Conditions
What it watches for
Next Light doesn't watch the weather. It watches for 14 specific looks — the kind of light and air you'd set an alarm for — and tells you when one of them is lining up on a photograph you've already made.
None of these is a weather category. Each one is a particular combination of ingredients with its own ways of falling apart, and the ways it falls apart are the useful part: they are what decides whether the drive is worth making.
First light
Made overnight and mostly gone by mid-morning. For every one of these you have to be standing there before the sun is, which is why knowing the night before is the whole point.
Fog & mist
Mist softening the scene, light filtering through it
The whole look lives in a narrow band — thin enough for light to rake through it, thick enough to still be there. Too little and it is just a damp morning; too much and you are standing inside white with nothing in front of you.
Freezing fog
Freezing fog closing in, thick and obscuring
Supercooled fog, thick enough to rime every branch it settles on. The fog is the part that can be seen coming — the rime is not, and some mornings the air is cold enough and damp enough and the fog still never sets.
Frost
A white crystalline coat over the cold morning ground
Frost is made overnight, not at dawn: it needs a clear, still, genuinely cold night for the ground to give its heat away, and one blanket of cloud undoes all of it. Then it is a race with the sun, which takes it back not long after it reaches the ground.
Low cloud blanket
An even low ceiling capping the sky, flat and grey
Not a cloudy morning — a lid, low and unbroken. What matters is that it holds: a deck that breaks halfway through hands you hard light in the middle of a soft-light photograph, and one that settles all the way down puts you inside it rather than under it.
Valley fog
Fog pooled low in the valley, light above it
The cold-season one you climb above — fog pooling on the valley floor overnight and still sitting there at first light, with clear air over the top of it. What it gets confused with is a grey lid overhead: the same view from the car, a completely different photograph, and telling those two apart is most of the work.
Through the day
Not pinned to sunrise. Some of these are a sky that can hold for hours; others only switch on when the sun is low, and follow the hour your own photograph was made at.
Clear open sky
Open, cloudless sky from edge to edge
Clear is the promise; deep blue is not. A thin high veil can sit over an otherwise empty sky and pull the saturation out of it without ever reading as cloud, and haze does the same to the distant ridgelines that made you want the frame.
Colorful sky
Warm color low in the sky over a mostly-clear canvas
Color needs a path, not just a clear sky. The light travels a long way at that hour, so cloud sitting low toward the sun can take it away while the sky above you looks perfect — and haze does the same thing more quietly, greying the warmth down from behind.
Fair-weather cumulus
Puffy white clouds drifting across an open sky
Puffs need dry air underneath them — the same amount of low cloud in damp air comes out as ragged stratus, which photographs nothing like it. The other quiet spoiler is a high sheet above: it flattens the light and the clouds stop having edges.
Falling snow
Snow falling soft, muffling the whole scene
Flakes in the air, distance going soft. The difference between that and cold rain is a degree or two, which is why the temperature is watched as closely as the snow — and wind is the other spoiler, since enough of it turns gentle flakes into a whiteout with no scene left in it.
High cirrus sky
Wispy high streaks brushed across the sky
How much high cloud there will be is knowable. Whether it arrives as distinct streaks or a milky veil is not — no forecast sees texture — so that gap gets said out loud instead of papered over. What it does need is an open sky underneath, or the streaks are never seen at all.
Rain & wet mood
Falling rain, wet surfaces and a moody grey sky
What you want is soft, steady rain, not a downpour: a soaking is a different photograph and a worse one, so the heavy end counts as a failure rather than more of a good thing. Rain is also local in a way cloud is not — it can fall a valley over and never reach you.
Soft overcast light
Soft shadowless light, evenly diffused and gentle
The least dramatic sky here, and the one that rescues the most subjects — nothing blows out, nothing blocks up. It is best in the hour after rain, when the greens go saturated and the air is still enough to hold a long exposure, and it is over the moment the sky breaks open.
Still water reflection
Glassy calm water mirroring the sky above
Wind is the only thing that matters, and it is unforgiving: one gust between calm spells is enough to take the mirror away for exactly the minutes you needed it. Cloud is not the enemy here — an empty sky reflects as an empty sky — so what gets matched is the sky your own photograph had.
Windswept & dynamic
Wind-driven motion — bending grass, streaking cloud
There is a band where wind is the subject — grass laid flat, water streaked, cloud tearing past — and on either side of it there is either nothing to photograph or nothing you would want to stand in. Rain on top of that wind turns dramatic into miserable, which gets called out rather than left for you to discover.
This page is generated from the app itself. The conditions listed here are exactly the ones it watches for — the list can't quietly fall out of date, because there is only one of it.
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