bluewave

I believe this is the first time that the May monthly minimum temperature in NYC was colder than April. Monthly Lowest Min Temperature for NY CITY CENTRAL PARK, NY Click column heading to sort ascending, click again to sort descending. Year Apr May Season 2020 36 34 36 2019 33 42 33 2018 32 48 32 2017 37 44 37 2016 26 43 26 2015 32 48 32 2014 31 49 31 2013 33 42 33 2012 38 49 38 2011 35 46 35 2010 40 41 40

Maybe a blend of snow, graupel, and rain as the atmosphere destabilizes later.

White Plains beat their latest last freeze by 6 days. Frost/Freeze Summary for WESTCHESTER CO AP, NY Each section contains date and year of occurrence, value on that date. Click column heading to sort ascending, click again to sort descending. Year Last Value First Value Season Length 1966 05-03 (1966) 32 10-31 (1966) 27 180 2008 05-01 (2008) 32 10-20 (2008) 32 171 2019 04-29 (2019) 32 11-02 (2019) 32 186 2002 04-27 (2002) 31 10-24 (2002) 29 179 1956 04-25 (1956) 27 11-10 (1956) 21 198

3rd lowest temperature on record in NYC for the month of May. JFK and HPN tied their May minimums. Time Series Summary for NY CITY CENTRAL PARK, NY - Month of May Click column heading to sort ascending, click again to sort descending. Rank Year Lowest Min Temperature Missing Count 1 1891 32 0 2 1874 33 0 3 2020 34 0 Time Series Summary for JFK INTERNATIONAL AIRPORT, NY - Month of May Click column heading to sort ascending, click again to sort descending. Rank Year Lowest Min Temperature Missing Count 1 2020 34 0 2 1966 34 0 Time Series Summary for WESTCHESTER CO AP, NY - Month of May Click column heading to sort ascending, click again to sort descending. Rank Year Lowest Min Temperature Missing Count 1 2020 32 0 - 2008 32 0 3 1966 32 0

Another mild and snowless winter with a record fall or spring snow event. RECORD EVENT REPORT NATIONAL WEATHER SERVICE NEW YORK NY 220 PM EDT FRI OCT 29 2011 ...RECORD OCTOBER SNOWFALL AMOUNT SET FOR CENTRAL PARK NY... AS OF 2 PM TODAY...CENTRAL PARK RECORDED 1.3 INCHES OF SNOWFALL. SINCE SNOWFALL RECORDS BEGAN IN 1869...AN INCH OF SNOWFALL HAS NEVER BEEN RECORDED IN THE MONTH OF OCTOBER. THE LAST TWO TIMES THAT MEASURABLE SNOW FELL IN THE MONTH OF OCTOBER WAS...OCTOBER 21 1952 WITH 0.5 INCHES AND OCTOBER 30 1925 WITH 0.8 INCHES. THEREFORE...THIS BREAKS THE DAILY RECORD FOR SNOWFALL IN OCTOBER AND THE MOST SNOWFALL EVER RECORDED IN THE MONTH OF OCTOBER.

NYC has EWR tie the latest last snow.

The only thing that I can remember about the 76-77 winter was how cold it was. I don’t have a personal memory of the record late trace of snow around the area in May. Maybe we can spot a few wet flakes tomorrow when the record UL and cold pool moves through. This was the report from Bridgeport on the 21st. 186 SXUS71 KOKX 212055 RERBDR RECORD EVENT REPORT NATIONAL WEATHER SERVICE NEW YORK NY 455 PM EDT TUE APR 21 2020 ...RECORD DAILY MAXIMUM SNOWFALL SET AT BRIDGEPORT CT... A RECORD SNOWFALL OF A TRACE WAS SET AT BRIDGEPORT CT TODAY. THIS WAS DUE TO HAIL ASSOCIATED WITH THUNDERSTORMS THAT MOVED THROUGH. $$

I had a few snowflakes during the morning of the 23rd also. It was the small hail with the thunderstorms on 21st that went in as a trace of snow.

We saw something like this during the 15-16 winter. December went +13 and then NYC dropped below zero in February for the first time since 1994. Extreme blocking seems to be the common denominator.

Models have temperatures very close to record lows early Saturday. EWR...33 NYC....35 LGA....37 JFK....38 ISP......36 BDR....37

It was a severe thunderstorm outbreak with hail and tornado in the region. https://www.ncdc.noaa.gov/stormevents/listevents.jsp?eventType=ALL&beginDate_mm=05&beginDate_dd=29&beginDate_yyyy=1995&endDate_mm=05&endDate_dd=29&endDate_yyyy=1995&county=ALL&hailfilter=0.00&tornfilter=0&windfilter=000&sort=DT&submitbutton=Search&statefips=36%2CNEW+YORK COLUMBIA CO. NY 05/29/1995 17:40 EST Tornado F2 0 5 10.000M 0.00K West Hurley ULSTER CO. NY 05/29/1995 18:30 EST Hail 0.75 in. 0 0 0.00K 0.00K Lake Katrine ULSTER CO. NY 05/29/1995 18:30 EST Hail 1.00 in. 0 0 0.00K 0.00K Salt Point DUTCHESS CO. NY 05/29/1995 19:55 EST Hail 1.25 in. 0 0 0.00K 0.00K Poughkeepsie DUTCHESS CO. NY 05/29/1995 20:15 EST Hail 1.00 in. 0 0 0.00K 0.00K North Clove DUTCHESS CO. NY 05/29/1995 20:30 EST Hail 0.75 in. 0 0 0.00K 0.00K Oceanside NASSAU CO. NY 05/29/1995 21:55 EST Thunderstorm Wind 0 kts. 0 0 0.00K 0.00K Merrick NASSAU CO. NY 05/29/1995 21:56 EST Hail 1.00 in. 0 0 0.00K 0.00K Smithtown SUFFOLK CO. NY 05/29/1995 22:15 EST Thunderstorm Wind 0 kts. 0 0 0.00K 0.00K Totals: 0 5 10.710M 0.00K

