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Summer's Over


WEATHER53

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My +2 forecast for June looks good and -1  for July and -2 for August still quite confident about.

You can see my summer outlook over in forecasting discussion in Isotherm's winter forecast thread.

Went for 30-35 90+, increased tropical activity, and around average rainfall.

The dominant temperature scheme from here on out is going to be mid to upper 80's for highs and some occassional 90-95 wont be able to put DC into plus values.  Lots of nightime lows in 60's.

The influx of -10 values this weekend will obviously not be a common occurrence the rest of the way but it is indicative of what lies ahead.

 

Some of the winter pieces have shown themselves and so far so good.

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I'll challenge you on this one. Once the IO subsidence ends, the +PNA ridge should retrograde into the GOA/Aleutian domain, and the SE ridge will probably return. I'm thinking this occurs between July 5th and July 10th. If anything, I suspect July will turn out warmer than average regionwide.

Analogous to what we'd expect under a degrading MJO and developing CCKW/high frequency forcing regime, the EPS, NAEFS, bias-corrected GEFS, and GGEM ensembles all retrograde the western ridge into the GOA and bring bring back the heat/SE ridge between the 4th and the 7th of July.

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My +2 forecast for June looks good and -1  for July and -2 for August still quite confident about.

You can see my summer outlook over in forecasting discussion in Isotherm's winter forecast thread.

Went for 30-35 90+, increased tropical activity, and around average rainfall.

The dominant temperature scheme from here on out is going to be mid to upper 80's for highs and some occassional 90-95 wont be able to put DC into plus values.  Lots of nightime lows in 60's.

The influx of -10 values this weekend will obviously not be a common occurrence the rest of the way but it is indicative of what lies ahead.

 

Some of the winter pieces have shown themselves and so far so good.

 

I realize that it could be a lot worse, but that sure as heck sounds like summer to me.

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Thats funny, I was just thinking July might end up warmer relative to average than June was.

The low-frequency WPAC forcing & coinciding IO subsidence responsible for the eastern troughing is now progressing, and higher frequency forcing should be entering the IO during the 2nd week of July. Analogs point to a strong SE ridge in such a forcing regimen.

See below..notice the forcing reversal in the off-equatorial WPAC..that dateline subsidence correlates strongly to eastern ridging:

2RwmGP.jpg

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  • 2 weeks later...

I would say DC area has been experiencing a less hot than typical summer. The skewed nightime mins have held temps into + territory but since I created this thread there have only been 3 90+ days with about 13/14 daytime highs at or below average. Once again a projected streak of 90+ is forecasted starting Saturday but I think by the time it gets here it will be more mid to upper 80's and some of these upper 70's low 80's for July highs is unusual.

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  • 2 weeks later...

Since I wrote this over a month ago there have been 6 90+ days at DCA, 4 92 or lower. One genuine 2 day heat streak. DCA nightime mins have caused the + values, most stations right around average so pretty much a benign run since the thread started.

Since when does a warmer-than-average July constitute the end of summer? It looks like we're back into a +2 to +4 pattern starting Sunday/Monday, which should allow the month to finish warmer than average region wide.

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