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February 2021


snowman19
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Morning thoughts...

Today will be mostly cloudy. Additional snow showers and periods of light snow with possible light accumulations are likely across parts of the region. Parts of northeastern Pennsylvania into southern New York State could pick up several inches of snow. Temperatures will likely reach the mainly the middle 30s across much of the region. Likely high temperatures include:

New York City (Central Park): 35°
Newark: 37°
Philadelphia: 36°

Clouds could break in parts of the region tomorrow. In the extended range, the EPS ensemble members are clustered around February 7-8 for possible measurable snow.

30-Day Verification: Period ended January 31

New York City (Central Park):
Average daily forecast: 39.8°
Average temperature: 39.5°
Average error: 1.3°

Newark:
Average daily forecast: 41.3°
Average temperature: 41.0°
Average error: 1.5°

Philadelphia:
Average daily forecast: 42.2°
Average temperature: 41.8°
Average error: 1.4°

 

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This could be our first La Niña winter in 30 years when NYC finishes with a cold departure in February and it’s the snowiest month. Even the 1995-1996 winter couldn’t pull off this feat. While it had a cold departure in February, the snowiest winter month was January. Just goes to show how competing influences during the last 3 winters overrode ENSO climatology.

NYC La Ninas last 30 years 

Temperature departures

Snowfall

Season.....Dec....Jan....Feb

20-21......+1.7....+2.2.....?

................10.5.....2.1.....14.8...so far

17-18......-2.5......-0.9......+6.7

................7.7......11.2......4.9

16-17......+0.8....+5.4.....+6.3

................3.2.......7.9......9.4

11-12......+5.8....+4.7.....+5.6

.................0.0.....4.3........0.2

10-11......-4.7.....-2.9......+0.7

...............20.1.....36.0.....4.8

08-09......+0.6.....-4.7.....+1.4

.................6.0......9.0......4.3

07-08.......+4.9.....+3.9....+0.5

.................2.9........T.........9.0

05-06.......-2.2.......+8.3.....+0.4

..................9.7.......2.0......26.9

00-01......-6.4......+1.0....+0.6

................13.4......8.3......9.5

99-00......+2.4......-1.3.....+3.5

..................T.........9.5.......5.2

98-99.......+5.6.....+1.3.....+3.5

.................2.0........1.5.......4.7

95-96.......-5.1......-2.1.......-1.5

.................11.5......26.1......21.2

 

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We’ll have multiple shots as the block retrogrades and then a HECS opportunity once the block diminishes for Archambault event feb 10-17. The retrograded block forces low heights out over 50/50 region with potential split flow underneath -epo. This month could be epic if things break right

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this was the 15th wettest 10" snowfall on record for Central Park NYC...

4.43"...17.5"...02/04-07/1920...mid 20's to low 30's...snow/ice/sleet for over 72 hours...

3.17"...20.9"...02/25-26/2010...mid 30's to upper 20's...wet snow some mix...

3.11"...14.5"...03/01-02/1914...upper 30's to upper teens...started as rain/sleet/ice...

2.68"...12.5"...02/20/1921........mid 30's to low 20's...started as rain/sleet/ice...

2.62"...17.4"...02/03-04/1961...upper 20's to low 30's...changed to sleet/rain for a time...

2.52"...10.6"...03/13-14/1993...low 30's to upper 30's...changed to sleet and rain...

2.40"...26.4"...12/26-27/1947...mid 20's to low 30's...all snow

2.32"...27.5"...01/22-23/2016...mid 20's...all snow

2.22"...10.4"...02/03-04/1926...mid 20's to 30...mixed with sleet and ice...

2.16"...20.2"...01/07-08/1996...low teens to low 20's...all snow...

2.10"...21.0"...03/12-14/1888...upper 30's to single digits...started as rain/sleet...

2.08"...18.1"...03/07-08/1941...low 20's to low 30's...wet snow ending as a mix...

2.08"...12.5"...02/13-14/2014...mid 20's to mid 30's to mid 20's...changed to rain for 12 hours...

2.06"...19.0"...01/26-27/2011...low 30's to mid 30's to upper 20's...changed to rain for a time...

1.94"...11.5"...01/02/1925........low and mid 20's...mixed with sleet/ice...

1.94"...17.2"...01/31-2/2/2021 mid 20's to low 30's...mixed with sleet at times...

1.87"...12.0"...03/15-16/1896...upper 20's to low 30's...ended as mix and rain...

1.86"...26.9"...02/11-12/2006...upper 20's...all snow...

1.82"...15.3"...02/09-10/1969...mid 30's to mid 20's...

1.78"...19.8"...02/16-17/2003...single digits to mid 20's...

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5 hours ago, bluewave said:

This could be our first La Niña winter in 30 years when NYC finishes with a cold departure in February and it’s the snowiest month. Even the 1995-1996 winter couldn’t pull off this feat. While it had a cold departure in February, the snowiest winter month was January. Just goes to show how competing influences during the last 3 winters overrode ENSO climatology.

NYC La Ninas last 30 years 

Temperature departures

Snowfall

Season.....Dec....Jan....Feb

20-21......+1.7....+2.2.....?

