pressure overhead, winds remain light and variable. KMLB radar intermittently shows a few showers moving from south to north across the Treasure Coast, and even a few blips between Okeechobee and Osceola counties. The focus for semi- organized showers (and an isolated lightning strike) will be south of the Cape and offshore through mid morning. Most inland locations will stay dry.

Very light southerly flow early on will veer east-southeasterly this afternoon as the sea breeze forms. A mostly sunny sky this morning will gradually become partly sunny around/after lunchtime as a cumulus field builds. If you see darkening cloud bases, there's a good chance a shower or storm is not too far off. Storm chances will increase from the I-95 corridor to points west after 1-2 PM as the sea breeze advances westward. It may be a bit slower to inch west along the Volusia coast, so rain chances may linger a couple more hours there before moving west with the sea breeze. Rain and storm chances are maximized after 4-6 PM across the interior, including portions of the I-4 corridor. The environment of ~2000 J/kg MLCAPE, 0-3km lapse rates of 8-8.5C/km (and higher), -7C H5 temps, and DCAPE close to 1000 J/kg will be in favor of convective development. However, poor mid level lapse rates, weak flow (negligible bulk shear), and elevated freezing levels are factors working against sustained convection. Storm motion will be slow and erratic, following outflow and sea breeze movement. After 5-6 PM, a west-east coast sea breeze collision is anticipated, near or just west of the Orlando metro. Happening right before sunset, this should provide the greatest coverage of showers and storms before the loss of daytime heating. Primary hazards from stronger storms include wind gusts of 40-50 mph, frequent lightning strikes, and brief heavy downpours. A storm early this evening along the sea breeze collision could be capable of 50-55+ mph gusts or a brief funnel cloud, but widespread severe weather is not expected. Some earlier CAMs suggested outflow-driven pushback of storms toward the Atlantic coast, but confidence in this occurring is low. Activity largely dissipates by 9-10 PM with drier conditions into early Sunday.

Temperatures will warm into the low/mid 90s by early afternoon, sending heat indices into the low 100s at that point. Peak heat index values are forecast to reach 102 to 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!

Sunday-Monday...H5 ridging becomes more pronounced during this timeframe, extending from the Gulf to WI/MI and the Great Lakes region. No real change is expected in terms of surface flow across our area, starting SSW in the morning and veering onshore in the afternoon behind the east coast breeze. Modeled QPF is lower overall on Sunday as forecast soundings show a bit of mid level dry air entrainment (especially farther south). This results in rain chances near or slightly below climo (15-25% nearer to the coast / 30-40% inland). Highs climb a degree or two in response to a bit more sunshine, but heat indices look fairly similar to today's forecast (could be a degree or two higher north of Orlando). Early next week, a weak trough or surface boundary advances toward north Florida, ans elongated PVA may boost rain chances along/north of I-4 Monday afternoon. Moisture increases at the same time with PW 1.9-2.1"+. This uptick in moisture should support heat indices climbing closer to the 103-108 range, especially north of I-4. A large portion of the area is forecast to reach Moderate/Major HeatRisk criteria, as warm/muggy overnight conditions give little relief to the daytime heat.

Tuesday-Friday...Slightly above normal rain chances look to continue Tuesday and Wednesday as the aforementioned trough and perhaps a brief surface low develops offshore of the NE FL and GA coast. Storm chances peak during the afternoon and early evening hours with gusty winds, frequent lightning, and torrential downpours being the main concerns. Models diverge a bit with regard to available moisture Thursday onward, so rain chances settle closer to normal toward late week. In addition, surface flow will become more onshore, carrying the higher rain chances west of I-95. A slightly stronger east coast breeze mid to late week means coastal locations could stay closer to the upper 80s/low 90s for daytime highs, with the low/mid 90s continuing inland.

MARINE

Issued at 310 AM EDT Sat Jun 27 2026

Mainly favorable boating conditions will last this weekend into next week as light southerly flow turns onshore each afternoon. Late night/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). Winds generally 10-12 kt or less with seas 2-3 ft through the middle of next week.

AVIATION

(12Z TAFs) Issued at 655 AM EDT Sat Jun 27 2026

Light and variable winds will pick up to 5 to 10 knots after 15Z, generally out of the south to southeast. The ECSB will develop and push inland, leading to increasing rain and storm chances across east central Florida. Peak coverage is forecast near the interior terminals, so have maintained PROB30s at the interior terminals between 19-23Z for VIS and CIG reductions due to TSRA. May need to upgrade to TEMPOs, so will monitor closely and amend as needed. Activity will diminish into the overnight hours, with light and variable winds forecast once again.

PRELIMINARY POINT TEMPS/POPS

DAB 92 76 93 77 / 40 30 20 10 MCO 94 76 95 77 / 60 50 30 10 MLB 90 77 90 77 / 30 20 20 0 VRB 91 77 91 77 / 20 10 20 0 LEE 94 77 94 78 / 60 40 30 20 SFB 95 77 95 78 / 60 50 20 10 ORL 93 77 94 78 / 60 50 30 10 FPR 90 76 91 76 / 20 10 20 0

MLB WATCHES/WARNINGS/ADVISORIES

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