I’ve noticed that Windy has an HRRR forecast going out 36 hours, yet I can only find an 18 hour version on FlowX. Am I missing something? Are there plans to include the 36 hour HRRR in the near future?
David
I’ve noticed that Windy has an HRRR forecast going out 36 hours, yet I can only find an 18 hour version on FlowX. Am I missing something? Are there plans to include the 36 hour HRRR in the near future?
David
HRRR releases an extended (48 hours) forecast for the 0000, 0600, 1200, and 1800 hour forecast runs. It is only 18 hours for the other runs in-between (0100, 0200, 0300…).
Precipitation, temperature, wind in HRRR have sub-hourly (15-minute) time frames. the extended runs don’t have sub-hourly time frames extending beyond 18 hours.
The questions is whether there is value in the HRRR 48 hours vs the NAM 3km/60 hour model, which has the exact same domain.
I have some code design in mind for coping with these mixed forecast range models but I haven’t added this to the app yet. This is part of the major rewrite of the backend code.
NAM is a terrifically old model. The NMM WRF hasn’t been supported for many years.
I thought NAM 3km and HRRR were similar models/code but that memory was from over 7 years ago so it’s probably not reliable.
Essentially, I have code on the server to save the “current”, “previous” and “extended” forecasts so that the use can choose which to see in the app. The app still needs the supporting code though. This will come in the future.
NAM is based on the WRF-NMM, which I don’t think has been updated since 2014.
HRRR uses WRF-ARW.
Thanks. Which one do you use for Expedition Marine?
ARW, but quite a different physics configuration than HRRR.
I was also curious about the HRRR extension to 48h forecast every 6h. I’m not really familiar enough with the different models to know if it’s really better. I’ve generally found HRRR to be better for day hiking and knowing “will it rain soon?”, but that’s mostly because of the non-extended HRRR update frequency. Maybe an up-to-date NAM is just as good for more than 12h out? I’m not sure.
I just checked, and only realized now that the NAM update frequency is the same as the extended HRRR at 0000, 0600, 1200, and 1800. If they were staggered it would be worth it for that alone.. but they’re not.
Anyways, I was just curious if it was possible to see the extended HRRR forecast in the app, but I don’t really know which is better either.
No. Not yet.
I am slowly adding the features required to show the extended HRRR. The issue is that the extended HRRR will be replaced by the subsequent HRRR forecast an hour later. So I need to tag the forecast as extended so it’s not deleted after it is replaced, and also so that I can show it as a background layer on the map, just like HRRR falls back to NAM 3km and GFS.
The pieces are being added but haven’t been put together.
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