bluewave

It’s a variation on the same theme. Last December 2nd had the low track just south of Long Island also. But there was more cold available to start last December than this year near the coast. It’s interesting that we are seeing a similar track almost a year to the day.

Thanks. Updated for November 2020. 11....2020...EWR....4...NYC...1....LGA....1...JFK...4...BDR...5....ISP....4

Even the EPS drops the cold into Montana in about 8-10 days. But the GEPS and GEFS dig a little more into the Rockies. Montana and surrounding areas have really been the focus of what little cold departures there have been in recent years.

First 60° temperature on record today in Caribou during meteorological winter.

These differences in handling the short term storm details really magnifies the ensemble spread by day 10. That’s why I want to see how each individual storm verifies before looking past day 8-10. The EPS, GEFS, and GEPS all have varying solutions day 8-10.

The 12z Euro finally ejects enough energy from the SW for a more phased coastal rain and wind event on the 5th. 12z today 12z yesterday

Updated for November 2020. 11....2020...EWR....4...NYC...1....LGA....1...JFK...4...BDR...5....ISP....4

I was pointing out back in the October and early November threads how the atmosphere wasn’t showing the canonical La Niña patterns. We have been experiencing these more Niño-like +AAM spikes since the fall. So I mentioned that we may not follow a typical La Niña November. This is much like the last few years with mismatched Niño and Niño-like influences at the same time. This is due to all the competing record equatorial and off equatorial SST warmth from the Indian Ocean into the Pacific.

Those long range strat forecasts for change are very uncertain given how strong the PV has been.

The OP GFS longer range has had less of a cold bias than the ensembles over SE Canada. Sometimes, the lower resolution ensembles smooth out the ridge near the near the Northeast too much. Where the OP runs don’t.

It only took NYC 5 years to beat 2015 for warmest November. It took 14 years for 2015 to surpass 2001. And 2001 over 20 years to go ahead of 1979. Time Series Summary for NY CITY CENTRAL PARK, NY - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2020 53.0 0 2 2015 52.8 0 3 2001 52.7 0 4 1979 52.5 0 5 1948 52.4 0 6 1975 52.3 0 7 2011 51.9 0 - 2006 51.9 0 - 1994 51.9 0 - 1931 51.9 0 8 1902 51.4 0 9 2009 51.1 0 10 1999 50.8 0

The Euro is really struggling with the split flow. Notice how much different the GFS and CMC are at day 10. Remember, the errors at day 7-10 often build into the day 11-15.

People will probably replant smaller ornamentals that have less chance of damaging their homes in our more extreme climate.

Longer range, we need to watch for the ridge east of New England verifying stronger than forecast. This has been the pattern for a while now. Today is just the most recent case. 7 day Forecast Verification

Numerous 60 mph + gusts across the area. Fairfield County... Stamford 63 MPH 0131 PM 11/30 CWOP New London County... Groton Airport 61 MPH 0256 PM 11/30 ASOS Jackson Heights 61 MPH 0122 PM 11/30 CWOP Kew Garden Hills 60 MPH 0115 PM 11/30 NYSM Orient 66 MPH 0216 PM 11/30 CWOP Stony Brook 64 MPH 0208 PM 11/30 CWOP Southold 61 MPH 0245 PM 11/30 NYSM West Gilgo Beach 61 MPH 0132 PM 11/30 CWOP Farmingdale Airport 60 MPH 0153 PM 11/30 ASOS

The 7-8th will depend on the evolution of the storm threat for the 5th. If the storm on the 5th is more amped, then the 7-8th could get suppressed like the CMC shows. Have to see which model gets the evolution on the 5th correct. The Euro may be struggling with hanging too much energy back to the SW again on the 4-5th.

Plenty of spread between the model guidance at 12z. UKMET and CMC are west while GFS and Euro east. Euro may be struggling with holding back too much energy to the SW again.

Toughest decadal stretch for tree damage continues.

Just gusted to 54 mph on the South Shore with the heavy downpour. http://www.nysmesonet.org/mesonow#network=nysm&stid=want From SE at 33 mph Gusting to 54 mph

Strongest winds of the day so far along the South Shore gusting to 46 mph in Wantagh. http://www.nysmesonet.org/mesonow#network=nysm&stid=want

Convection developing to our south now.

Gusting to 63 mph just north of ACY.

NYC tied for warmest November with a day to go. Time Series Summary for NY CITY CENTRAL PARK, NY - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2020 52.8 1 - 2015 52.8 0 2 2001 52.7 0 3 1979 52.5 0 4 1948 52.4 0 5 1975 52.3 0 Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2015 52.0 0 - 1994 52.0 0 3 2001 51.9 0 1979 51.7 0 - 1975 51.7 0 4 2020 51.4 1 5 2006 51.3 0 Time Series Summary for LAGUARDIA AIRPORT, NY - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2020 54.2 1 2 2001 53.5 0 3 2006 53.4 0 4 2015 53.3 0 5 1975 52.6 0 Time Series Summary for ISLIP-LI MACARTHUR AP, NY - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2015 49.9 0 2 2011 49.8 0 3 2006 49.7 0 4 2020 49.3 1 - 1994 49.3 0 - 1975 49.3 0

It has been an ongoing issue for the GEFS. I can’t wait until machine learning brings us bias corrected model guidance maps. Maybe someday we can look at day 11-15 bias corrected maps which will take long range forecasting to the next level. But that will probably require quite a bit more computer power.