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Even we have gone below freezing twice, last night got down to -0.8c, and the previous night got down to -1.3c. Our first frost is late November on average, so it's normal.
For New York City Central Park, the latest fall freeze recorded was December 22nd in 1998. Jeez, if it's going to be that late might as well hold off till after Christmas. But first freeze in December isn't unheard of — 2001, 2006, 2009, 2010, 2011 had the first freeze in December. Though most in early December. Getting out of the heat island, in Islip 50 miles east, the latest freeze date recorded was November 15, median date October 27. A few degrees must make a big difference: there must have been lots of near freezing nights in those Novembers where NYC missed a freeze.
My point is that why has the urban heat island of NYC not protected it from 32F? Our urban heat island hasn't changed for years, yet this year is very late for us. It is the pattern making it late, not the UHI. Those other areas are usually earlier than us, so that is nothing new. But we usually hit 32 around Nov 11th, not in December. And this year it looks like it will be December. That is incredible for us.
On Weather Underground places in the row house hoods of Philly only went to 36F last night.
The NW flow across a good portion of the eastern US coast has been very minimal this fall. I blame the positive NAO. I remember one time this past month when the subtropical jet curved as far north as southern New England. Hopefully that BS is over.
Quote:
Originally Posted by AJ1013
Glad I'm leaving tonight. (The low last night was a pathetic 68F where I live because winds switched to the NE here while remaining NW at the airport until sunrise)
Nogales on the US/Mexico border? Do you work for US customs or something?
My point is that why has the urban heat island of NYC not protected it from 32F? Our urban heat island hasn't changed for years, yet this year is very late for us
NYC Central Park recorded its first freeze this morning. Ditto with JFK Airport. Must have a local geography quirk why NYC got a freeze this year but Philadelphia missed it.
Check out what the snowpack is doing still. 2pm temps.
Mason City, IA hasn't passed 36° last 5 days. While Minneapolis hit mid 40s last 2 days and Des Moines up to 52 today. Mason City had a low of 2° & 8° with a fresh snowpack.
Looks like the snow is eroding faster now as was expected. Rain coming Thursday there. Nasty wet muddy and Slushy Thanksgiving for them.
There's a 62°F not that far from the snowpack. I wonder if the temperature contrast has made it windy. Is it enough to show up in 850 hPa temperatures? 925 hPa temperatures? Could be a good way to see how much surface can affect atmosphere. If the airmasses are stationary, I'd guess small effect. Otherwise, not really.
Ah. I made my assumption earlier because Miami is a port of entry for a lot of goods coming into the US from the Caribbean/South America whereas Nogales gets a lot of stuff (both legal and illegal) coming in from Mexico.
For New York City Central Park, the latest fall freeze recorded was December 22nd in 1998. Jeez, if it's going to be that late might as well hold off till after Christmas. But first freeze in December isn't unheard of — 2001, 2006, 2009, 2010, 2011 had the first freeze in December. Though most in early December. Getting out of the heat island, in Islip 50 miles east, the latest freeze date recorded was November 15, median date October 27. A few degrees must make a big difference: there must have been lots of near freezing nights in those Novembers where NYC missed a freeze.
A couple of degrees make all the difference. If you look at the stats, NYC's average first night below 40F is around October 20th, whereas the first freeze is around November 25th. So, a difference of 7F translates to more than a month in terms of average first dates.
A few dozen miles also makes all the difference. NYC's first freeze is around Nov 25th; for ISP it's around Nov 1st; and for FOK it's around Oct 10th (if I'm not mistaken).
Glad to see NYC and JFK were on time this year.
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But first freeze in December isn't unheard of — 2001, 2006, 2009, 2010, 2011 had the first freeze in December. Though most in early December. Getting out of the heat island, in Islip 50 miles east, the latest freeze date recorded was November 15, median date October 27. A few degrees must make a big difference: there must have been lots of near freezing nights in those Novembers where NYC missed a freeze.
