bluewave

3-21-18 was my last 10” event. It was also my 2nd favorite late season snowstorm behind 4-6-82. https://www.weather.gov/okx/storm03212018

The duration of multiyear below normal snowfall regimes can be uncertain. But it usually takes a 10.0”+ event to get the ball rolling back in the right direction. Great pattern breaking snowstorms like 1-20-78, 3-13-93, and 12-30-00 come to mind.

The 53.1° average November temperature in NYC is normal for South Carolina. Monthly Climate Normals (1981-2010) - GRNVL SPART INTL AP, SC November 52.4

NYC currently in the lead for the warmest January through November on record. This is the 5th top 10 warmest January through November since 2010. Time Series Summary for NY CITY CENTRAL PARK, NY Click column heading to sort ascending, click again to sort descending. Rank Ending Date Mean Avg Temperature Jan 1 to Nov 30 Missing Count 1 2020-11-30 59.1 4 2 2016-11-30 59.0 0 - 2010-11-30 59.0 0 3 1991-11-30 58.9 0 4 2012-11-30 58.8 0 5 1990-11-30 58.7 0 6 1953-11-30 58.6 0 - 1949-11-30 58.6 0 7 1998-11-30 58.5 0 8 2017-11-30 58.4 0 - 2002-11-30 58.4 0 9 2006-11-30 58.1 0 - 1999-11-30 58.1 0 10 1983-11-30 58.0 0

Very warm end to November should allow NYC to finish near the top of the warmest Novembers list. KNYC GFSX MOS GUIDANCE 11/27/2020 0000 UTC FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192 FRI 27| SAT 28| SUN 29| MON 30| TUE 01| WED 02| THU 03| FRI 04 CLIMO X/N 60| 46 58| 42 57| 48 60| 50 54| 36 45| 38 47| 39 46 34 47 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 4 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

Looks like LGA tied the record high of 67°. This is a normal Thanksgiving for Charleston, SC. So another example of the subtropical climate zone shifting north. https://www.wrh.noaa.gov/mesowest/getobext.php?sid=KLGA&table=1&num=168&banner=off Almanac for LAGUARDIA AIRPORT, NY November 26, 2020 Daily Data Observed Normal Record Highest Record Lowest Max Temperature 67 51 67 in 1946 34 in 1974 Almanac for Charleston Area, SC (ThreadEx) November 26, 2020 Daily Data Observed Normal Record Highest Record Lowest Max Temperature M 67 82 in 1973 41 in 1938

65° at Newark. Getting close to the record high of 68° set back in 2011. Newark Liberty PTSUNNY 65 59 81 SW16 29.95F Almanac for NEWARK LIBERTY INTL AP, NJ November 26, 2020 Daily Data Observed Normal Record Highest Record Lowest Max Temperature M 51 68 in 2011 29 in 1938

This month the very strong IO MJO combined with a near record polar vortex for November record warmth. So it really enhanced the upper ridge over the area. The closest MJO composite match for November was a phase 3. You can see the dominant VP anomalies focused near that part of the IO.

We are on track for a top 5 warmest Thanksgiving across the area. Parts of LI are already in the low 60s at 7am. Shirley LGT RAIN 61 55 81 S9 https://www.weather.gov/media/okx/Climate/CentralPark/Top5Thanksgiving.pdf NYC #1....69° #2....66° #3....65° #4....64° #5....62°

This may be the first time that NYC had 8 consecutive warmer than average falls. Time Series Summary for NY CITY CENTRAL PARK, NY Click column heading to sort ascending, click again to sort descending. Year Mean Avg Temperature Departure 2020 59.8 +2.3 2019 58.1 +0.6 2018 57.6 +0.1 2017 60.4 +2.9 2016 60.1 +2.6 2015 61.8 +3.3 2014 58.2 +0.7 2013 57.8 +0.3 2012 56.9 -0.6

Discuss...

12z Euro would be a continuation of our unusually active late fall convection pattern. Has an impressive low topped squall to start December with early morning temps in the 60s.

NYC holding in 1st place for warmest November by a narrow margin with several more 60° days possible. KNYC GFSX MOS GUIDANCE 11/24/2020 0000 UTC FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192 TUE 24| WED 25| THU 26| FRI 27| SAT 28| SUN 29| MON 30| TUE 01 CLIMO X/N 49| 40 56| 49 62| 51 61| 51 62| 43 49| 45 56| 42 45 35 48 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 53.2 7 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

Do you think the Euro is showing its bias in holding too much energy back to the SW? Its12z depiction of a SE coastal low looks much different than the 12z GFS,CMC, and UKMET. The GFS, UKMET, and CMC have a warmer storm track closer to our area.

This may be a new late November record for lightning east of New England.

