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1/21 Redeveloping Clipper Storm


DDweatherman

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My updated forecast is for 7 to 10 inches over most of MD, DE, NJ, se PA and n VA, with possible 12 to 14 inch max amounts just north of BWI to just south of PHL (and isolated to nw of IAD).

 

Cold air will rush in late tonight in response to height crash and pressure falls, good times. Agree that thunder-snow quite possible Tuesday late afternoon, evening.

 

Large-scale motion of low on models may disguise tendency for double-centered formation in response to arctic front stalling over coastal waters, northern DE and n.e. MD could therefore be in blizzard conditions at times with a locally enhanced gradient around a western secondary center. There could be a double-secondary look to this and that second feature could be close to IAD before being absorbed around 7-9 p.m. Tuesday.

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ABC 7 does...they usually show a snow total with probabilities graphic.  They don't include the probabilities in their forecast map.

Someone like Bob Ryan had a very similar forecasting philosophy to CWG. So do a lot of government products.. they are just tucked into graphics and things most people never see.  I think there is a tricky balance there where you still want to try to actually give a forecast.. but if you don't know you don't know. Mets get on their own case more than the public does when they don't know. Public gets annoyed but keeps coming back because they realize predicting the future is hard... they still want you to give it something of a go though. 

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Someone like Bob Ryan had a very similar forecasting philosophy to CWG. So do a lot of government products.. they are just tucked into graphics and things most people never see.  I think there is a tricky balance there where you still want to try to actually give a forecast.. but if you don't know you don't know. Mets get on their own case more than the public does when they don't know. Public gets annoyed but keeps coming back because they realize predicting the future is hard... they still want you to give it something of a go though. 

 

Yeah, I definitely get why mets use probability forecasts especially in a lower confidence forecast.  I kind of like how ABC7 does it where they show their graphic of overall totals with probabilities but still gives their forecast map of the most likely scenario.  I sort of wish LWX would adopt something similar with their snow map but that'd be a lot of work probably.

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first weatherbell snowmaps too low now accuwx.. what is happening here??

is it surprising to anyone that bottom of the barrel private weather companies use cheap model-to-snowfall programs to generate their maps? obvious they both just convert everything to 10:1

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Lot of optimism in here. Doesn't DC often get screwed by northern stream systems and storms where we rely on some sort of redevelopment nearby/overhead? We have both here. I like the model consensus, but I am still cautious.

This isn't a miller b. There will be no pause-transfer-redevelopment. There is no dry slot anywhere near us. Precip breaks out as the vort digs below us just like a normal clipper but track of the surface low is ideal. There is only one low to worry about. Not some primary in wv/oh as we pray secondary off the coast gets going soon enough. No reason to be cautious unless you are expecting 6-10.

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Nuances forecast are kind of my pet peeve, prefer everyone to take a stab see who verifies best over time. Nuanced forecast is major CYA and I suppose is good for long term employment.

 

I much prefer probability forecasts.  They allow the end user to see the amount of uncertainty that exists and plan accordingly.  It also allows for better long term forecasts I think as well ... forecasters do not get hung up on 2-4 vs 3-6, etc.

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