textproduct: Melbourne

KEY MESSAGES

Issued at 154 AM EDT Sun Oct 11 2026

- Another round of showers and storms is forecast today, with 60-80% coverage expected. Near and especially south of Orlando, there is a 5-10% chance of excessive rain amounts of 3" or greater. This may lead to localized flooding.

- Remaining warm and muggy today, with peak heat indices from 100 to 105 degrees along the Treasure Coast. A cold front will deliver less humid conditions beginning Monday.

- There is a moderate risk of life-threatening rip currents at Central Florida Atlantic beaches today. Swim near a lifeguard, and never swim alone.

DISCUSSION

Issued at 154 AM EDT Sun Oct 11 2026

-----------Synoptic Overview-----------

Deep-layer southerly flow persists over the Florida Peninsula early this morning. Low pressure associated with the remnants of Isaias sits near Chattanooga, TN, with a cold front extending into the NE Gulf. This continues to funnel unseasonably high moisture over the area, with PWAT values in excess of 2.3". Over the next 24 hours, this disturbance will slowly move eastward, with its attendant cold front arriving over Central Florida this afternoon. By Monday morning, it should exit to the south of the district.

Unusually strong high pressure at H5 sits over the Western Atlantic, with heights over 597 dam near Bermuda. As the shortwave trough associated with Isaias moves into the Atlantic, this ridge will flatten, and another strong anticyclone will replace it over the Gulf by Monday. Weak northwesterly flow will force much drier air over Florida through at least early Wednesday.

By mid-week, an inverted trough is forecast to be passing through the NW Caribbean Sea. Strong high pressure should still be located over the Deep South. East-southeasterly flow in the lower troposphere will begin to advect moisture back over the southern half of the state during the second half of the week. Guidance has shifted earlier and farther north with the return of near- to above-normal moisture, particularly from Thursday into Friday.

The ensemble suite continues to struggle to resolve the mid-latitude pattern late this week and into next weekend. This seems to stem from the interaction between a cut-off low over the southern Rockies and a polar jet streak diving out of the Canadian Prairies. GEFS members strongly phase these features, digging an unseasonably deep trough into the Ohio Valley by Saturday. The EPS suite shows less phasing, with the northern stream carving out a broader trough over the Northeast U.S. Cluster analysis of the 10/12Z guidance showed a nearly 50/50 split in outcomes, but the early- arriving 11/00Z guidance has trended more toward a phased solution. For Florida, more phasing and a stronger trough would send a cold front toward the state by Saturday.

-------Sensible Weather & Impacts-------

Through Tonight...

With a convergent stream of tropical moisture focusing over Central Florida, we will continue to see numerous showers and a few storms. A few storms may produce wind gusts from 40-50 mph today. Where repeated rounds of heavy rain occur, we will monitor for localized flooding due to already saturated soil. Looking at the 95th percentile of the REFS members, areas from Cape Canaveral to southern Osceola County and points southward stand the highest chance of locally excessive rain through this evening. In this area, there is a 5-10% chance of rainfall amounts exceeding 3".

The weak cold front approaches the I-4 corridor by late this afternoon. It should then slowly work southward, reaching Lake Okeechobee before daybreak on Monday. Somewhat less humid air will quickly suppress rain chances once it passes your location. Some low shower chances linger tonight mainly near Lake O and along the Treasure Coast.

Highs today remain above normal over the Treasure Coast, in the upper 80s to low 90s. Elsewhere, highs reach the mid to upper 80s. Tonight's low temps will turn a bit cooler to the north of the front, with upper 60s to near 70 along I-4 and low to mid 70s southward from there.

Monday - Tuesday...

A break from the wet weather arrives to begin the work week. Much drier air will mix to the surface on Monday afternoon, allowing dew points to drop into the mid 60s to near 70. Under mostly sunny skies, highs will still be warm in the mid to upper 80s. Widespread mid to upper 60s are expected for lows Monday night, except low 70s right along the immediate coast south of Melbourne.

Some boundary-layer moisture returns from the Atlantic on Tuesday. While a few sprinkles are possible, the most likely outcome is just some intervals of cloud cover. Seasonably warm temps prevail in the afternoon.

Wednesday - Friday...

As moderate onshore flow commences, one notable change is an earlier return of sufficient moisture for a few showers during the second half of the work week. Through Thursday, these chances range from 20-40% generally south of Orlando before increasing to 30-50% area-wide on Friday. Lightning probabilities look quite low through at least Thursday.

Partly sunny skies should continue, with high temps near to just above normal in the mid to upper 80s.

Next Weekend...

Uncertainty grows as we monitor multiple disturbances and their potential impact on our local weather. As mentioned in the overview, a trough over the Ohio Valley and/or Northeast may drag a cold front toward the state or reinforce high pressure to our north. A stronger front could draw deeper moisture northward, increasing chances for showers and storms as it does. It's too early to tell for certain. Statistical guidance has 40-50% rain chances on Saturday area-wide, when a front could be making its approach.

With either outcome, surface high pressure is expected to pass well north of Florida late in the weekend and early in the following week. A period of brisk onshore flow is probable beginning either Sunday or next Monday (10/19), sparking rounds of onshore-moving showers.

Highs should remain in the 80s through Saturday. The deterministic NBM is forecasting highs in the 70s from Orlando northward next Sunday, indicating the potential for a stronger front to reach Florida.

MARINE

Issued at 154 AM EDT Sun Oct 11 2026

A weak cold front will drift into the Central Florida Atlantic waters later today before exiting toward the south on Monday. Offshore-moving showers and a few gusty storms remain possible through this evening ahead of this feature. Northwest to north breezes will push much drier air over the area from Monday into Tuesday. Flow turns onshore by midweek as the surface high settles across the southern Appalachians.

South to southwest winds 10-15 kt today, except 15-20 kt in the morning offshore and north of Cape Canaveral. Winds turn northwest on Monday, 10-15 kt, then north-northeast on Tuesday around 10 kt. Winds will continue to veer onshore by midweek. Seas generally 2-4 ft, except up to 5 ft in the Gulf Stream north of Cape Canaveral on Monday.

AVIATION

(12Z TAFs) Issued at 620 AM EDT Sun Oct 11 2026

Mainly VFR but patchy IFR/MVFR stratus possible through 14Z or so. A weak front is forecast to push into central FL late in the day. Initial south wind component (S/SW) will become more westerly during the aftn. Early onset of SHRA across northern terminals (LEE) and southern terminals (VRB-SUA) with coverage increasing this afternoon. Could see a couple rounds of storms south of MCO this afternoon and early eve where higher moisture/instability reside. Lingering SHRA and isold TSRA should linger past 00Z across the southern terminals. A wind shift out of the NW tonight with drier air filtering in.

PRELIMINARY POINT TEMPS/POPS

DAB 85 67 85 67 / 50 10 0 0 MCO 86 70 86 68 / 60 10 0 0 MLB 88 71 85 70 / 80 20 0 0 VRB 90 72 85 68 / 80 30 10 0 LEE 82 67 85 67 / 80 0 0 0 SFB 85 67 86 67 / 60 10 0 0 ORL 86 69 85 68 / 60 10 0 0 FPR 90 72 86 68 / 80 30 10 0

MLB WATCHES/WARNINGS/ADVISORIES

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