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July 2019 General Discussions & Observations Thread


bluewave
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11 minutes ago, Radders said:

I have been looking at DP forecasts over the last week or so and have noticed that the GFS in general seems to go less aggressive vs. the Euro.  Is this a known GFS or Euro bias?

 

A blend is a safe bet. JFK probably will hit 79, ISP 78, LGA 75, NYC 74

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Just now, psv88 said:

A blend is a safe bet. JFK probably will hit 79, ISP 78, LGA 75, NYC 74

may depend on the amount of heavy rain w/ barry's remnants tomorrow night. this could temper max temps in the 90s (instead of 100+) but would also increase the potential for 80+ DPs.

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12 minutes ago, Stormlover74 said:

The nam brings in the heavy convection tomorrow night while Thursday is largely dry now

the main energy passes through tomorrow night into first thing thursday morning, but there is a lingering weakness thru the day thursday prior to the ridge building in late thursday night. low level jet forcing and the nocturnal flare-up of these tropical remnants probably will make tomorrow night the most likely period for widespread showers and storms. sea breeze storms are probable thursday afternoon unless the NAM's backdoor front is legit. most guidance keeps that just to the n and ne.

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1 minute ago, purduewx80 said:

the main energy passes through tomorrow night into first thing thursday morning, but there is a lingering weakness thru the day thursday prior to the ridge building in late thursday night. low level jet forcing and the nocturnal flare-up of these tropical remnants probably will make tomorrow night the most likely period for widespread showers and storms. sea breeze storms are probable thursday afternoon unless the NAM's backdoor front is legit. most guidance keeps that just to the n and ne.

the 12z run jumped north with that front

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36 minutes ago, purduewx80 said:

the main energy passes through tomorrow night into first thing thursday morning, but there is a lingering weakness thru the day thursday prior to the ridge building in late thursday night. low level jet forcing and the nocturnal flare-up of these tropical remnants probably will make tomorrow night the most likely period for widespread showers and storms. sea breeze storms are probable thursday afternoon unless the NAM's backdoor front is legit. most guidance keeps that just to the n and ne.

Been thinking Barry's remnants  comes in quicker,  as most often happens and its more Wed PM start than Wed night.  Perhaps enough clearing Thu to get temps in the mid 90s but would not shock me if clouds and storms linger most of Thu too.  I do think temps on Wed to be under forecast as we likely cloud over early AM or even overnight tonight with plenty of storms and rain by the afternoon.  

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6 minutes ago, SACRUS said:

Been thinking Barry's remnants  comes in quicker,  as most often happens and its more Wed PM start than Wed night.  Perhaps enough clearing Thu to get temps in the mid 90s but would not shock me if clouds and storms linger most of Thu too.  I do think temps on Wed to be under forecast as we likely cloud over early AM or even overnight tonight with plenty of storms and rain by the afternoon.  

we'll see. like today, there should be scattered air mass storms ahead of the circulation during the afternoon, including in the NYC area.

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Just now, Gravity Wave said:

12z GFS remains less bullish with DPs. At 18z Saturday the metro is right at 100 but the 66-68 degree dewpoint keeps the heat index around 105 rather than 110+.

Yeah, I don't think I've ever seen 100 degree heat with 80 degree DP in this area. 

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57 minutes ago, TriPol said:

Yeah, I don't think I've ever seen 100 degree heat with 80 degree DP in this area. 

July 15th,1995 was the only time that I could find.

Newark

https://www.wunderground.com/history/daily/us/nj/newark/KEWR/date/1995-7-15

2:00 PM 103  F 72  F 37 % WNW 13 mph 23 mph 29.8 in 0.0 in
1:00 PM 103  F 73  F 38 % WNW 14 mph 26 mph 29.8 in 0.0 in
2:00 PM 103  F 78  F 45 % WNW 17 mph 0 mph 29.8 in 0.0 in
3:00 PM 99  F 84  F 62 % W 16 mph 0 mph 29.8 in 0.0 in
4:00 PM 98  F 84  F 64 % WNW 14 mph 0 mph 29.8 in 0.0 in
5:00 PM 95  F 82  F 66 % WNW 10 mph 0 mph 29.8 in 0.0 in
6:00 PM 94  F 80  F 64 % WNW 14 mph 0 mph 29.8 in 0.0 in
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2 hours ago, Radders said:

I have been looking at DP forecasts over the last week or so and have noticed that the GFS in general seems to go less aggressive vs. the Euro.  Is this a known GFS or Euro bias?

 

The short range NAM under 36-48 and Euro under 72 seem to do best. But they have been too low on extreme dew point days. Their short range forecasts only had about a 75-76 dewpoint forecast a few weeks ago when JFK hit 79.

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1 hour ago, Gravity Wave said:

12z GFS remains less bullish with DPs. At 18z Saturday the metro is right at 100 but the 66-68 degree dewpoint keeps the heat index around 105 rather than 110+.

No surprise to see it backing off.   anything over 77-78 is very rare here.

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NYC's hottest mean temperatures...

7/22/2011.....104/84...94.0...

8/07/1918.....104/83...93.5

7/15/1995.....102/84...93.0

8/09/2001.....103/82...92.5

7/06/2010.....103/81...92.0...

7/21/1980.....102/82...92.0

7/06/1999.....101/83...92.0

7/09/1936.....106/77...91.5

7/04/1999.....101/82...91.5

7/23/2011.....100/83...91.5

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Just now, uncle W said:

NYC's hottest mean temperatures...

7/22/2011.....104/84...94.0...

8/07/1918.....104/83...93.5

7/15/1995.....102/84...93.0

8/09/2001.....103/82...92.5

7/06/2010.....103/81...92.0...

7/21/1980.....102/82...92.0

7/06/1999.....101/83...92.0

7/09/1936.....106/77...91.5

7/04/1999.....101/82...91.5

7/23/2011.....100/83...91.5

Impressive that the city managed to get to 106 after only starting at 77. 

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4 minutes ago, uncle W said:

NYC's hottest mean temperatures...

7/22/2011.....104/84...94.0...

8/07/1918.....104/83...93.5

7/15/1995.....102/84...93.0

8/09/2001.....103/82...92.5

7/06/2010.....103/81...92.0...

7/21/1980.....102/82...92.0

7/06/1999.....101/83...92.0

7/09/1936.....106/77...91.5

7/04/1999.....101/82...91.5

7/23/2011.....100/83...91.5

My station had the exact same hi and low on 7/22/2011.

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