heat
THE SOUTH-DALMATIAN COAST — THE HEAT PEAKS TODAY NEAR 34 °C WHILE THE WIND PULSE FIRMS TO ABOUT 80 KM/H
On the board · September 21, 2026 →
PEAK · September 21, 2026 · NO. 0921
THE DOME
Internal situational context on our own monitored locations — not a warning, and not a customer claim. The south-coast and island heat peaks today : 34.1 °C at the Korcula ferry and port zone with an apparent 31.7 , 33.5 with an apparent 33.2 at the Stari Grad ferry port on Hvar, 31.8 at Supetar on Brac, 31.6 on the Neretva corridor. The coastal-wind pulse firmed further — 22.3 m/s, about 80 km/h , in-window at the Sveti Rok tunnel on the Velebit, 19.5 at the Port of Gruz and 17.5 at Dubrovnik Airport — while the wet-storm window rebuilt to 45 to 55 percent on the south coast and islands. The precipitation signal keeps oscillating, flagged so the swing is not read as noise. There is no official orange on this coast , so this is a watch signal rather than a warning.
THE RECORD
10 turning points on record since Sep 8 — the 8 most recent shown.
Sep 21 cresting → peak
Sep 20 building → cresting
Sep 19 cresting → building
Sep 18 ↑ moved up the board
Sep 17 ▽ slipped down the board
Sep 15 easing → cresting
Sep 13 peak → easing
Sep 12 cresting → peak
WHO IT TOUCHES
Maritime a fishing fleet with a 72-hour window, an island ferry network inside a transitioning typhoon, and a coastal wind pulse firming to about 80 km/h
Events a games show's final day and an equestrian programme already cancelled, and a spring holiday under an orange storm alert
CONNECTED
The cleared board and the firming footprint are the same high-pressure pattern seen from two distances.
WHAT THEY'RE SAYING
searched 34 vetted voices and the open field — nothing said about this system cleared the screen.
SOURCES — EFFIS/JRC with Copernicus-cited press, Sep 8 2026 · Italy Protezione Civile via met-press relay, Sep 17 2026 (reported) · Meteoalarm warnings JSON feed, read Sep 15 2026 (Croatia clear at orange and above) · Tomorrow.io v4 REST CI pre-step, daily-weather-brief/_ci-footprint.json generated 09:20 UTC Sep 21 2026, 38 of 38 monitored locations read — INTERNAL situational context, not customer or prospect exposure and not a warning. South-Dalmatian daily maxima peaking Sep 21: Korcula ferry and port zone 34.1 °C with an apparent 31.7, Stari Grad ferry port on Hvar 33.5 °C with an apparent 33.2, Supetar on Brac 31.8 with an apparent 30.2, the Neretva corridor 31.6 with an apparent 30.0, Zadar Airport 31.1 with an apparent 29.7. In-window maximum winds: Sveti Rok tunnel on the Velebit 22.3 m/s (about 80 km/h), Port of Gruz 19.5 (about 70), Dubrovnik Airport 17.5 (about 63), Korcula 16.2 (about 58), Port of Split and the Marjan interface 15.7 (about 57), D8 Makarska-Dubrovnik 14.0 (about 50). Wet-storm window 45-55 percent on the south coast and islands. No monitored location falls inside an official red or orange warning zone today, and no Croatian colour tier is asserted anywhere on this page. In the United States the central-Illinois airport point carries a 96 percent precipitation probability inside the Midwest flash-flood SLIGHT zone after an apparent 33.0 °C on Sep 20, and Lincoln Financial Field in Philadelphia cools from a 24.3 °C peak on Sep 20 to about 17.4 by Sep 22. · Tomorrow.io v4 REST CI pre-step, daily-weather-brief/_ci-footprint.json, generated 09:14 UTC Sep 20 2026, 38 of 38 monitored locations returning — INTERNAL situational context, not a customer or prospect claim: a south-Dalmatian temperature peak on Sep 20-21 with Stari Grad on Hvar at 33.9 °C daily maximum and 33.4 °C apparent on Sep 21, Korcula 33.5 and 32.2, Supetar on Brac 32.8 and 32.2, Zadar Airport 31.8 and 30.2, Sibenik 31.8 and 30.3 and Split Airport 30.8 and 30.1; a coastal bura wind pulse with daily maxima of 22.1 m/s, about 80 km/h, at the Sveti Rok tunnel on the Velebit crossing, 19.6 m/s about 71 km/h at the Port of Gruz, 15.0 m/s about 54 km/h at Dubrovnik Airport and 14.9 m/s about 54 km/h at the Port of Split and at Marjan; and a coastal wet-storm window of 45 to 50 percent. In the United States the same pre-step has the anonymised Airport X location in east-central Illinois at 33.3 °C with 35.1 °C apparent on Sep 20, and Lincoln Financial Field in Philadelphia at 27.6 °C with a 94 percent precipitation-probability maximum and 1.1 mm of rain on Sep 20, easing to about 18 °C by Sep 22. No monitored location sits inside an official red or orange warning zone today. · Tomorrow.io v4 REST forecast API, read 09:15 UTC Sep 15 2026 (internal situational context) · Tomorrow.io v4 REST forecast API, read 10:15 UTC Sep 18 2026 (internal situational context) · Tomorrow.io v4 REST forecast API, read 11:11 UTC Sep 17 2026 (internal situational context) · Tomorrow.io v4 REST forecast pre-step, 38 of 38 monitored locations read at 07:03 UTC Sep 19 2026 — internal situational context, not a customer or prospect claim: no monitored location falls inside an official red or orange warning zone today. On the south Dalmatian coast the heat peaks about Sep 20 — Korcula 33.9 °C, the Stari Grad ferry port on Hvar 32.9 °C with an apparent 34.1, the Neretva and its delta 31.0 to 31.5 °C about Sep 21 and the Split coast 30.3 °C — ahead of a wet window on Sep 20 and 21 whose precipitation probability has REBOUNDED to 96 percent at Supetar on Brac and on the D8 between Makarska and Dubrovnik, 73 percent at Stari Grad, 72 percent in the Neretva delta and 71 percent at Vukovar on the Danube, the Sava through Zagreb and the Zagreb hospital cluster, against 20 to 35 percent in the previous day's read; a coastal wind and bura pulse follows about Sep 21 at 11 m/s in the Sveti Rok tunnel, 7.9 at the Port of Gruz, 7.1 at Sibenik and 6.7 at the Port of Split and Zadar. In the United States the east-central Illinois airport point is the live heat edge today at 34.5 °C with an apparent 36.8, inside the heat-advisory footprint, while Lincoln Financial Field in Philadelphia peaked Sep 18 at 29.3 °C with an apparent 30.1 and cools through a modest wet window on Sep 20 at 65 percent and 8.5 mm. · Tomorrow.io v4 REST forecast, 38 of 38 monitored locations, 09:13 UTC Sep 12 2026 (internal context) · Tomorrow.io v4 REST forecast, 38 of 38 monitored locations, 09:15 UTC Sep 11 2026 (internal context) · Tomorrow.io v4 REST forecast, 38 of 38 monitored locations, 09:38 UTC Sep 13 2026 (internal context) · Tomorrow.io v4 forecast API, read 07:03 UTC Sep 8 2026, 38 locations