Thunderstorm

Multirun, fixed 500 km total, as many runs as needed inside the dates. Scoring follows the mechanic — best total time on the distance once work is verified (detail in the Rulebook).

Clock (UTC). The race is open UTC from 00:00 on 1 October through 23:59 on 31 December. Only runs published to Thunderstorm in that span count; how the five hundred kilometres split across days is up to the entrant, within format and verification rules.

After the period ends. 31 December closes the live phase; official standings follow later. A gap of a few days before Results out is normal; heavier fields can take longer while verification clears. Provisional order can move until the race is Results out.

Five hundred kilometres from the first of October to the last day of December. Held even, that is about forty kilometres a week for thirteen weeks. Miss a week, and the rest of the quarter has to carry the debt. This is not a monthly fifty and not a city hundred: a line that stays live while the rest of the season turns over.

October opens with Quasar (50 km Multirun) and Guadalajara (Open). November brings Sparta (42 km) and Lisbon (100 km, through 31 December). Delta (Distance Ladder, 100 km) runs until 20 December. Short classics and Singularity come and go. Thunderstorm does not pause for any of them.

• Even weeks vs blocks — Keep the forty a week, or wait for a clear patch and pile kilometres. Five hundred is easy to undershoot if you wait for the calendar to get quieter.

• How to live with the season — Lisbon and Delta ask for volume of their own. Taking them on does not pause this race.

• Enter vs stay out — A verified 500 km across the quarter, or no line on this race. Skipping it is a choice that registers.

A completed 500 km multirun is a clean line: finished or not, inside the UTC dates or not. Late entry still works if the kilometres fit before 23:59 on 31 December UTC.

At Results out, the race locks; until then, provisional standings may still move.