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1/29-1/31 OBS, Hiatus from mud winter - Snow, Arctic Front Squall, & Gigi approved cold


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Kinda interesting that lows (at least up this way) ended up colder than forecast, but winds were much less than forecast. I guess that's because of better radiational cooling and winds not mixing air around?

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6am, backroads, 

Now you see it...now you don't Pictures taken within 5 minutes of one another facing towards Phoenixville/Valley Forge

3" 3"

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1 hour ago, Rainshadow said:

How often does PHL set a record low (any record low for that fact these days) at Midnight? 

This morning's record is 3F, so they will very likely fall short.

That 8 is a pretty cheap record low for coldest time of the year

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24 minutes ago, tombo82685 said:

That 8 is a pretty cheap record low for coldest time of the year

It was the cheapest record low for the month.  Now 1/30 is tied for cheapest record low with 1/2.

Here are the record lows for PHL, not too many 2000s in there.  Highlighted was the latest (closest) year for each month.

3.JPG.401eeacd2635b275fc746a905641b134.JPG

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1 hour ago, eastonwx said:

Kinda interesting that lows (at least up this way) ended up colder than forecast, but winds were much less than forecast. I guess that's because of better radiational cooling and winds not mixing air around?

I think snow cover makes it easier for winds to decouple. When I first came to PHL one of the mets told me expect less wind than guidance once areas get snow covered.

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4 hours ago, Rainshadow said:

I would think like Shawn it could be a by-product of better radiational cooling.  I dont know how busy that road is, but car traffic by itself could also exacerbate the difference.  A standard adiabatic lapse rate between your house and the airport should have had about a 3F differential.  

which is typically what I see, however on route 1 in concordville (which has more traffic on it than 322 @ 6 AM and is slightly above 400') it was still 0F.  Not until I was down to probably under 100' did I notice the temp went up to 5F.  It didn't go from 0 to 5 I am sure I missed it rising but it was like a 5 mile difference that it went from 0 to 5F.  

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Magnitude of the cold (-10 / -23 split yesterday) at Chicago right there with the all timers, it won't match the duration of the 83 & 94 outbreaks

1983-12-22 19 -18 0.5 -25.4 64 0 T T 4
1983-12-23 -6 -21 -13.5 -39.2 78 0 T T 4
1983-12-24 -11 -25 -18.0 -43.5 83 0 0.00 0.0 4
1983-12-25 -5 -17 -11.0 -36.4 76 0 0.00 0.0 4
1983-12-26 11 -11 0.0 -25.2 65 0 0.00 0.0 4

 

1994-01-14 1 -10 -4.5 -28.0 69 0 0.00 0.0 2
1994-01-15 -4 -17 -10.5 -34.0 75 0 0.00 0.0 2
1994-01-16 10 -16 -3.0 -26.5 68 0 0.09 3.0 2
1994-01-17 10 -13 -1.5 -24.9 66 0 T T 5
1994-01-18 -11 -21 -16.0 -39.4 81 0 0.00 0.0 4
1994-01-19 3 -19 -8.0 -31.4 73 0 0.08 1.0 3
1994-01-20 15 -12 1.5 -21.9 63 0 T T 4
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