Weather

Sector-wide moves change the whole world at once. Seven kinds, their exact thresholds, what they do to the sky and the objects, and how night works.

Kind	Day	Night	Headline
`semi-storm`			SEMICONDUCTOR STORM
`gold-rush`			GOLD RUSH
`oil-surge`			OIL SURGE
`rocket-day`			ROCKET DAY
`sunny`			SUNNY
`gloom`			GLOOM
`clear`			CLEAR SKIES

The seven kinds, day and night. Swatches use the exact tint colors and alphas from the scene; at night the tint is halved over a navy sky.

How weather is decided

GET /api/weather fetches quotes for 26 weather tickers (the indexes, the big semis, gold and silver, oil, the space names, a few megacaps, the nuclear and solar names, and the crypto proxies), then walks a list of rules in priority order and stops at the first one that fires. The result is cached 60 seconds. The sandbox asks every five minutes.

Priority	Kind	Rule	Movers shown
1	`semi-storm`	NVDA, TSM, AMD, MU and AVGO average -3% or worse	the five semis
2	`gold-rush`	GLD up 1.5% or more	the one ticker
3	`oil-surge`	USO up 3% or more	the one ticker
4	`rocket-day`	RKLB, ASTS and LUNR average +4% or more	the three space names
5	`sunny`	SPY up 1% or more	the one ticker
6	`gloom`	SPY down 1.5% or worse	the one ticker
7	`clear`	none of the above	SPY, when it has a quote

Priority matters. A day where chips are down 4 percent and gold is up 2 is a storm, not a gold rush, because the storm rule comes first.

What each kind does

Kind	Sky	World
`semi-storm`	near black tint at 72%; the sun is hidden; the UI on the banner turns light	every object with a semis driver puffs smoke; the storm tune plays
`gold-rush`	gold tint at 32%	gold-glow objects get a 1.6 times halo
`oil-surge`	orange tint at 40%	the banner says it is good news for rigs
`rocket-day`	a 12% white wash	the sky is busy, says the banner
`sunny`	warm yellow tint at 22%	sun out, nothing else
`gloom`	grey tint at 58%; the sun dims to 45%	everyone walks at three quarters speed; the storm tune plays
`clear`	no tint	the banner shrugs

The ground layers lean toward grey in a storm (42 percent) and in gloom (22 percent), and toward navy at night (50 percent). Stars come out at night and the moon replaces the sun. The banner at the top of the sandbox shows the headline, the detail sentence and up to six movers with their day change.

Day and night

Night is decided by the viewer's local clock, not the market's: from 20:00 to 6:00 the sandbox draws the night sky, halves every weather tint, and plays the night tune regardless of the weather. The sun and moon doodle on the daily page flips a little earlier, at 19:00. For screenshots, the sandbox accepts ?hour=22 to force an hour.