The record warmth took a break that May. It was the 5th latest 41 or lower reading on record in NYC. The temperatures rebounded again in July after a close to average June. First/Last Summary for NY CITY CENTRAL PARK, NY Each section contains date and year of occurrence, value on that date. Click column heading to sort ascending, click again to sort descending. Year Last Value First Value Difference 1961 05-27 (1961) 41 10-28 (1961) 40 153 1925 05-25 (1925) 41 10-10 (1925) 36 137 1963 05-24 (1963) 39 09-24 (1963) 40 122 1907 05-21 (1907) 40 10-19 (1907) 39 150 2002 05-19 (2002) 41 10-15 (2002) 41 148 1976 05-19 (1976) 38 10-18 (1976) 38 151

This is ridiculous for May.

Today was the 8th -10 departure in NYC since April 17th. There were only 2 days with a -10 departure in NYC for all of December through March. TEMPERATURE (F) TODAY MAXIMUM 52 1113 AM 92 1986 68 -16 74 1949 MINIMUM 48 253 PM 32 1891 51 -3 51 AVERAGE 50 60 -10 63

I believe that 5-22-02 was the latest freeze for the coldest spots on Long Island. Frost/Freeze Summary for WESTHAMPTON GABRESKI AP, NY Each section contains date and year of occurrence, value on that date. Click column heading to sort ascending, click again to sort descending. Year Last Value First Value Season Length 2002 05-22 (2002) 32 10-15 (2002) 31 145 2016 05-20 (2016) 32 10-11 (2016) 31 143 2008 05-20 (2008) 31 10-07 (2008) 31 139 2003 05-19 (2003) 32 10-03 (2003) 29 136 2000 05-16 (2000) 30 10-09 (2000) 32 145 2013 05-15 (2013) 32 10-19 (2013) 32 156 1999 05-15 (1999) 31 10-06 (1999) 31 143

This may be a new surface to 500 mb steep lapse rate record for our area on Saturday.

Euro has some the lowest May 850 mb temperatures on record for Saturday. So it looks like NYC has a good chance to dip below 40 for the first time in May since the 1970’s. NYC may not get out of the 40’s for a high on Saturday. There also could be some wet snowflakes mixed in during the morning. That would tie 1977 for the latest trace of snow on record in NYC. The NYC record low is 35 and low max 44. Record Lowest Max Temperature M 69 94 in 1979 44 in 1977 Min Temperature M 52 74 in 2000 35 in 1947

18z NAM with a rare late season interior snow. Maybe some flakes to the coast behind the storm. Models really struggling with the TPV storm details.

Models continuing with record low May 500 mb heights this weekend. The Euro has a -5 SD event with the TPV. So maybe we can see some flurries if the precipitation coincides with the lowest temperatures in the morning. Would be a tie with 1977 for the latest trace of snow at the coast.

Euro hinting at possibly the lowest 500mb heights on record for May next weekend. The TPV drops into the Northeast with a -4 to -5 SD departure. TPV related storm details can be difficult beyond 120 hrs. But portions of the Northeast can see late season snow along with impressive May cold for most.

Euro continuing with the late freeze idea for next weekend N and W of NYC. Be interesting to see if NYC can actually drop below 40 degrees. Sometimes the OP Euro is too cool for NYC beyond 5 days out. But with the TPV dipping into New England, maybe NYC can pull off 37 to 39 degrees. Frost/Freeze Summary for SUSSEX AIRPORT, NJ Each section contains date and year of occurrence, value on that date. Click column heading to sort ascending, click again to sort descending. Year Last Value First Value Season Length Minimum 04-17 (2016) 10-05 (2019) 151 Mean 04-30 10-16 167 Maximum 05-14 (2013) 10-28 (2011) 188 2019 04-29 (2019) 28 10-05 (2019) 30 158 2018 05-01 (2018) 32 10-18 (2018) 31 169 2017 05-04 (2017) 32 10-17 (2017) 30 165 2016 04-17 (2016) 31 - - - 2015 04-26 (2015) 28 10-17 (2015) 27 173 2014 04-25 (2014) 30 10-20 (2014) 32 177 2013 05-14 (2013) 29 10-21 (2013) 32 159 2012 04-30 (2012) 27 10-12 (2012) 29 164 2011 04-22 (2011) 26 10-28 (2011) 32 188 2010 05-11 (2010) 28 10-10 (2010) 30 151

Newark made it to 80 with the warm downslope flow. Newark Liberty PTSUNNY 80 52 37 W15G22

We get our transient warm up this weekend. But one of the coldest 6-10 forecasts we see this time of year. The blocking pattern right across the pole is as strong as it gets for May.

Looks like mid to upper 70’s today. Probably the warmest day for the first half of the month. While it will feel warm, temperatures will be much cooler than the record heat two years ago. RECORD EVENT REPORT NATIONAL WEATHER SERVICE NEW YORK NY 440 PM EDT THU MAY 03 2018 ...RECORD HIGH TEMPERATURE SET AT NEWARK NJ... A RECORD HIGH TEMPERATURE OF 94 DEGREES WAS SET AT NEWARK NJ TODAY. THIS BREAKS THE OLD RECORD OF 91 SET IN 2001.