November Discobs 2023

[WVclimo]

16°.  Coldest morning so far.

Edit: low fell to 14

[BlizzardNole]

13 hours ago, Terpeast said:

Btw did anyone see flurries in central MD or near the blue ridge in VA? 

I saw clouds with heavy virga that appeared to reach the ground to the N and W of me (Ashburn)

We had a nice snow shower at 10:20 am yesterday near Germantown.  For a few seconds it was moderate snow

[WxUSAF]

Low of 22

[MN Transplant]

20.7.  That is good for the 3rd coldest day of calendar 2023 and colder than any day in January 2023.

DCA 25, IAD 20 

[North Balti Zen]

17

[weatherCCB]

Low of 20

[H2O]

1 hour ago, H2O said:

22.0. Coldest temp this fallen 

Edit: 19.6

[CAPE]

low of 21

[vastateofmind]

Got down to 17, currently on rebound.  

[SnowtoRain]

21.7

[Roger Ramjet]

15

[GramaxRefugee]

22 low

eta:  the tidal South River was shockingly frozen about 1/3, I estimate. I expected only some skim ice on the periphery. 

[wxdude64]

Bottomed out at 13.3 here around 3:30 am, has crept up a bit since. Currently 14.6/8.7 with mostly clear skies. Least wind has calmed from yesterday!!

[Kay]

Low of  22

[George BM]

IAD got down to 19F this morning.

[Its a Breeze]

Hit 17, nice

[aldie 22]

cold this morning....feels like a brisk early March morning

[katabatic]

Bottomed out at 8.2; currently 12.2 with a spectacular sunrise over the ridges. 

[mappy]

low of 19

[EastCoast NPZ]

18F

multiple rounds of snow flurries yesterday between about 9AM and noon.

[Terpeast]

Low of 19.8

[hstorm]

21.6 for the low in Great Falls. 
 

Yesterday’s final numbers were 38.7/25.9. Not bad for late November. 

[Eskimo Joe]

DCA got down to 25 degrees. Nice.

[WxUSAF]

11 minutes ago, Eskimo Joe said:

DCA got down to 25 degrees. Nice.

I don’t know if there’s any literature about it, but I started dabbling with a project in grad school that would have shown that UHI is minimized during cold air advection as opposed to basic radiational cooling. Never got very far with it, but I think last night is a good demonstration of that idea.

[Eskimo Joe]

3 minutes ago, WxUSAF said:

I don’t know if there’s any literature about it, but I started dabbling with a project in grad school that would have shown that UHI is minimized during cold air advection as opposed to basic radiational cooling. Never got very far with it, but I think last night is a good demonstration of that idea.

Yup. We're two weeks behind the average first freeze date of 11/14. 

[WesternFringe]

14 for low NW of Staunton. Brrrr...

[MN Transplant]

41 minutes ago, WxUSAF said:

I don’t know if there’s any literature about it, but I started dabbling with a project in grad school that would have shown that UHI is minimized during cold air advection as opposed to basic radiational cooling. Never got very far with it, but I think last night is a good demonstration of that idea.

I think that is almost a given.  A stable boundary layer is going to be much more susceptible to emitted long wave radiation from all of the “stored” urban heat.  

[WxUSAF]

14 minutes ago, MN Transplant said:

I think that is almost a given.  A stable boundary layer is going to be much more susceptible to emitted long wave radiation from all of the “stored” urban heat.  

Yeah, but at the time I couldn’t find any literature measuring that. Maybe it’s been done since.

[flsch22]

Fort Belvoir low of 15.  Surprised how low that station gets being close to river and often colder than IAD.  Open field/lack of surrounding concrete perhaps?

[cbmclean]

53 minutes ago, MN Transplant said:

I think that is almost a given.  A stable boundary layer is going to be much more susceptible to emitted long wave radiation from all of the “stored” urban heat.  

I wouldn't think the LR radiation would be the culprit.  It would go through the dry air with little heating, whether the air is moving or not.  I would think the factor of moving air would be its ability to carry away the heat being transferred by convection.  Sort of like wind-chill for the earth