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NOAA Space Weather Prediction Center — planetary K-index, observed and 3-day forecast (JSON)

Read
yes, on the basis of a feed or service it offers for others to read
What the paper uses
figures and listings, credited
How it is read
open-data API
Its own page
NOAA Space Weather Prediction Center — planetary K-index, observed and 3-day forecast (JSON)
Terms
its terms, read 2026-10-23: “may be used without charge for any lawful purpose”
Licence
Public domain (U.S. National Weather Service) — linked wherever the paper credits it
Permission
not yet asked
Credit
Source: NOAA Space Weather Prediction Center
Decided by
the paper's publisher, 2026-10-23 (owner, 2026-10-23: "NOAA good" (aurora prediction for the now dial))
Notes

The aurora block on the now dial (pipeline/sources/aurora.py): the highest Kp NOAA forecasts for tonight in Edmonton, with the 3-hour slots behind it, observed, estimated and predicted as NOAA labels them. Kp is a planetary forecast of geomagnetic activity, not of visibility: the dial says "NOAA forecasts", never that aurora will be seen.

The JSON changed shape before 2026-10-23: it was a header row followed by arrays and is now a list of objects. The parser reads keys by name, never position, and a row whose kp is outside 0-9 is dropped (a value present and false becomes absent). An absent forecast is "unknown" on the page, never "quiet". Related products, not read: 3-day-geomag-forecast.txt (storm probabilities by day), 27-day-outlook.txt (weekly; disagrees with the 3-day product for overlapping days, so the two are never mixed), ovation_aurora_latest.json (a 30-90 minute nowcast, 919 KB). NOAA removed its experimental aurora "viewline" in May 2026, so no "visible from here" line is stated anywhere.

If this is yours and you want it left out, write to [email protected]. We stop reading it and withdraw everything that cited it, past editions included. Every source · How this paper is made