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A short but sharp intrusion of cooler air is likely for tomorrow into Monday. Temperatures will top out in the middle 50s while lows outside New York City will generally fall into the 30s with lower 40s likely in Central Park. Afterward, it will warm up quickly early next week. The month could end with widespread temperatures well into the 70s.

Out West, yet another round of near-record and record heat is affecting Phoenix and Tucson. The heat will persist through tomorrow.

Through today, New York City has seen just a trace of rainfall for October. The old record low figure through October 26 was 0.02" in 1947. At Philadelphia, rainfall has also been a trace. The prior record was 0.05", which was set in 1947. Today is Philadelphia's 28th consecutive day with no measurable precipitation (tied for the 2nd longest dry stretch). The record streak of 29 days set during October 11-November 8, 1874 will very likely be tied tomorrow and broken on Monday.

Precipitation in the northern Mid-Atlantic region will likely remain below to much below normal through October. As a result, October monthly and all-time monthly record low precipitation amounts will likely be approached or broken in parts of the region.

Select October and Monthly Record Low Precipitation Amounts:

Allentown:
October: 0.15", 1963
Monthly: 0.09", May 1964
Period of Record: January 1912-Present

New York City:
October: 0.14", 1963
Monthly: 0.02", June 1949
Period of Record: January 1869-Present

Newark:
October: 0.21", 1963
Monthly: 0.07", June 1949
Period of Record: January 1893-Present

Philadelphia:
October: 0.09", 1924 and 1963
Monthly: 0.09:, October 1924 and October 1963
Period of Record: November 1871-Pesent

Trenton:
October: 0.05", 1963
Monthly: 0.05", October 1963
Period of Record: September 1865-Present

Wilmington, DE:
October: 0.05", 1924
Monthly: 0.05", October 1924
Period of Record: January 1894-Present

The NAO fell to a preliminary -2.751 on September 24th (all-time September record: -2.371, September 12, 1971). That was the 9th lowest value on record. La Niña winters following September cases where the NAO fell to -1.900 or below featured a predominantly positive NAO. The most recent such winters were 2016-2017 and 2022-2023. The mean temperatures for those winters in New York City were 39.3° and 41.0° respectively. The 1991-2020 normal value is 36.2°. A warmer outcome is favored by the October run of the C3S multi-model forecast for Winter 2024-2025.

The ENSO Region 1+2 anomaly was -0.1°C and the Region 3.4 anomaly was -0.3°C for the week centered around October 16. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -0.30°C and the ENSO Region 3.4 anomaly has averaged -0.33°C. Neutral ENSO conditions will likely evolve into a La Niña event during the late fall.

The SOI was +13.02 today.

The preliminary Arctic Oscillation (AO) was +2.135 today.

Based on sensitivity analysis applied to the latest guidance, there is an implied 99% probability that New York City will have a warmer than normal October (1991-2020 normal). October will likely finish with a mean temperature near 60.3° (2.4° above normal).

 

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48 / 33 off a low of 36.  Coolest day / evening and next morning of the next 10 likely.  Warming Tue - Fri, with upper 70s near / low 80s Wed and Thu.  Front comes through Thu evening and may drop a trace itll be a race to midnight or /when if any of the falls spoils a calendar of dry.   Overall dry continues with next east coast ridge building by the 2nd and into the 5th.  Trough beyond the 6th could bring the more meaningful rain unless things dry up between the 6 - 8th.

 

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54 minutes ago, bluewave said:


 

This should piss some people off.  Yes its the driest on record, how far do our records go back? People make it like time began 100 to 150 years ago.  Is this normal, no but im certain it has happened before. Do I want rain, yes.  Do I want a lot of snow in winter? HeLL Yes.

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5 minutes ago, wishcast_hater said:

This should piss some people off.  Yes its the driest on record, how far do our records go back? People make it like time began 100 to 150 years ago.  Is this normal, no but im certain it has happened before. Do I want rain, yes.  Do I want a lot of snow in winter? HeLL Yes.

How about when there is a storm and it is reported as a once in a 1000 year storm.

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23 minutes ago, wishcast_hater said:

This should piss some people off.  Yes its the driest on record, how far do our records go back? People make it like time began 100 to 150 years ago.  Is this normal, no but im certain it has happened before. Do I want rain, yes.  Do I want a lot of snow in winter? HeLL Yes.

I'm not sure what the problem is, I think the post aligns pretty well with your statement. One could say it's sensationalized a little bit but that's just twitter for ya

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3 hours ago, wishcast_hater said:

This should piss some people off.  Yes its the driest on record, how far do our records go back? People make it like time began 100 to 150 years ago.  Is this normal, no but im certain it has happened before. Do I want rain, yes.  Do I want a lot of snow in winter? HeLL Yes.

The continuous daily records in NYC go back to the late 1800s. A recent study based on tree rings found the driest period of the last 500 years was around the 1600s. And the recent 30 year period with the reliable instrument records was the wettest in the last 500 years. So my guess is during that drought around the 1600s there were probably months like this. Since a warmer atmosphere holds more moisture, the recent extreme rainfall events were to be expected and would have a much smaller chance of occurring in a much colder climate. As for temperatures, this recent period was the warmest since the end of the last ice age. But not nearly as warm as the prehistoric times when CO2  levels were actually higher than today. As we know CO2 can occur from natural sources like in the distant past. And we can cause the levels to change from emissions.

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5 hours ago, gravitylover said:

I finally have frost! This is the latest first frost I can remember here in the 28 years I've been here. It's weird though, all of the local stations stayed at or above 34°.

Funny how that happens, but it occurs fairly frequently (frost when the thermometer never dips below 32 F)

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3 hours ago, the_other_guy said:

still fantasy land

With how things have been going since late August, would anyone actually be surprised if this modeled “rain event” for early November verifies as nothing more than some showers?

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