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4/17-18 snow threat


ORH_wxman
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4 minutes ago, Cyclone-68 said:

First inch for Boston this late in 33 years would be remarkable 

BOS is a lock to get at least an inch.

Any ptype algorithm that has BOS as rain with a 950mb temp of like -0.5C is tossed. (I'm looking at you GFS)

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Just now, CT Rain said:

Random question for Will... the famous May 1977 snow map you have nothing in the valley but BDL had 1.3". Was that an unusual total for the valley spots? 

I remember and have it written down in my wxbook Ryan having 4 inches in Ashaway RI at 75 feet asl. I also recorded 6.5 at 200 feet at my buds house up the hill. It melted so fast many stations didn't record anything 

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Just now, CT Rain said:

Random question for Will... the famous May 1977 snow map you have nothing in the valley but BDL had 1.3". Was that an unusual total for the valley spots? 

Yeah I actually must have just omitted or accidentally forgot to plot BDL on there. I do remember getting a much of traces on the valley locations. A lot of them being coops that probably waited until the morning of 5/10 to measure so they may have not captured measurable that had fallen the previous evening.

That's always a risk with doing maps of veyr late season events....your data is more susceptible to obs time biases.

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6 minutes ago, ORH_wxman said:

Yeah I actually must have just omitted or accidentally forgot to plot BDL on there. I do remember getting a much of traces on the valley locations. A lot of them being coops that probably waited until the morning of 5/10 to measure so they may have not captured measurable that had fallen the previous evening.

That's always a risk with doing maps of veyr late season events....your data is more susceptible to obs time biases.

Updated, lol:

 

May1977snowfall.png

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4 minutes ago, CT Rain said:

hahah that's great

Yeah I know there's probably amounts in other parts of the valley, but we can only go with the data we have and maybe extrapolate to a reasonable distance.

But it was def bugging me after you said BDL had 1.3"....surprised I missed a first order station, so I at least wanted to get that on there.

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