December Discobs 2024

[Terpeast]

Currently 22.6. Forecast low is 13.

[T. August]

19.4° at 8:30. Forecast is 12°. I suppose it’s possible but I have a suspicion that it levels out around 14/15 for the low.

[astarck]

2 hours ago, Rhino16 said:

At the NWR station they are at 4° already. Down from 17° at 4:40pm.

And now below 0°.

[WEATHER53]

32.5 for a high

31. 5pm

28.5 7pm

27 at 8:30

 

[WEATHER53]

13 hours ago, MN Transplant said:

Mesoscale models have a light band of precip coming through in the morning.  Surface is residually cold, but the column is a little too warm.  So, more of a mix.  If it is delayed at all the surface will warm and it'll just be cold rain on the 24th.

Something seems up.

[rjvanals]

Tuesday morning could be a disaster on the roads if the NAMs are correct 

[RIC_WX]

7/4 at DCL.  Crystal clear skies and calm winds.  Feels like we have a little further to fall.
 

Lake is just primed to ice over, too bad it’s warming up after tonight.

[wxdude64]

19.7/10.0 at 9:30 pm. A toasty 73.5 degrees upstairs and an extra toasty 86.3 degrees downstairs. The woodstove chugging along. 

[aldie 22]

17 already 

[NorthArlington101]

Short-range stuff back to having a FRZA/-SN band come through during the Tuesday morning commute. Could be mostly impactful if people are out-and-about on Christmas Eve. It'll stick.

.SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/...
The low associated with the upper trough will be moving into the
eastern Great Lakes by Tuesday morning. Isentropic lift in a
moisture channel being drawn into this system may produce some
very light precipitation late Monday night into Tuesday morning.
Given the antecedent airmass, most areas should drop below
freezing Monday night even with slight warm advection aloft and
increasing clouds. Given the weak forcing, coverage of
precipitation remain somewhat uncertain, with the highest
chances along the Alleghenies and across northern Maryland east
of Catoctin Mountain. Potential onset timing also ranges before
and after sunrise. On top of this, there will be precipitation
type challenges since the warm advection aloft could push the
temperature profile above freezing. Even though QPF may only be
several hundredths of an inch, any amount of wintry
precipitation could pose a travel challenge given the cold
ground conditions. 

[pazzo83]

DCA high of 36F - first sub 40 high of the season.  Mid-upper 20s right now.  Teens do not seem likely downtown, but probably up here.

[JenkinsJinkies]

Warmest high in the 7 day forecast for me is 50, and that's a week from now.

[nj2va]

24/10. Brrrr

[SnowtoRain]

16.7/8.6

[WVclimo]

13° now, on the way to a forecast low of 10.

[Terpeast]

19.4 now. 

[wxmeddler]

Tiny bit of a shortwave at 500 moving through with some elevated moisture levels and clouds. Might put a pause on our cooling for a 3-4 hours. Still, longest night of the year. Someone is gonna get single digits east of the Blue Ridge.

[midatlanticweather]

I was down to 17.7 degrees about an hour ago.. now up to 19.1 degrees

 

[midatlanticweather]

And just like that, dropped to 17.2 degrees!

 

[high risk]

16 hours ago, MN Transplant said:

Mesoscale models have a light band of precip coming through in the morning.  Surface is residually cold, but the column is a little too warm.  So, more of a mix.  If it is delayed at all the surface will warm and it'll just be cold rain on the 24th.

        The signal is even stronger in this evening's runs.   Almost every CAM has some light precip early Tuesday, and temperatures are just below freezing, except for the HiRes Window FV3 which is known to poorly handle low-level inversions.   Given that temperatures will be very cold leading into this event, I would expect surfaces to be very cold, and icing would be a problem even for areas right around 31 or 32.    Certainly worth additional tracking.

[Stormchaserchuck1]

13F

[pazzo83]

1 hour ago, nj2va said:

24/10. Brrrr

21/10 here near the tree line in upper NW.

[JakkelWx]

some of the radiative spots in the central delmarva by marydel are around 10 degrees. drove to the state line as an experiment and the car showed 11F.

[Miss Pixee]

22 crisp degrees in SE DC. No wind, everything quiet.

