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November 2014 Banter


Kay

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Just wanted to give a couple updates. Starting December 3rd Sterling will be adding new winter zones to better enhance terrain features from Loudoun north and east across central MD. Also, all snowfall grids/forecasts will go out to 72 hours versus 48 hours for all eastern region offices. In addition...we have restarted our winter probabilistic forecasts. Some improvements were made in the offseason. Last year we were initializing the grids with a 32 member solution heavily based on the sref. This year WPC will now include a 57 member ensemble for their percentiles. 25 members of the euro ensembles will be weighted in.

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Just wanted to give a couple updates. Starting December 3rd Sterling will be adding new winter zones to better enhance terrain features from Loudoun north and east across central MD. Also, all snowfall grids/forecasts will go out to 72 hours versus 48 hours for all eastern region offices. In addition...we have restarted our winter probabilistic forecasts. Some improvements were made in the offseason. Last year we were initializing the grids with a 32 member solution heavily based on the sref. This year WPC will now include a 57 member ensemble for their percentiles. 25 members of the euro ensembles will be weighted in.

Sounds great, appriciate the update.

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Just wanted to give a couple updates. Starting December 3rd Sterling will be adding new winter zones to better enhance terrain features from Loudoun north and east across central MD. Also, all snowfall grids/forecasts will go out to 72 hours versus 48 hours for all eastern region offices. In addition...we have restarted our winter probabilistic forecasts. Some improvements were made in the offseason. Last year we were initializing the grids with a 32 member solution heavily based on the sref. This year WPC will now include a 57 member ensemble for their percentiles. 25 members of the euro ensembles will be weighted in.

All great news! I'm really excited to see how the new WPC probabilistic forecasts will work now that it seems it will be a lot more balanced given the new input.

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All great news! I'm really excited to see how the new WPC probabilistic forecasts will work now that it seems it will be a lot more balanced given the new input.

The concept remains the same on the min/most likely/ max product. We took into account feedback given from this page over the offseason. The products no longer say 10 and 90 percentile but min and max potential. We still use the WPC 10 and 90 as a starting point then edit as needed.

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All great news! I'm really excited to see how the new WPC probabilistic forecasts will work now that it seems it will be a lot more balanced given the new input.

The concept remains the same on the min/most likely/ max product. We took into account feedback given from this page over the offseason. The products no longer say 10 and 90 percentile but min and max potential. We still use the WPC 10 and 90 as a starting point then edit as needed.

 

Just got posted to twitter from @whatdoweseehere of the new WPC output grid. Looks like they just downscale the ensemble output by the methodology seen here. Looks pretty good to me.

B2Nkz8sIMAAlweR.jpg

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The concept remains the same on the min/most likely/ max product. We took into account feedback given from this page over the offseason. The products no longer say 10 and 90 percentile but min and max potential. We still use the WPC 10 and 90 as a starting point then edit as needed.

 

That's cool. We (as a forum) will still probably have debates about min/max potential regardless :P It's certainly a solid product when executed properly. Might be worth adding a footnote on the max/min stating that a greater range could imply greater uncertainty with the forecast, or something that visually represents the amount of confidence in the forecast. I know that forecast confidence is usually mentioned in the written discussions, but a lot of the time that can get lost when people just grab the graphic, throw it on Twitter and make their own conclusions just from the map.

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That's cool. We (as a forum) will still probably have debates about min/max potential regardless :P It's certainly a solid product when executed properly. Might be worth adding a footnote on the max/min stating that a greater range could imply greater uncertainty with the forecast, or something that visually represents the amount of confidence in the forecast. I know that forecast confidence is usually mentioned in the written discussions, but a lot of the time that can get lost when people just grab the graphic, throw it on Twitter and make their own conclusions just from the map.

You are right that's a problem. The product is mainly intended for use by emergency managers for planning. They understand the certainty/uncertainty best. It's unfortunate when people take the max and tweet it

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Welcome back! I enjoyed your insights last season, and look forward to hearing from you often this season. It is great to have another person on the board with an inside perspective and can further explain a lot of the products we all use both individually and when attempting to inform others.

Hope all has been well with you.

Thanks much! Good to be back. Thanks for the note.

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Just wanted to give a couple updates. Starting December 3rd Sterling will be adding new winter zones to better enhance terrain features from Loudoun north and east across central MD. Also, all snowfall grids/forecasts will go out to 72 hours versus 48 hours for all eastern region offices. In addition...we have restarted our winter probabilistic forecasts. Some improvements were made in the offseason. Last year we were initializing the grids with a 32 member solution heavily based on the sref. This year WPC will now include a 57 member ensemble for their percentiles. 25 members of the euro ensembles will be weighted in.

Awesome, thanks for the update. Post this in the winter thread in case it gets lost here. :)

ETA: just saw you posted in there already. Great minds...

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No kidding. They are everywhere. My dog does a good job chasing them off but they keep coming back. Lots of ground venison on the roads too.

 

i see a mother and baby every morning when taking the kiddo to daycare. but yeah, passed quite a few dead along the highway. 

 

Pity T-Storm Watch issued

 

SPC was having technical difficulties this morning, so watches were being sent out that didn't actually exist. 

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