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December 2019


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Just because the sensible weather averages out to the same over a 30 or 31 day period as another year doesnt mean anything beyond that. We have an incredible amount of data available to us, and as weather hobbyists we should be able to parse that data better than the average local news watcher.

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The last 4 days of December are averaging 46.7degs , or about 12degs. AN.

Month to date is  -0.3[37.8].       December should end near  +1.4[38.9].       For those waiting for January, the first 4 days there are already averaging 44degs.

All three major models are Snowless.        Only a few sub-freezing days are showing up over the next 10-16 days.

Cold air puts in two cameos 12/31-01/01 and 01/06-09.      It may change costumes, but be reading the same lines near mid-Jan.

46* here at 6am.        47* by 9am.       49* by Noon.       50* at 1pm.       52* at 2pm.       53* at 3pm (high)

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Does it really matter what the exact date is? All the models show a mild start to January. We now have a January thread for specific January discussion. We should put those posts in there since this is the December thread. People still want to discuss the end of December in here.

BC0DB920-E51A-4BCA-A03C-1CCEE7A4C308.thumb.png.100f91ac5c08c15b399e08ee84d6e8c7.png

95BE9BED-D5BD-4BF0-B870-44B16D5DA7A3.thumb.png.90b47db0712f965dc8e690775833c074.png

 

 

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3 minutes ago, Mersky said:

but you only posted a certain day showing warmth and NEVER mentioned that it gets colder after. Why is that??

You just joined yesterday and already you are derailing this thread. Specific temperature forecasts lose skill beyond beyond 5-7 days. So what is the point of posting raw day 10 temperature forecasts in the December thread. That’s what the January thread is for. Here is the raw model forecast that has been corrected for known biases. It doesn’t go out 10 days.

NEW YORK CITY-CENTRAL PARK
 KNYC   GFSX MOS GUIDANCE  12/28/2019  0000 UTC                       
 FHR  24| 36  48| 60  72| 84  96|108 120|132 144|156 168|180 192      
 SAT  28| SUN 29| MON 30| TUE 31| WED 01| THU 02| FRI 03| SAT 04 CLIMO
 X/N  53| 41  48| 41  52| 42  51| 36  47| 35  44| 40  46| 43  48 26 39

 

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3 minutes ago, Mersky said:

sir, you posted the january map in this thread, not me. 

Chill. It will be mild to start January.We know this. Quit saying there is an agenda. We have discussed the cold down extensively throughout this month for January. All of us know and most of us hope it will happen. However, it looks like a usual cold shot right now that last 3-5 days before relaxing. If you keep attacking quality posters, Especially Bluewave, you will find yourself ignored from many of us.

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Just now, Mersky said:

7 days take us into january correct???  how is posting something contrary to what you post causing trouble???  

You came in here yesterday and started posting laughing emojis after numerous posts. Are you a previous member signing up under a new name to cause trouble?

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Now back to December weather. 
 

The warm minimum temperatures  across the region yesterday put  an exclamation point on the late December warm up. Most of our stations are back close to normal now for the month. The unusually warm minimums extended from NYC up the Hudson to Albany. So both stations experienced the warmest minimum temperature of December on the 27th. Such late minimums have become more common this decade. It’s the 5 time that NYC has a warmest December minimum after the 20th. This is unusual since the average NYC minimum temperatures drop 9 degrees from the 1st to the 31st.

Warm minimums more impressive north of NYC

NYC....12-27....46...+17.2...month....-0.2

ALB.....12-27...40....+22.7...month....-0.2

NYC 2010’s December warmest minimum temperature dates

12-27-19....46

12-21-18....47

12-05-17....50

12-01-16....42

12-24-15....63

12-27-14.....44....T...25th...24th

12-22-13.....61

12-03-12.....49

12-06-11....56

12-12-19...40

 
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1 hour ago, bluewave said:

Now back to December weather. 
 

The warm minimum temperatures  across the region yesterday put  an exclamation point on the late December warm up. Most of our stations are back close to normal now for the month. The unusually warm minimums extended from NYC up the Hudson to Albany. So both stations experienced the warmest minimum temperature of December on the 27th. Such late minimums have become more common this decade. It’s the 5 time that NYC has a warmest December minimum after the 20th. This is unusual since the average NYC minimum temperatures drop 9 degrees from the 1st to the 31st.

Warm minimums more impressive north of NYC

NYC....12-27....46...+17.2...month....-0.2

ALB.....12-27...40....+22.7...month....-0.2

NYC 2010’s December warmest minimum temperature dates

12-27-19....46

12-21-18....47

12-05-17....50

12-01-16....42

12-24-15....63

12-27-14.....44....T...25th...24th

12-22-13.....61

12-03-12.....49

12-06-11....56

12-12-19...40

 
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2013 and 2015 with minimums in the 60's is really unbelievable...

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1 hour ago, gravitylover said:

These warm minimums are really starting to bug me 

The clouds and higher dewpoints allowed the minimum temperature departures to exceed the maximums across the Northeast. Matches the recent theme of it being so wet. We needed that brief dry pattern in September for those record mid 90’s on October 2nd.

 

B80E62C8-5E22-4B7A-A46D-D3662DA3DD1C.thumb.jpeg.62c2de702b391a587c0a31629890473b.jpeg

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Wow a negative 2.6 departure wiped out in 6 days. My call for  negative departures for December was way wrong and I made it on the 21st. No way I saw this warmth coming.  plus 9 the last 6 days and that looks to continue for the last four. This hobby can make you look bad at times and is very humbling. Anyway the first 3 weeks were very good and much better than the recent December's we had I am slightly below normal in snowfall so far. here is hoping to a better January. Kudos to those who had the warm call for December

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13 minutes ago, bluewave said:

The warm up was timed pretty well with the warm MJO 5-6 phases.

The theme of post 12/20 warm ups the last few years is remarkable, almost as if the MJO knew the time of year. 

Also, it seems in this day and age any monthly negative departure has to be really extreme and significant to stand up to eventual warmth that hits us almost every month, including the higher min temps as well.  The calls for an above normal December in the temp department were good calls.  However,  looking back at the last 10 years persistence forecasting would have been correct without ever considering the models, or fundamental meteorology. Thought for a brief moment winter was going to start early this year, but it was simply a head fake, part of the possible new trend of warm Octobers leading to colder Novembers and then the eventual  warm up after mid December.   

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The next 10 days, including today look +7, then we can get to a 6-day period of -3.

SD says that in a recent conversation with Judah Cohen, they decided  the culprit is the ionosphere when comes to the warmup.      It is just a delay to the cold coming  they felt.

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The problem with final monthly departures is they often dont tell the entire story. Some (not all obviously) who are attempting to take credit for hitting the final departures correctly while also making statements in late november/early december about the entire month being benign and warm are part of the reason for the disjointed and lazy discussion that sometimes invades otherwise sound meteorological discussion. 

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