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March 5th Snow Threat


WxUSAF

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After the last storm with the NAM getting surface temps and CAD right, I can't feel I can ignore the CAD setup that NAM gives us on March 3rd at the start of this event before changing over to rain around midnight. GFS isn't onboard with that, though, but GFS didn't get the CAD on yesterday's storm either.

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  On 3/2/2015 at 12:52 PM, nj2va said:

I don't think we've switched over yet by then. It seems we'd switch over ~81 at least in DC.

 

per Cobb 

 

DCA: hr 79 is sleet hr 84 is snow

IAD: hr 79 is sleet hr 83 is snow

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  On 3/2/2015 at 1:38 PM, mitchnick said:

Srefs are really a crappy tool...so many outliers

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  On 3/2/2015 at 1:38 PM, mitchnick said:

Couple of 20 inchers in there that need to be taken out. Yields more like 5-6.

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Correct. If it happens during the day we need like -15 to -20 departures. Much better odds if it happens at night. 

  On 3/2/2015 at 2:19 PM, EastCoast NPZ said:

If it's going to snow in march, then it would be very helpful to have it happen at night.  Overnight timing would be perfect.

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  On 3/2/2015 at 2:20 PM, snowfan said:

Correct. If it happens during the day we need like -15 to -20 departures. Much better odds if it happens at night. 

 

Yep, and even then you run the problem of melting unless you have (and keep) heavy rates.  I dislike the drip...drip...drip that accompanies daytime late-season snows.  

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