[aldie 22]

12 when woke up 

[North Balti Zen]

5 hours ago, high risk said:

        The signal is even stronger in this evening's runs.   Almost every CAM has some light precip early Tuesday, and temperatures are just below freezing, except for the HiRes Window FV3 which is known to poorly handle low-level inversions.   Given that temperatures will be very cold leading into this event, I would expect surfaces to be very cold, and icing would be a problem even for areas right around 31 or 32.    Certainly worth additional tracking.

Advisories are up. 

[CAPE]

Low of 11

[yoda]

1 hour ago, North Balti Zen said:

Advisories are up. 

URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
300 AM EST Mon Dec 23 2024

DCZ001-MDZ004>006-008-011-013-014-503>508-VAZ053-054-501-505-506-526-
527-231900-
/O.NEW.KLWX.WW.Y.0023.241224T1000Z-241224T1800Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Cecil-Southern Baltimore-Prince Georges-Anne Arundel-Northwest
Montgomery-Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Fairfax-Arlington/Falls Church/Alexandria-Northern Fauquier-
Western Loudoun-Eastern Loudoun-Northwest Prince William-Central
and Southeast Prince William/Manassas/Manassas Park-
300 AM EST Mon Dec 23 2024

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 1 PM EST TUESDAY...

* WHAT...Freezing rain expected. Total ice accumulation of a light
  glaze to a few hundredths of an inch. A dusting to one tenth of an
  inch of snow is possible.

* WHERE...Portions of DC, central, north central, northeast, and
  northern Maryland, and northern Virginia.

* WHEN...From 5 AM to 1 PM EST Tuesday.

* IMPACTS...Roads, and especially bridges and overpasses, will
  likely become slick and hazardous. Plan on slippery road
  conditions. The hazardous conditions could impact the Tuesday
  morning commute.

* ADDITIONAL DETAILS...Precipitation begins as light freezing rain
  early Tuesday morning along and west of US-15, then begins along
  the Interstate 95 corridor around or just before sunrise. Some
  snow could mix in at times, though that is most likely along and
  north of Interstate 70. Precipitation transitions to a mix of rain
  and freezing rain late Tuesday morning, before coming to an end
  early Tuesday afternoon.

[yoda]

URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
300 AM EST Mon Dec 23 2024

MDZ001-501-WVZ501-503-505-231900-
/O.NEW.KLWX.WW.Y.0023.241224T0900Z-241225T0000Z/
Garrett-Extreme Western Allegany-Western Grant-Western Mineral-
Western Pendleton-
300 AM EST Mon Dec 23 2024

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 7 PM EST TUESDAY...

* WHAT...Mixed precipitation expected. Total snow accumulations up
  to half an inch and ice accumulations up to one tenth of an inch.

* WHERE...In Maryland, Extreme Western Allegany and Garrett
  Counties. In West Virginia, Western Grant, Western Mineral, and
  Western Pendleton Counties.

* WHEN...From 4 AM to 7 PM EST Tuesday.

* IMPACTS...Roads, and especially bridges and overpasses, will
  likely become slick and hazardous. Plan on slippery road
  conditions. The hazardous conditions could impact the Tuesday
  morning and evening commutes.

* ADDITIONAL DETAILS...Precipitation begins as a mix of light snow
  and freezing rain early Tuesday morning, then transitions to a
  light freezing rain by late Tuesday morning. A light freezing
  drizzle could continue through early Tuesday evening.

 

[yoda]

URGENT - WINTER WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
300 AM EST Mon Dec 23 2024

MDZ003-VAZ028-030-031-WVZ051>053-231900-
/O.NEW.KLWX.WW.Y.0023.241224T1000Z-241224T1500Z/
Washington-Frederick VA-Warren-Clarke-Morgan-Berkeley-Jefferson-
300 AM EST Mon Dec 23 2024

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 10 AM EST
TUESDAY...

* WHAT...Freezing rain expected. Total ice accumulations of a light
  glaze to a few hundredth of an inch.

* WHERE...Portions of north central Maryland, northwest Virginia,
  and panhandle West Virginia.

* WHEN...From 5 AM to 10 AM EST Tuesday.

* IMPACTS...Roads, and especially bridges and overpasses, will
  likely become slick and hazardous. Very slippery sidewalks, roads
  and bridges are possible. The hazardous conditions could impact
  the Tuesday morning commute.

* ADDITIONAL DETAILS...Precipitation begins as light freezing rain
  early Tuesday morning. Some light snow could mix in at times.
  Precipitation comes to an by late Tuesday morning.