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Models Advertising Late Month Storm And Cold Front


bluewave

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The models are starting to converge on the idea of a cool start to October.

We'll have to wait and see the actual depth of the trough digging into the

East to determine how low the temperatures get. It looks like we will

see a rise in the PNA as was the case with the cool temperatures that

we experienced during September 16th-19th.

Euro ensemble mean

GFS ensemble mean

GFS 2m temperature departures

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Amen.

Yeah, ditto that. I can't take this wretched humidity anymore, and coupled with the constant cloudiness, mold has been sky high. In addition, cool temps Oct 1-7 will speed up foliage by the time I go to Vermont on the 8th. So far it's been a slow start to the color season.

Here's hoping for a chilly/+NAO October.

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Yeah, ditto that. I can't take this wretched humidity anymore, and coupled with the constant cloudiness, mold has been sky high. In addition, cool temps Oct 1-7 will speed up foliage by the time I go to Vermont on the 8th. So far it's been a slow start to the color season.

Here's hoping for a chilly/+NAO October.

I'm hoping to go to the Catskills on the 9th if I can drag ag3's ass to go with me.

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It does look like the coldest air of the season looks to be moving in late this week-early next week, with 850 mb Temps getting down below freezing on Sunday for everyone in the NYC area, per the 12z GFS.

gfs_namer_147_850_temp_mslp_precip.gif

With the 10m temperatures on Sunday, per the 12z GFS, they look to get into the upper 40s as highs in NW NJ, which would be very unusual, even for them. C NJ and NYC look to see highs into the mid 50s with the 12z GFS.

gfs_namer_165_10m_wnd_precip.gif

And with this cool shot, nighttime lows could dip into the 40s with NYC, and even the upper 30s in the Suburbs.

The 12z GFS is likely overdoing the cold, as it did with the last cool shot, but it is just another sign that summer has ended, and the pattern is gradually transitioning to a cooler pattern for fall.

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It does look like the coldest air of the season looks to be moving in late this week-early next week, with 850 mb Temps getting down below freezing on Sunday for everyone in the NYC area, per the 12z GFS.

gfs_namer_147_850_temp_mslp_precip.gif

With the 10m temperatures on Sunday, per the 12z GFS, they look to get into the upper 40s as highs in NW NJ, which would be very unusual, even for them. C NJ and NYC look to see highs into the mid 50s with the 12z GFS.

gfs_namer_165_10m_wnd_precip.gif

And with this cool shot, nighttime lows could dip into the 40s with NYC, and even the upper 30s in the Suburbs.

The 12z GFS is likely overdoing the cold, as it did with the last cool shot, but it is just another sign that summer has ended, and the pattern is gradually transitioning to a cooler pattern for fall.

I thought the last cool shot wasn't overdone; we had a high in the low 60s with lows around 50 for a couple days which was in line with the guidance. If anything our actual highs wound up colder than the forecast.

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I thought the last cool shot wasn't overdone; we had a high in the low 60s with lows around 50 for a couple days which was in line with the guidance. If anything our actual highs wound up colder than the forecast.

Agree. I tend to notice highs are slightly cooler than forecast behind cold fronts w/ strong high pressure in the autumn/winter. Spring into summer usually goes the opposite direction, with underdone fcst highs. In addition, the upgrade to the GFS last year has eliminated much of its prior cold bias.

I wouldn't be surprised to see frosts/freezes across much of suburbia next weekend; second year ninas tend to feature stronger cold shots in early-mid fall.

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Would have never thought after the cool down last week that we could end up +2 to +3 for the month. With a very mild week on tap that seems to be where we are headed. October starts cool but models are waffling as to whether it warms right back up or stays at least seasonal.

Agreed. Not enjoying this warm, humid weather. I'm ready for some cool, fresh air to come back so I can open up the house again.

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Looks a lot like last year at this time.

It will be interesting to see how the month turns out on average.