Mild week coming up with the potential for our first Thanksgiving 60° since 2015. https://www.weather.gov/media/okx/Climate/CentralPark/Thanksgivingwx.pdf KNYC GFSX MOS GUIDANCE 11/23/2020 0000 UTC FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192 MON 23| TUE 24| WED 25| THU 26| FRI 27| SAT 28| SUN 29| MON 30 CLIMO X/N 56| 38 49| 39 55| 50 61| 52 60| 51 61| 46 54| 44 51 35 48

Our unusually active late convection season continues this morning. BULLETIN - IMMEDIATE BROADCAST REQUESTED Special Marine Warning National Weather Service New York NY 645 AM EST Mon Nov 23 2020 The National Weather Service in Upton NY has issued a * Special Marine Warning for... Moriches Inlet to Montauk Point NY out 40 NM... Long Island Sound East of New Haven CT / Port Jefferson NY... Peconic and Gardiners Bays... * Until 730 AM EST. * At 644 AM EST, strong thunderstorms were located along a line extending from New London Harbor to 14 nm southwest of Buoy 44017, moving northeast at 45 knots. HAZARD...Wind gusts 34 knots or greater and small hail. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... Watch Hill, Gardiners Island, Orient Point, Fishers Island Sound, Buoy 44017, Shelter Island Sound, Gardiners Bay, The Race, New London Harbor and Shelter Island.

NYC could see only the 5th 60° Thanksgiving since 1999. KNYC GFSX MOS GUIDANCE 11/22/2020 0000 UTC FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192 SUN 22| MON 23| TUE 24| WED 25| THU 26| FRI 27| SAT 28| SUN 29 CLIMO X/N 54| 50 55| 38 49| 36 52| 51 64| 50 58| 52 57| 49 54 35 48 https://www.weather.gov/media/okx/Climate/CentralPark/Thanksgivingwx.pdf 11-26-15...60° 11-22-07...66° 11-25-04...65° 11-25-99...61° https://www.weather.gov/media/okx/Climate/CentralPark/Top5Thanksgiving.pdf

It looks like the CONUS is on track for a top 5 warmest November. Numerous stations are in 1st place with just under 10 days to go. Pretty uniform warmth across the country. 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 53.3 9 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 Time Series Summary for Chicago Area, IL (ThreadEx) - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2020 50.2 9 2 1931 50.0 0 3 1909 48.5 0 4 2001 48.2 0 5 1913 47.2 0 Time Series Summary for Goodland Area, KS (ThreadEx) - Month of Nov Click column heading to sort ascending, click again to sort descending. Rank Year Mean Avg Temperature Missing Count 1 2020 48.9 9 2 1999 46.4 0 3 1914 46.0 0 4 1949 45.7 0 5 2016 45.5 0

Remarkably consistent storm track since 2018 with 3 of the wettest years on record for higher elevations to our SW. Time Series Summary for HIGHLANDS, NC - Jan through Dec Click column heading to sort ascending, click again to sort descending. Rank Year Total Precipitation Missing Count 1 2020 125.89 42 2 2018 125.46 0 3 1979 115.92 37 4 2019 111.78 0

NYC on track for a top 10 warmest November. Models have generally above normal temperatures for the remainder of the month. Today looks like the 2nd day in a row to reach 60°. KNYC GFSX MOS GUIDANCE 11/21/2020 0000 UTC FHR 24| 36 48| 60 72| 84 96|108 120|132 144|156 168|180 192 SAT 21| SUN 22| MON 23| TUE 24| WED 25| THU 26| FRI 27| SAT 28 CLIMO X/N 60| 42 53| 48 55| 36 48| 40 55| 48 58| 43 54| 44 54 36 49 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 53.2 10 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

Yeah, similar to Elko, Nevada in late September. Almanac for Elko Area, NV (ThreadEx) September 27, 2020 Daily Data Observed Normal Record Highest Record Lowest Max Temperature 72 74 91 in 2010 43 in 1923 Min Temperature 34 35 51 in 1989 13 in 1889 Avg Temperature 53.0 54.2 67.5 in 1989 38.0 in 1999

Thanks for reminding me to run the 6 hr temperature rise numbers. That’s when we had a diurnal range similar to the high desert in Nevada during September. It tied the 6 hr biggest November temperature jump. There was a 44° low between hours with a total jump of 32°. But the data plotter below only works with the hourly temperatures.

Near record 30 hr November temperature jump coming for Friday. Places that were in the low 20s this morning will be near 60° Friday afternoon. So a 35 to 40° temperature rise. KISP GFSX MOS GUIDANCE 11/19/2020 1200 UTC FHR 24 36| 48 60| 72 84| 96 108|120 132|144 156|168 180|192 FRI 20| SAT 21| SUN 22| MON 23| TUE 24| WED 25| THU 26|FRI CLIMO N/X 39 59| 45 61| 39 54| 50 58| 34 46| 35 58| 47 57| 41 34 50 https://mesonet.agron.iastate.edu/plotting/auto/?_wait=no&q=169&network=NY_ASOS&zstation=ISP&hours=30&month=nov&dir=warm&dpi=100&_fmt=png