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December Banter Thread


H2O

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Here come the slew of dry/wet, looks bad/good GFS commentary.

The commentary is based off of the posters expectations. If someone was expecting 8" of all snow and a ton of moisture then their analysis is sad and upset....how's my 3" of sleet looking?

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I don't agree at all. I think everyone understands how difficult weather forecasting can be (despite how far we've come) and understands there is inherent uncertainty that should be expressed.

 

A forecast, for example, like this: 40% 3-6", 30% 6-10", 20% 1-3", 10% <1", tells you more than a forecast like this: 100% chance of 3-6".  

 

The first one says the forecaster believes 3-6" is most likely and that there is a 90% chance of accumulating snow that totals over 1". If things do in fact bust, based on the most likely outcome, it is most likely to do so by being more snowy. This is great information for a snow removal company who needs to prepare, for example.

 

The second one says, 3-6" is coming. That may or may not be correct; but, over time you'll see that 100% forecasts do end up causing more harm than good. Now you might say, well you can tell the viewers how it may bust more snowy or whatever...but then you are being probabilistic now, just without the raw numbers. ;)

I think the public prefers that you give them a single forecast scenario and attach a confidence value to the forecast.  Listing all the possible scenarios and attaching somewhat arbitrary probabilities (they can never be verified since it is a single event we are measuring) just seems to muddy the waters for most of the public.  At least that's the sense I get from the majority of the public.  The probabilistic forecast is better for city planners and educated weather weenies than the general public, IMHO.  The average joe doesn't care about all the other scenarios.  They want to know what the weather is gonna be not the 3 different things it "might" be. And the I know for a fact, the general public doesn't want to hear about how hard it is to forecast the weather, lol.

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