................10.5.....2.1.....14.8...so far

17-18......-2.5......-0.9......+6.7

................7.7......11.2......4.9

16-17......+0.8....+5.4.....+6.3

................3.2.......7.9......9.4

11-12......+5.8....+4.7.....+5.6

.................0.0.....4.3........0.2

10-11......-4.7.....-2.9......+0.7

...............20.1.....36.0.....4.8

08-09......+0.6.....-4.7.....+1.4

.................6.0......9.0......4.3

07-08.......+4.9.....+3.9....+0.5

.................2.9........T.........9.0

05-06.......-2.2.......+8.3.....+0.4

..................9.7.......2.0......26.9

00-01......-6.4......+1.0....+0.6

................13.4......8.3......9.5

99-00......+2.4......-1.3.....+3.5

..................T.........9.5.......5.2

98-99.......+5.6.....+1.3.....+3.5

.................2.0........1.5.......4.7

95-96.......-5.1......-2.1.......-1.5

.................11.5......26.1......21.2

 

the 1970's had three winters in four  years that were la nina with Feb being the coldest snowiest month...1971-72...1973-74...1974-75...

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38 minutes ago, uncle W said:

the 1970's had three winters in four  years that were la nina with Feb being the coldest snowiest month...1971-72...1973-74...1974-75...

Yeah, that was in the era of much colder Februaries. When we get cold these days in February, it really stands out. The coldest recent February was 2015 with the weak El Niño. Our only February below 0° was during the Super El Niño in 2016. Those 1970s La Niñas were during our long 10”+  snowstorm drought from 1970 to 1977. This winter we already have 2. 
 

NYC February average temperature 

1970-1980....32.4°

2010-2020....36.0°

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Following the January 1996 blizzard, New York Times columnist Russell Baker wrote in the January 9, 1996 edition of that newspaper:

"Where are the snows of yesteryear?" asked the poet. We can now tell him. The weekend blizzard, like the snows of yesteryear, not only was wonderfully copious but also, like those storms of childhood, brought adventure for almost everybody.

Baker continued, "Thomas Mann in 'The Magic Mountain' observed that time slows down when one escapes the normal order and that life becomes more interesting and, because time has slowed, longer."

Just over 25 years later, those sentiments ring true again. A large part of northeastern Pennsylvania, northern New Jersey, southeastern New York, including New York City, and southwestern Connecticut are covered by a thick mantle of snow. Although the joy that this most recent snowstorm brought to those who are open to nature's beauty might not prolong one's lifespan, it surely will make life just a little more rewarding.

After the snow-starved winter of 2019-20, the region has already witnessed two big snowstorms. If the 0z and 12z runs of the European Model are reasonably accurate, perhaps there will be another such storm in the near-term. While such an outcome is not yet certain, it is among the possibilities that lie ahead.

Somewhat milder air will return to the region in coming days, but its stay won't be long. Another shot of cold air is possible during or after the weekend. Moreover, EPS ensemble members are increasingly clustering around February 7-8 for another possible snow event.

The ENSO Region 1+2 anomaly was -0.4°C and the Region 3.4 anomaly was -0.7°C for the week centered around January 27. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.71°C and the ENSO Region 3.4 anomaly has averaged -1.03°C. La Niña conditions will likely prevail at least through meteorological winter.

The SOI was +9.17 today.

Today, the preliminary Arctic Oscillation (AO) figure was not available.

On February 1 the MJO was in Phase 6 at an amplitude of 2.070 (RMM). The January 31-adjusted amplitude was 2.174.

Based on the latest guidance, no significant stratospheric warming event is likely through the middle of the second week of February.  

The significant December 16-17 snowstorm during what has been a blocky December suggests that seasonal snowfall prospects have increased especially from north of Philadelphia into southern New England. At New York City, there is a high probability based on historic cases that an additional 20" or more snow will accumulate after December. Since January 1, New York City has picked up 17.3" snow.

 

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10 hours ago, bluewave said:

Yeah, that was in the era of much colder Februaries. When we get cold these days in February, it really stands out. The coldest recent February was 2015 with the weak El Niño. Our only February below 0° was during the Super El Niño in 2016. Those 1970s La Niñas were during our long 10”+  snowstorm drought from 1970 to 1977. This winter we already have 2. 
 

NYC February average temperature 

1970-1980....32.4°

2010-2020....36.0°

we're also in a much wetter climate now

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The next 8 days are averaging 29degs.(24/34)., or -4.0.

No snow for the next 5 days.        Nothing major showing yet after that time either.     The storm that  just passed was 2.0"+14.8"+0.4" = 17.2".        My area in CI was no where near this much.      Barometer still in the 29.40"---29.47" for over a day I think.      Still at  the latter now.

EURO is 10 degrees colder than the other models.         Say repeated single digit lows to the teens on the CMC and GFS.

30*(75%RH) here at 6am.      32* by 9am.     35* by 10am.         36* by Noon.       37* by 3pm.       Briefly was 38*.         35* by 7pm.

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