Last October started out cool and averaged above normal even

though we had a persistent trough over the Northeast in the means.

The warmth from the 24th-28th was enough to put us over the top.

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October 2010 averaged 58.1...That is 1.0 above the 1981-2010 average...It was average for the 1931-60 period...Below average for the 1941-70 period...1964 was probably the coldest first half of October in my lifetime...1988 was also very cold...

Dropped down to 17 F here on Halloween 1988. I always thought that was the October record low, but NOW data suggests the record low is 7 F on 10/22/1940. Could it be an error?

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Dropped down to 17 F here on Halloween 1988. I always thought that was the October record low, but NOW data suggests the record low is 7 F on 10/22/1940. Could it be an error?

it was 30 in NYC in October 1940...I remember it being in the low 20's a few mornings in the Poconos in October 1974...

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it was 30 in NYC in October 1940...I remember it being in the low 20's a few mornings in the Poconos in October 1974...

If it was 30 F in NYC, then I highly doubt it was 7 F out here. Maybe they meant 17, which would be more plausible.

1974: October 19th through the 25th were in the 20s here, four days at 20 F or 21 F.

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I thought the last cool shot wasn't overdone; we had a high in the low 60s with lows around 50 for a couple days which was in line with the guidance. If anything our actual highs wound up colder than the forecast.

The GFS for one predicted that C NJ would get into the Mid to Upper 30s, but we got into the lower 40s instead for the low temperatures.

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The GFS for one predicted that C NJ would get into the Mid to Upper 30s, but we got into the lower 40s instead for the low temperatures.

The true mark of a cold airmass is how chilly the daytime highs are. Don't let the less than ideal radiational cooling conditions that the models didnt pick up on right away trick you into thinking that it wasn't as impressive a cool shot as the models indicated.

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how can you not, lord knows we deserve it, its been cloudy and crappy rain for virtually the past two months. Its an extended summer, feel good time to be outside, nothing wrong twith that

Different strokes for different folks. Its been consistently warm from late May through now (with exception to the mid-month cool shot). Time for some real autumn weather.

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some of our snowiest winters had a warm October...

1947

1963

1968

1995

The warmest/coldest Octobers before a La Nina or near la nina winter are,

warmest...

year.....winter snowfall

1950......11.6"...

1954......11.5"

1961......18.1"

1971......22.9"

1973......23.5"

1984......24.1"

1995......75.6"

2007......11.9"

average 24.9"

Coldest.....

1964......24.5"

1974......13.1"

1988........8.1"

2008......27.6"

average 18.3"

A warmer October isn't the worst thing that can happen...there is a 50/50 chance we see a decent winter either way...

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some of our snowiest winters had a warm October...

1947

1963

1968

1995

The warmest/coldest Octobers before a La Nina or near la nina winter are,

warmest...

year.....winter snowfall

1950......11.6"...

1954......11.5"

1961......18.1"

1971......22.9"

1973......23.5"

1984......24.1"

1995......75.6"

2007......11.9"

average 24.9"

Coldest.....

1964......24.5"

1974......13.1"

1988........8.1"

2008......27.6"

average 18.3"

A warmer October isn't the worst thing that can happen...there is a 50/50 chance we see a decent winter either way...

It's interesting that after the warm Octobers before the snowy winters that you listed, high latitude blocking developed for November.

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some of our snowiest winters had a warm October...

1947

1963

1968

1995

The warmest/coldest Octobers before a La Nina or near la nina winter are,

warmest...

year.....winter snowfall

1950......11.6"...

1954......11.5"

1961......18.1"

1971......22.9"

1973......23.5"

1984......24.1"

1995......75.6"

2007......11.9"

average 24.9"

Coldest.....

1964......24.5"

1974......13.1"

1988........8.1"

2008......27.6"

average 18.3"

A warmer October isn't the worst thing that can happen...there is a 50/50 chance we see a decent winter either way...

I have never brought into the idea that a warm october = a warm winter.

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