SHADOW SEASON / D1 CONTEST RECEIPT

KORD · High ≥ 77°F

Chicago, IL · 20260912 · Settled

Simulation credits only. The probabilities below are locked entries; current forecasts cannot replace them.

The contract clock

MILESTONE	UTC
Published	Sep 08 · 15:49 UTC
Forecast deadline	Sep 11 · 06:00 UTC
Observed day starts	Sep 12 · 06:00 UTC
Observed day ends	Sep 13 · 06:00 UTC
Unresolved contract voids	Sep 20 · 06:00 UTC

1991–2020 ACIS daily normal, rounded at publication. Source: exact KORD ACIS daily maximum. Observing window uses local standard time in America/Chicago.

Scheduled opponents

IFS Ensemble versus ICON

WeatherNext 2 versus IFS HRES

Bye: AIFS Single. An eligible bye forecast still contributes to the common-case skill table.

Locked forecasts

0% · NO50%YES · 100%

>99%

98%

96%

96%

87%

MODEL	PROBABILITY	INITIALIZED UTC	RECEIVED UTC	CAPTURED UTC
AIFS	>99%	Sep 10 · 18:00 UTC	Sep 11 · 01:29 UTC	Sep 11 · 01:29 UTC
EPS	87%	Sep 10 · 00:00 UTC	Sep 11 · 01:13 UTC	Sep 11 · 01:13 UTC
HRES	98%	Sep 10 · 12:00 UTC	Sep 10 · 19:21 UTC	Sep 10 · 19:21 UTC
ICON	96%	Sep 11 · 00:00 UTC	Sep 11 · 04:32 UTC	Sep 11 · 04:32 UTC
WN2	96%	Sep 10 · 18:00 UTC	Sep 11 · 05:03 UTC	Sep 11 · 05:03 UTC

Positions & reserved credits

YES MODEL	NO MODEL	QUANTITY	YES PRICE	YES RESERVED AT ENTRY	NO RESERVED AT ENTRY	YES / NO REALIZED P&L
ICON	EPS	25	0.91460	22.86	2.13	+2.13 / -2.13

WeatherNext 2 / IFS HRES: Gap below 4 percentage points.

The observation record

Finalized contract result: YES · 88°F · Sep 16 · 06:21 UTC

FIRST SEEN UTC	HIGH	SOURCE	OBSERVATION HOUR	TREATMENT
Sep 13 · 09:35 UTC	88°F	RCC-ACIS StnData	24	Provisional reading

Inspect the evidence

Model versions and upstream calibration versions are unknown in this trial. The JSON contains the full frozen policy, entries, positions, and observation corrections.

Download this contest receipt (JSON) ↗

Contest ID: shadow-20260908-v1:KORD:20260912:D1