RFE: Show REFC for high winds and storms when it becomes available. Perhaps for Grib_pi?

[rgleason]

David Burch advises simulated radar reflectivity (REFC) is a better parameter for predicting squalls than CAPE.

https://www.cruisersforum.com/forums/f134/new-grib-presentation-100414-4.html#post2892362

http://davidburchnavigation.blogspot.com/2018/12/squall-forecasting-in-puget-sound-maybe.html

[rgleason]

The thought that occured to me at the time was: did this squall show up in the new forecasts of simulated weather radar? These forecasts are available in the HRRR forecasts, and promise to be a key parameter for inland and coastal sailing, in that they should be able to forecast squalls in an easy to understand manner. This parameter is also available offshore in FV3-GFS data. We discuss this parameter and how to use it in our textbook Modern Marine Weather, 3rd Ed.

Much of the HRRR data is available from third party sources beyond using direct access from NCEP,

"...that can seamlessly download and then display this special parameter " Grib_pi?

David writes:"

The other related news is NWS switches GFS to FV3-GFS on June 12. After that date GFS will include REFC globally. Last time i checked, the latest grib plugin for opencpn showed this parameter nicely.

The only issue to resolve is the color bar as there is a standard one for this. Europe and US are slightly different, but the European one is better. I have notes on this that i was going to post but did not get around to it yet.

[rgleason]

https://www.cruisersforum.com/forums/f134/new-grib-presentation-100414-6.html#post2892438 Fogmachine reports:

NOAA's switch to the FV3 model will be transparent to O, though it will need to be modified to use REFC.

HRRR is more work - O uses Mercator projection while HRRR and the RAP that it's based on are on a Lambert Conformal Conic grid. It's a bit of math to reproject, but maybe O uses GDAL or Proj.4 for this.

Last I checked ZyGrib / QtVLM hadn't yet implemented LCC though they know about it.

HRRR has been fairly accurate for racing and race planning on both the East and West Coasts of the US, though that's not its primary purpose.

Didier added to Grib_pi https://www.cruisersforum.com/forums/f134/new-grib-presentation-100414-6.html#post2892885 I see in the OpenCPN commits that did-g has gotten PR's merged for

saildoc HRRR
saildoc parameters
add m_cbREFLC
add m_pReflectivity
Noaa use surface temp for [water](https://www.cruisersforum.com/forums/tags/water.html) temperature

https://github.com/OpenCPN/OpenCPN/i...ment-479727876

[rgleason]

Grib_pi has been updated for this RFE and it will be available in the next version