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The local radio station says they will give an "hour-by-hour" or "hourly" weather forecast, but then gives what the expected temperatures and weather will be at 8am, 12pm, 4pm and 8pm rather than a forecast for each hour.
Is there a better (but still quick) way to describe the forecast?
Edit: To clarify, I am talking about a single forecast where they give the weather they expect to see at 4 different times through the day.
Every four hours or at 4, 8 and 12. Sometimes a single word Is too obscure and sounds contrived.
There's no word I know of that specifically denotes four hour periods as other terms can (hourly, daily, weekly, fortnightly, bi-weekly, monthly, bi-monthly, annually, quarterly etc).
I would suggest that four-hourly would probably work best here.
Tune in for our four-hourly weather updates at eight, twelve, four and eight.
Or just use verbalise the meaning:
Tune in for weather updates at eight, four, twelve and eight.
We have weather updates every four hours, at eight, four, twelve and eight.
I have worked in meteorology, and the data for weather monitoring typically comes in hourly chunks, but the forecasts are updated on a different schedule (in part because equipment/software can fail to check in every hour). But to answer your question...quadhourly seems like it could be the word. Or perhaps quarterdaily or periodically. In searching for an answer, I have to wonder what you would call morning, afternoon, evening, and night other than times of day because they describe each respective period well on their own.
