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April 2018 Discussions & Observations Thread


Rtd208

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1 hour ago, NewYorkweatherfan said:

Uncle when was the latest freeze for NYC 

May 6th.

Historically the average last day is April 3rd. If today is the last day it's pretty close to the historical average.

Of course outside the UHI of NY the days are much later in the season. I've seen frost in early June and I'm only geographically 45 miles NNW of NYC.

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1 minute ago, CPcantmeasuresnow said:

May 6th.

Historically the average last day is April 3rd. If today is the last day it's pretty close to the historical average.

Of course outside the UHI of NY the days are much later in the season. I've seen frost in early June and I'm only geographically 45 NNW of NYC.

May 6th? Wow that's late I wonder what year that happened and if it was a cold and snowy winter?

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31 minutes ago, SnoSki14 said:

For those complaining about the cold, looks like a strong spring-like period is now likely later this week.

Though it wouldn't take much for a more a backdoor pattern to return, and I think the warming could be exaggerated.

It's not going to last

Right back to cool and wet after next week.

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NYC's first and last freeze dates...

season....first.freeze....last.freeze..
1876-77.......10/15.......4/08
1877-78.......11/07.......3/26
1878-79.......11/05.......4/06
1879-80.......10/25.......4/12

1880-81.......11/18.......4/07
1881-82.......11/22.......4/12
1882-83.......11/03.......4/03
1883-84.......11/12.......4/06
1884-85.......11/19.......4/14
1885-86.......11/01.......4/04
1886-87.......11/07.......4/19
1887-88.......10/30.......4/25
1888-89.......11/17.......3/31
1889-90.......10/24.......4/19

1890-91.......11/21.......5/06
1891-92.......11/04.......4/25
1892-93.......11/11.......3/30
1893-94.......11/15.......4/09
1894-95.......11/07.......4/05
1895-96.......11/12.......4/08
1896-97.......11/23.......4/20
1897-98.......11/18.......4/07
1898-99.......11/24.......4/06
1899-00.......11/12.......4/11

1900-01.......11/15.......3/31
1901-02.......11/10.......3/20
1902-03.......12/05.......4/05
1903-04.......11/07.......4/20
1904-05.......10/31.......3/15
1905-06.......11/14.......4/01
1906-07.......11/29.......4/03
1907-08.......12/03.......4/05
1908-09.......11/04.......4/11
1909-10.......11/30.......3/18

1910-11.......11/20.......4/03
1911-12.......11/03.......4/04
1912-13.......11/03.......3/28
1913-14.......11/11.......4/13
1914-15.......11/10.......4/04
1915-16.......11/18.......4/09
1916-17.......11/15.......4/10
1917-18.......10/31.......4/12
1918-19.......11/24.......4/26
1919-20.......11/14.......4/11

1920-21.......11/12.......4/11
1921-22.......11/06.......4/21
1922-23.......11/21.......4/14
1923-24.......11/09.......4/03
1924-25.......11/16.......4/21
1925-26.......10/29.......4/20
1926-27.......11/04.......3/28
1927-28.......11/07.......4/16
1928-29.......10/30.......3/18
1929-30.......11/22.......4/24

1930-31.......11/05.......3/14
1931-32.......11/07.......4/13
1932-33.......11/20.......3/25
1933-34.......10/26.......3/29
1934-35.......11/14.......4/16
1935-36.......11/23.......4/08
1936-37.......10/26.......3/31
1937-38.......11/21.......4/07
1938-39.......11/24.......4/13
1939-40.......11/13.......4/15

1940-41.......10/19.......3/31
1941-42.......11/25.......2/28
1942-43.......11/13.......4/16
1943-44.......11/15.......4/06
1944-45.......11/23.......3/11
1945-46.......11/21.......3/12
1946-47.......11/23.......3/31
1947-48.......11/19.......4/04
1948-49.......12/11.......3/20
1949-50.......11/22.......4/14

1950-51.......11/16.......3/27
1951-52.......11/03.......3/17
1952-53.......11/29.......3/11
1953-54.......11/06.......4/04
1954-55.......11/10.......3/29
1955-56.......11/19.......3/28
1956-57.......11/10.......3/25
1957-58.......11/11.......4/09
1958-59.......11/28.......3/29
1959-60.......11/17.......3/27

1960-61.......11/07.......3/21
1961-62.......11/10.......3/09
1962-63.......11/07.......3/23
1963-64.......12/01.......4/05
1964-65.......11/21.......4/01
1965-66.......10/29.......3/29
1966-67.......11/04.......4/12
1967-68.......11/08.......4/06
1968-69.......11/21.......4/01
1969-70.......10/23.......4/11

1970-71.......11/23.......3/27
1971-72.......11/08.......4/09
1972-73.......10/20.......3/21
1973-74.......11/10.......4/10
1974-75.......10/19.......4/10
1975-76.......10/31.......4/12
1976-77.......10/27.......4/10
1977-78.......11/14.......4/03
1978-79.......11/25.......4/08
1979-80.......11/30.......4/17

1980-81.......11/16.......3/21
1981-82.......11/25.......4/08
1982-83.......11/13.......3/30
1983-84.......11/13.......3/18
1984-85.......11/19.......4/10
1985-86.......12/02.......3/22
1986-87.......11/13.......4/01
1987-88.......11/11.......3/23
1988-89.......10/31.......3/22
1989-90.......11/18.......3/28

1990-91.......11/09.......4/13
1991-92.......11/26.......4/13
1992-93.......11/08.......3/20
1993-94.......11/21.......3/19
1994-95.......11/23.......4/06
1995-96.......11/09.......3/29
1996-97.......11/12.......4/10
1997-98.......11/13.......3/23
1998-99.......12/22.......3/16
1999-00.......11/30.......4/09

2000-01.......11/20.......3/28
2001-02.......12/16.......4/07
2002-03.......11/27.......4/08
2003-04.......11/09.......4/06
2004-05.......11/09.......3/16
2005-06.......11/18.......3/22
2006-07.......12/04.......4/09
2007-08.......11/11.......3/30
2008-09.......11/18.......3/24
2009-10.......12/07.......3/27

2010-11.......12/04.......3/29
2011-12.......12/10.......3/27
2012-13.......11/06.......3/23

2013-14.......11/12.......4/16

2014-15.......11/18.......4/01

2015-16.......11/24.......4/06

2016-17.......12/09.......3/23

2017-18.......11/10.......4/08 as of 4/8

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4 hours ago, bluewave said:

EPS has been shifting stronger recently with the SE ridge on Friday. Could be the best shot at first  spring 70's in the warmer spots. Looks like maybe a day or 2 of spring-like conditions before getting cooler again.

New run

ecmwf-ens_z500a_us_7.thumb.png.cae5e677cea3b0ff6d5e2b4a60b4e47c.png

Old run

ecmwf-ens_z500a_us_9.thumb.png.8611da041bbfee28313807157a95af63.png

 

Looks as if GFS is going to score a victory here? It has been consistently showing a major late week warmup. The last few days forecasts have been getting cooler for late week, showing highs only in the upper 50s as the Euro and other models went cooler. If the 70s are suddenly looking likely again, then perhaps GFS was right all along. I remember a few days ago the GFS was showing 70s for next saturday while the GGEM was showing snow, lol.

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39 minutes ago, winterwx21 said:

Looks as if GFS is going to score a victory here? It has been consistently showing a major late week warmup. The last few days forecasts have been getting cooler for late week, showing highs only in the upper 50s as the Euro and other models went cooler. If the 70s are suddenly looking likely again, then perhaps GFS was right all along. I remember a few days ago the GFS was showing 70s for next saturday while the GGEM was showing snow, lol.

The GFS and Euro have both been going back and forth between runs the last several days. When both models see a warm up coming, it usually verifies. A few days of spring will be nice. It could actually go in as the high temperature for the month. For some reason, the April monthly highs during the 2000's have mostly been mid month before turning cooler late.14 out of the last 18 Aprils in NYC had the high temperature for the month between the 7th and 20th. 

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April 1976 went from 25 one morning to 90 in the afternoon three days later...then back to 40's and 30's for the end of the month...1962 had a topsy turvey late April and early May...it went from a max of 91 in late April to a max of 45 in early May...it actually got three days with a max in the 40's the first week of May...Then it hit 99 on the 19th...

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1 hour ago, uncle W said:

today was NYC's 68th day with a minimum 32 or lower...since the 1978-79 season the average amount of 32 or lower days is 69...the range was 93 in 2013-14 to 37 in 2011-12...

Amazing that we caught back up after the warmest February on record. This is a lot harder than the snowfall. 

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I don't think the warmth will last, the blocky pattern keeps recycling but just how you can sneak in some cold days in an overall warm pattern, you same rings true for the opposite.

I just hope the models don't revert to that backdoor look they had a few days ago. However as of now the first true spring weekend could be upon us. 

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36 minutes ago, SnoSki14 said:

I don't think the warmth will last, the blocky pattern keeps recycling but just how you can sneak in some cold days in an overall warm pattern, you same rings true for the opposite.

I just hope the models don't revert to that backdoor look they had a few days ago. However as of now the first true spring weekend could be upon us. 

It makes sense that the warmth will try to win out for at least a few days. It has been a rarity in the 2010's to go as long as we have without a +10 or greater day. Our last +10 or higher departure  was way back on March 1st.

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1 hour ago, NewYorkweatherfan said:

Monday night into Tuesday morning looks interesting for a dusting around by Tuesday morning. Who’s making a thread

NWS has a chance of snow/mix here with a low of 37F on Monday night into Tuesday morning. Should transition to rain early though as temps are expected to make a run at 50F.

NYC at 34/16...may get another freeze tonight.

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Next 8 days jump to an average of 54degs., or 3degs. AN.  Right now>>>32.0 here.

Rossby Wave Train is mostly AN from April 12-26.  Then BN to mid-May, finally AN by the Memorial Week Holidays.  Subtely the M,J,J period  has moved from BN to neutral, during the last few days of runs.

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For the second consecutive morning, New York City had a temperature at 32°. The last time New York City had at least two consecutive freezing days in April was April 4-6, 2016 when the low temperatures were 29°, 26°, and 30°.

Overnight into tomorrow morning, a weak system could bring a period of rain and/or snow to the region. New York City’s northern and western suburbs could pick up a slushy coating to an inch. No accumulation is likely in the City.

A big rebound in temperatures appears likely after mid-week. The Thursday-Sunday period will likely see readings in the 60s and 70s. Some of the warmest areas could make a run at 80°, especially on Friday or Saturday.

New York City’s Average Temperature Through:

4/8 43.7° (5.4° below normal)
4/10 43.0°-43.6° (4/8 estimate: 42.7°-43.9°)
April 15: 47.1°-49.5° (4/8 estimate: 46.4°-49.2°)

Per aggressive sensitivity analysis, the estimated probability of an below normal monthly anomaly: 55% (4/8 estimate: 54%)

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The people patiently waiting for spring will get a few days later this week into the weekend. Both the GFS and Euro have 80 degree potential  for the warm spots around the region. Following the brief warm up, a back door drops south with a rainy pattern for a few days. Temps transition cooler again, but not as quite cold as we are seeing the last few days. This could be the last freeze of the season for NYC.

ecmwf_t2max_12_nyc_25.thumb.png.517b72230c8d69f67864928467f0ac96.png

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18 hours ago, uncle W said:

today was NYC's 68th day with a minimum 32 or lower...since the 1978-79 season the average amount of 32 or lower days is 69...the range was 93 in 2013-14 to 37 in 2011-12...

Should finish right on average at 69 days...Central Park reached a low of 32F as of 3:51am...32/14 right now, nice and crisp for April 9th.

Will probably be the last freeze barring clearer than expected weather tonight, or an unseasonably late cold airmass. NYC hasn't had regular freezes in late April since the late 1800s.

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